---

Interventions for Physiologic Impairments During Rehabilitation

IMPAIRED MUSCLE PERFORMANCE - Study Notes

---

1. Definitions and Key Concepts

• Strength - the ability to produce force (torque) against resistance
• Power - the rate of force production (force x velocity)
• Endurance - the ability to sustain repeated contractions over time

---

2. Types of Muscle Contraction Used in Rehabilitation

---

3. Isometric Exercise

• Foundational exercise - often precedes dynamic training
• Used to pre-tension muscles before eccentric contractions
• Preferred when joint motion is painful or contraindicated (e.g., post-op, unstable joint)
• Essential to prevent strength loss during immobilization
• Combined with dynamic exercise to address a "sticking point" in the ROM
• Muscle re-education after nerve injury
• Core stabilization programs

---

4. Resistance Training Principles

The Overload Principle (foundational)

Dose-Response for Strength Gains

• Strength increases approximately 30% in the first 6-8 weeks of a resistive training program in previously untrained individuals
• Gains plateau after ~10 weeks at a given loading stimulus - load must be progressively increased (progressive overload)
• In elderly sedentary individuals, where severe atrophy has occurred, strength gains exceeding 100% are achievable

ACSM Sequencing Recommendations (for general population)

• Large muscle groups before small
• Multi-joint exercises before single-joint exercises
• Alternate upper body and lower body when training all major muscle groups in one session
• When training upper/lower on separate days, order within each session follows the same large-before-small principle

Rehabilitation Sequencing (injured patient)

• Single-joint (isolated) exercises first, before fatigue sets in - this is reversed from the general population recommendation
• Follow isolated exercises with multi-joint functional movement patterns
• Unstacking exercises (alternating between different muscle groups) is preferred in early rehabilitation to allow active rest and prevent overwork
• As rehabilitation progresses, stacking (sequential exercises for the same muscle group) can be introduced

---

5. Muscle Hypertrophy

1. Increased number of myofibrils proportionate to hypertrophy
2. Up to 120% increase in mitochondrial enzymes
3. 60-80% increase in phosphagen metabolic system components (ATP, phosphocreatine)
4. Up to 50% increase in stored glycogen
5. 75-100% increase in stored triglyceride (fat)
6. Overall increase in maximum oxidation rate and efficiency of the oxidative metabolic system by ~45%

• Guyton & Hall Textbook of Medical Physiology

---

6. Fast-Twitch vs. Slow-Twitch Fiber Considerations

---

7. Eccentric Training

• A common mechanism of muscle strain injury (therefore must be trained to prevent injury)
• Associated with greater force production per unit of cross-sectional area than concentric
• The basis for tendinopathy protocols (e.g., Alfredson protocol for Achilles tendinopathy)
• Effective at producing hypertrophy, including in weakened/atrophied muscle

• Dynamic resistive exercises with strong eccentric loading
• Flexibility exercises
• Appropriate warm-up before activity
• Attention to fatigue levels

---

8. Positional Strengthening and Length-Tension Considerations

• Positionally weak muscle (e.g., chronically lengthened/inhibited): strengthen in the shortened range
• Globally weak muscle: strengthen dynamically throughout the full range
• The goal is restoring the muscle's ability to generate force at the appropriate point in the ROM for function - Brody's Therapeutic Exercise (Lippincott)

---

9. Muscle Imbalance and Therapeutic Targeting

1. Disuse atrophy - rapid losses begin within 24-48 hours of immobilization; predominantly affects Type II fibers initially
2. Neurologic inhibition - pain, effusion, and swelling reflexively inhibit local muscles (e.g., quadriceps inhibition with knee effusion)
3. Overuse/muscle imbalance - overactive muscles become shortened and inhibit their antagonists; underused muscles weaken
4. Inflammatory myopathy - acquired metabolic disturbance contributes directly to impaired muscle performance via immune-mediated fiber damage

• Identify and strengthen underused muscles to reduce overuse demands on susceptible muscles
• Restore muscle balance around joints before advancing to high-load functional training

---

10. Modalities and Adjuncts for Muscle Performance

---

11. Stages of Motor Control (Framework for Exercise Progression)

1. Mobility - achieve basic ROM and initiate muscle activation (isometric, AROM)
2. Stability - co-contraction to stabilize the joint; static weight-bearing
3. Controlled mobility - proximal movement on a fixed distal segment; dynamic stability
4. Skill - high-speed, coordinated, task-specific movements

---

12. Rehabilitation vs. Fitness Programming

• Sustain and build on rehabilitation gains
• Prevent injury recurrence through continued eccentric loading, flexibility, and appropriate progression

---

13. Special Populations

• Elderly/sarcopenic patients: Significant muscle atrophy from inactivity may respond with >100% strength gains from resistance training. Resistance exercise is the primary intervention for sarcopenia.
• Neurologic patients (stroke, SCI): Progressive resistance exercises, virtual reality, aquatic exercise, elastic bands - no evidence that strengthening induces spasticity. NMES and FES are adjuncts.
• Inflammatory/rheumatic disease: Exercise reduces pro-inflammatory cytokines (IL-6, TNF-α), promotes IL-10; aerobic and resistance exercise are both effective and safe during remission.
• Post-COVID/critical illness: Patients with muscle weakness from prolonged hospitalization require rehabilitation, though optimal protocols are still being defined.

---

14. Quick Reference: Training Variables

---

Summary

• Early phase: Isometrics, NMES, neuromuscular re-education, aquatic exercise, low-load isotonics
• Middle phase: Progressive resistance exercise, eccentric loading introduced, functional movements, muscle balance restoration
• Late phase: High-load/power training, sport-specific or task-specific movements, eccentric emphasis, prevention program
• Transition: Fitness program with ACSM-based progressive overload, eccentric components, and continued attention to flexibility and fatigue management

---

---

Interventions for Physiologic Impairments During Rehabilitation

IMPAIRED ENDURANCE - Exam Notes

---

LEVEL 1 - THE BASICS (Start Here)

What is Endurance?

• Cardiorespiratory (aerobic) endurance - the ability of the heart, lungs, and circulation to deliver oxygen to working muscles during prolonged activity
• Local muscular endurance - the ability of a specific muscle group to perform repeated contractions without fatigue

What is Impaired Endurance?

• Prolonged bed rest / immobilization
• Cardiac or respiratory disease
• Post-surgical deconditioning
• Neurologic or musculoskeletal conditions
• Inflammatory disease (e.g., rheumatoid arthritis, myopathies)

---

LEVEL 2 - KEY CONCEPT: VO₂max

• It represents the maximum rate at which the body can consume oxygen during maximal exercise
• Normal: ~38 mL/kg/min in active healthy men; ~29 mL/kg/min in active healthy women
• Exercise training increases VO₂max - this is the primary goal of endurance rehabilitation
• A 1-MET increase in exercise capacity after cardiac rehabilitation = 13% reduction in mortality risk; in low-fitness patients, this rises to 30% reduction
• Fuster and Hurst's The Heart, 15th Ed.

MET Levels - Simple Reference

• Goldman-Cecil Medicine

---

LEVEL 3 - THE FITT-VP PRINCIPLE (Exercise Prescription Framework)

---

LEVEL 4 - MODES OF AEROBIC EXERCISE

---

LEVEL 5 - TWO MAIN TRAINING APPROACHES

A. Continuous Endurance Training (CET)

• Patient exercises at a constant, moderate intensity for the entire session
• Example: Walk at 3.4 mph for 30 minutes
• Best for: Most rehabilitation populations; easy to teach and monitor
• Builds: Aerobic base, cardiovascular efficiency, walking endurance

B. Interval Training

• Alternating periods of high-intensity exercise with rest or low-intensity activity
• Work:Relief ratios vary by goal:

• A longer work interval (≥3 minutes) trains the aerobic system - requires shorter recovery
• A shorter, high-intensity bout trains the phosphagen/anaerobic system - requires much longer recovery
• Relief interval can be passive (rest) or active (light activity, stretching)
• Brody's Therapeutic Exercise (Lippincott)

---

LEVEL 6 - HIGH-INTENSITY INTERVAL TRAINING (HIIT)

Why HIIT Matters in Rehabilitation:

• More effective than moderate-intensity continuous training for improving cardiorespiratory fitness
• Completely eliminates non-responders to exercise training when performed at high volume + high intensity (a key finding: low volume/low intensity exercise still leaves ~40% non-responders)
• Safe in patients with cardiovascular disease when properly supervised
• In COPD: periods of high-intensity exercise (20-30 sec) alternated with low-intensity or rest (30-40 sec) produces comparable gains to continuous training - ideal for patients who cannot sustain continuous exertion
• In cardiac rehabilitation: HIIT produces greater improvement in VO₂peak than moderate continuous exercise
• Fuster and Hurst's The Heart, 15th Ed.; Murray & Nadel's Respiratory Medicine

HIIT Protocol Example:

4 x 4 minutes at 85-95% max HR, with 3-minute active recovery at 50-70% max HR between bouts (the "Norwegian" HIIT protocol used in cardiac rehab)

---

LEVEL 7 - MONITORING EXERCISE INTENSITY

1. Heart Rate Methods

• Target Heart Rate (THR) = most common clinical method
• Karvonen Formula: THR = Resting HR + (Intensity% × Heart Rate Reserve)
  • HRR = Max HR - Resting HR
• Max HR estimate: 220 - age (simple) OR 208 - (0.7 × age) (more accurate)

2. Rating of Perceived Exertion (RPE) - Borg Scale

• RPE 12-16 = the usual target zone for rehabilitation endurance training
• RPE may be affected by psychological state, medications (especially beta-blockers), and unfamiliarity with exercise equipment

3. METs

• Prescribe activity within a target MET range based on the patient's baseline functional capacity (e.g., start at 3-4 METs if patient tolerates 5 METs on initial testing)

4. Talk Test

• Simple: Patient should be able to speak in short sentences but not carry on a full conversation = appropriate moderate intensity

5. 6-Minute Walk Test (6MWT)

• Safe, low-cost field test used to both assess baseline and prescribe exercise intensity
• Target HR at end of 6MWT is used to set training heart rate in cardiac and pulmonary rehab
• Murray & Nadel's Respiratory Medicine

---

LEVEL 8 - PHYSIOLOGIC ADAPTATIONS TO ENDURANCE TRAINING

• Increased stroke volume (cardiac hypertrophy - "athlete's heart")
• Decreased resting heart rate (vagal dominance)
• Increased cardiac output during maximal exercise
• Improved coronary blood flow

• Increased mitochondrial density and oxidative enzyme activity (+45% in aerobic metabolic system efficiency)
• Increased capillary density in skeletal muscle
• Improved oxygen extraction (wider arteriovenous O₂ difference)
• Shift toward fat as fuel (sparing glycogen)
• Increased stored glycogen and triglycerides in muscle

• Guyton & Hall Medical Physiology; Medical Physiology (Boron & Boulpaep)

---

LEVEL 9 - SPECIAL CONSIDERATIONS IN REHABILITATION

COPD / Pulmonary Rehabilitation

• Endurance training is the cornerstone of pulmonary rehabilitation
• Target intensity: 60-80% of maximal workload for greatest gains
• Low-intensity exercise (<50% max) still provides benefit in severely limited patients
• Walking-based training improves walking endurance more than cycling
• Cycling preferred when there is significant oxygen desaturation with walking
• One-legged cycling (single-leg): trains smaller muscle group → allows higher intensity, less ventilatory demand → greater VO₂ gains
• Interval training is the preferred alternative when patients cannot tolerate continuous exercise
• Optimize bronchodilators before exercise to allow higher training intensities
• Supplemental O₂ during exercise for hypoxemic patients improves endurance and allows higher training loads
• Murray & Nadel's Textbook of Respiratory Medicine

Cardiac Rehabilitation

• Each 1-MET increase = 13% reduction in mortality; up to 30% in low-fitness patients
• High volume + high intensity training eliminates exercise non-responders
• HIIT is more effective than moderate continuous training for improving VO₂peak
• Heart failure patients benefit from gradual volume increase + aerobic + resistance combination
• Fuster and Hurst's The Heart

Musculoskeletal / Arthritis / Post-Surgical

• Aquatic exercise in early stages when weight-bearing is limited
• Transition to land-based exercise as pain and function improve (land exercise improves aerobic capacity and pain more than aquatic long-term)
• Combine aerobic + resistance training for optimal outcomes
• Goldman-Cecil Medicine

Inflammatory Myopathies (PM/DM)

• Endurance exercise improves cycling time and aerobic capacity
• Reverses tissue hypoxia caused by microvascular involvement
• Rheumatology 2-Volume Set (Elsevier)

---

LEVEL 10 - CIRCUIT TRAINING (Advanced Design)

• Stations rotate through muscle groups, allowing active rest
• Develops both local muscular endurance and cardiorespiratory endurance simultaneously
• Rest interval between stations: ~30 seconds (for muscle endurance goal)
• Highly time-efficient; good for late-stage rehabilitation and transition to wellness

• Prevent plateaus
• Maintain patient interest
• Provide a balanced program
• Brody's Therapeutic Exercise (Lippincott)

---

QUICK SUMMARY TABLE - Simple to Complex Progression

---

EXAM QUICK POINTS TO REMEMBER

1. VO₂max = gold standard of aerobic capacity; training increases it
2. FITT-VP: Frequency, Intensity, Time, Type, Volume, Progression
3. Increase duration before intensity when progressing
4. HIIT > moderate continuous training for VO₂max improvement; safe in CVD with supervision
5. Interval training is preferred for patients who cannot sustain continuous exertion (COPD, severe deconditioning)
6. Aerobic work interval ≥3 minutes = trains aerobic system; short, all-out bursts = phosphagen system
7. Walking > cycling for walking endurance; cycling > walking for minimizing O₂ desaturation in COPD
8. 1-MET gain = 13% mortality reduction in cardiac rehab patients
9. RPE 12-16 (Borg scale) = appropriate rehabilitation exercise intensity
10. Non-responders to exercise training are eliminated by high volume + high intensity training

---

---

PHYSIOTHERAPY INTERVENTIONS IN MUSCULOSKELETAL DISORDERS

Interventions for Physiologic Impairments During Rehabilitation

IMPAIRED MOBILITY - Complete Notes

---

1. DEFINITION

---

2. TYPES OF MOBILITY

---

3. CAUSES OF IMPAIRED MOBILITY

A. Articular (Joint) Causes

• Osteoarthritis - osteophytes, cartilage loss, joint space narrowing
• Rheumatoid arthritis - synovitis, joint effusion, subluxation
• Post-fracture stiffness
• Septic arthritis (post-infection)
• Adhesive capsulitis (frozen shoulder)

B. Soft Tissue Causes

• Muscle contracture (shortening of muscle-tendon unit)
• Fascial tightness
• Scar tissue / fibrosis (post-surgical, post-burn)
• Prolonged immobilization - leads to adaptive shortening of collagen
• Spasticity (neurological - UMN lesions)
• Edema restricting movement

C. Neurological Causes

• Spasticity (stroke, SCI, cerebral palsy)
• Rigidity (Parkinson's disease)
• Peripheral nerve injury causing muscle imbalance

D. Bony Causes

• Heterotopic ossification
• Osteophytes
• Fracture malunion

E. Pain-Related

• Reflexive inhibition of movement due to pain
• Fear-avoidance behavior (kinesiophobia)

---

4. ASSESSMENT OF MOBILITY

Range of Motion (ROM) - Key Concepts

"Both active and passive range of motion should be assessed to appreciate joint function. Active ROM requires intact strength, innervation, muscle and tendon function, and joint mobility. Passive ROM is assessed by determining joint mobility." - Goldman-Cecil Medicine

End-Feel

Measurement Tool

---

5. INTERVENTIONS FOR IMPAIRED MOBILITY

---

LEVEL 1 - POSITIONING AND EARLY MOBILIZATION

• Maintaining joints in positions that prevent adaptive shortening
• Preventing contracture formation during immobilization
• Distributing pressure and maintaining tissue circulation

• Lying prone to prevent hip flexion contracture after burns/amputation
• Positioning knee in extension after surgery
• Elevating limbs to reduce edema (edema restricts mobility)

"Active and active-assisted exercises for joint mobilization should be started as soon as soft-tissue healing permits." - Campbell's Operative Orthopaedics

• Begin ROM exercises as early as safely possible post-injury or post-surgery
• Controlled motion during healing stimulates collagen alignment and prevents adhesion formation

---

LEVEL 2 - RANGE OF MOTION (ROM) EXERCISES

A. Passive ROM (PROM)

• Therapist moves the joint; patient is completely relaxed
• Used when: Patient cannot move the limb (paralysis, severe pain, post-op immobilization)
• Goals: Prevent contracture, maintain joint nutrition, reduce edema, preserve tissue extensibility
• Does NOT maintain or build strength - only maintains joint mobility
• Frequency: Several times daily for immobile patients

B. Active-Assisted ROM (AAROM)

• Patient contributes as much movement as possible; therapist assists the remainder
• Used when: Patient has partial voluntary control (weak muscle 2/5-3/5 on MMT)
• Goals: Maintain ROM + begin neuromuscular re-education + prevent disuse atrophy
• Bridges the gap between passive and full active exercise

C. Active ROM (AROM)

• Patient moves the joint through full range under their own power
• Used when: Patient has adequate strength (muscle grade ≥3/5)
• Goals: Maintain/improve ROM, strengthen muscles, improve neuromuscular coordination
• Most beneficial for preventing and treating stiffness

D. Continuous Passive Motion (CPM)

• Machine moves the joint continuously through a set range
• Used post-operatively (especially total knee arthroplasty)
• Promotes joint cartilage healing, reduces effusion, prevents adhesions
• Does not replace active exercise

---

LEVEL 3 - STRETCHING TECHNIQUES

Types of Stretching

Proprioceptive Neuromuscular Facilitation (PNF) Stretching

1. Contract-Relax (CR)
   • Patient contracts the tight muscle isometrically against therapist resistance for ~6 seconds
   • Then relaxes - therapist moves limb to new range
   • Mechanism: Post-isometric relaxation (Golgi tendon organ inhibition)
2. Agonist Contract (AC)
   • Patient actively contracts the antagonist (opposite muscle) while therapist stretches the tight muscle
   • Mechanism: Reciprocal inhibition - contracting the agonist reflexively inhibits the tight muscle
3. Contract-Relax-Agonist-Contract (CRAC)
   • Combines both techniques above
   • Most effective PNF technique for gaining ROM
   • Contract (tight muscle) → Relax → Contract antagonist → new range achieved

Principles of Effective Stretching

• Stretch should be applied after warm-up (increased tissue temperature improves extensibility)
• Apply force slowly and progressively - avoid rapid, forceful stretch (activates stretch reflex)
• Hold static stretch for minimum 15-30 seconds; up to 60 seconds for tight structures
• Stretch to the point of tissue resistance, not pain
• Repeat 3-5 times per session
• Consistent daily stretching produces lasting increases in ROM

---

LEVEL 4 - JOINT MOBILIZATION (Manual Therapy)

Maitland Grades of Joint Mobilization

• Grades I & II → when pain is the primary complaint (pre-tissue resistance)
• Grades III & IV → when stiffness is the primary complaint (into tissue resistance)
• Grade V → high velocity low amplitude thrust; used when grades I-IV insufficient; not used in acute inflammatory states

"Low-velocity, repetitive passive motions with varying amplitudes make up oscillatory joint mobilization methods. Grades III & IV are mostly employed as stretching exercises; Grades I and II are generally utilized to treat joints limited by pain." - PMC11344476

Mulligan Mobilization (Mobilization with Movement - MWM)

• Accessory glide applied by therapist while patient performs active movement simultaneously
• Corrects "positional fault" in the joint
• Used for: Tennis elbow, knee pain, ankle sprains, cervical and lumbar dysfunction
• Key principle: The mobilization must abolish or reduce pain during active movement to be appropriate
• Example: Lateral glide at elbow while patient grips (for lateral epicondylalgia)

Kaltenborn Grades

---

LEVEL 5 - MANIPULATION (High Velocity Low Amplitude Thrust - HVLAT)

• Passive movement applied at high velocity, small amplitude beyond the patient's control
• Produces an audible "crack" (cavitation in the joint)
• Indication: Hypomobile joints, joint locking, segmental spinal restrictions
• Contraindications: Osteoporosis, fracture, tumor, acute inflammation, infection, hypermobility, arterial insufficiency (vertebral artery - for cervical manipulation), anticoagulation

---

LEVEL 6 - SPLINTING AND ORTHOTIC DEVICES

"Static stretching with splints probably will not prevent contractures when motor control is absent. Serial casting can reduce stretch-related spasticity." - Bradley and Daroff's Neurology in Clinical Practice

---

LEVEL 7 - TRACTION

• Separate joint surfaces (reduce compressive forces)
• Elongate capsular and periarticular structures
• Reduce nerve root compression (spinal traction)

---

LEVEL 8 - PHYSICAL AGENTS (Adjuncts to Increase Mobility)

"Stiffness is relieved by warmth and activity, and reducing or eliminating joint stiffness is a clear goal of therapy." - Goldman-Cecil Medicine

---

LEVEL 9 - SURGICAL INTERVENTIONS (When Conservative Fails)

---

6. PROGRESSION OF MOBILITY INTERVENTIONS

EARLY PHASE          →    MID PHASE          →    LATE PHASE
Positioning               AAROM                   Full AROM
PROM                      Static stretching        PNF stretching
CPM                       Grade I-II mobilization  Grade III-IV mobilization
Heat + passive stretch    Dynamic stretching       Functional mobility training
Edema management          Serial casting/splinting  Task-specific movement

---

7. CONTRAINDICATIONS TO STRETCHING AND MOBILIZATION

---

8. QUICK EXAM SUMMARY TABLE

---

KEY EXAM POINTS

1. AROM = PROM deficit → joint/structural problem; AROM < PROM → muscle/neuromuscular problem
2. End-feel is assessed during PROM and directs diagnosis
3. PNF > static stretch for ROM gains; CRAC is the most effective PNF technique
4. Maitland Grades I & II = pain; Grades III & IV = stiffness; Grade V = manipulation (HVLAT)
5. Low-load prolonged stretch (splinting/serial casting) > high-load brief stretch for permanent ROM gains
6. Heat before stretch, cold after exercise
7. Mulligan MWM: accessory glide + active movement; must reduce pain to be valid
8. Contraindicate all mobilization in active infection, fracture, malignancy, instability
9. Early mobilization post-surgery/injury promotes collagen alignment, prevents adhesion
10. PROM alone does not build strength - only active exercise maintains muscle

---

---

Interventions for Physiologic Impairments During Rehabilitation

IMPAIRED NEUROMUSCULAR CONTROL - Complete Notes

---

1. DEFINITION

• Sensory input (from mechanoreceptors, vestibular system, vision)
• Central processing (spinal cord, cerebellum, cerebral cortex)
• Motor output (muscle activation - both preparatory and reactive)

"Simply restoring mechanical restraints or strengthening the associated muscles neglects the smooth coordinated neuromuscular controlling mechanisms required for joint stability." - Brody's Therapeutic Exercise (Lippincott)

---

2. KEY COMPONENTS OF NEUROMUSCULAR CONTROL

"Proprioception is a precursor of good balance and adequate function. Balance is the process by which we control the body's center of mass with respect to the base of support." - Brody's Therapeutic Exercise

---

3. SENSORY SOURCES OF PROPRIOCEPTION

A. Peripheral Mechanoreceptors

• Stretch reflex: Muscle spindle senses sudden lengthening → Ia fiber → monosynaptic α-motor neuron activation → muscle contracts (protective)
• GTO reflex (autogenic inhibition): Excessive tension → Ib fiber → inhibits agonist, facilitates antagonist (protective against overload)
• Reciprocal inhibition: Contraction of agonist inhibits antagonist via Ia interneurons

B. Vestibular System

• Detects head position and acceleration
• Critical for balance, especially when vision and proprioception are compromised

C. Visual System

• Provides external reference for body position in space
• Compensates when proprioception is impaired (dominant in early rehabilitation)

---

4. LEVELS OF MOTOR CONTROL (CNS Processing)

1. Feedforward (anticipatory / preparatory): CNS pre-activates muscles before a predicted perturbation - requires prior learning/experience
2. Feedback (reactive): Muscles respond after a perturbation has occurred - depends on speed of reflex arcs

---

5. CAUSES OF IMPAIRED NEUROMUSCULAR CONTROL

• Ligament / joint injury - damage to mechanoreceptors in capsule/ligament (e.g., ACL tear, ankle sprain)
• Muscle injury - disruption of muscle spindle function
• Pain - reflexive inhibition of motor output; altered movement patterns
• Immobilization - leads to deafferentation and loss of central motor programming
• Neurological injury - stroke, SCI, peripheral neuropathy, cerebellar lesions
• Aging - progressive decline in mechanoreceptor density and central processing speed
• Surgery - disruption of articular structures and their innervation
• Chronic joint disease - e.g., osteoarthritis reduces receptor density

"Motor agility actually begins to decline in early adult life, even by the 30th year; it seems related to a gradual decrease in neuromuscular control as well as to changes in joints and other structures." - Adams and Victor's Principles of Neurology, 12th Ed.

---

6. ASSESSMENT OF NEUROMUSCULAR CONTROL

---

7. INTERVENTIONS - FROM SIMPLE TO COMPLEX

Slow → Fast | Low force → High force | Controlled → Uncontrolled | Simple coordination → Complex coordination | Bilateral → Unilateral | Eyes open → Eyes closed | Stable surface → Unstable surface

---

PHASE 1 - PROPRIOCEPTIVE RETRAINING (Sensory Re-education)

• Joint repositioning exercises: Patient moves joint to a target angle and holds; then reproduces it with eyes closed
• Active movement awareness: Slow, controlled AROM with attention to sensation of movement
• Tactile and vibration stimulation: Stimulating skin and joint surfaces to heighten afferent input
• Texture walking: Walking on different surfaces (carpet, grass, gravel) to stimulate plantar mechanoreceptors
• Mirror therapy / visual feedback: Used in neurological rehab (stroke) to re-establish body image

---

PHASE 2 - STATIC STABILIZATION (Level 1 Neuromuscular Control)

• Double-leg standing on stable surface (basic weight-bearing)
• Double-leg standing on foam pad/balance board
• Single-leg stance on stable surface, eyes open
• Single-leg stance on foam pad, eyes closed
• Single-leg stance with arm movements (dual-task challenge)
• Mini-squat holds on unstable surface

• BAPS (Biomechanical Ankle Platform System)
• Foam rolls / foam pads
• BOSU ball
• Wobble board / balance board
• Trampoline

"The cornerstone of rehabilitation during this phase is postural stability training. The 3 variables of balance that are manipulated include bilateral to unilateral stance, eyes open to eyes closed, and stable to unstable surfaces." - Brody's Therapeutic Exercise

---

PHASE 3 - DYNAMIC STABILIZATION (Level 2 Neuromuscular Control)

• Weight shifts: Side-to-side and fore-aft weight shifting in stance
• Step-ups and step-downs: Single-leg loading with controlled descent
• Lateral band walks: Peroneal and hip abductor activation with proprioceptive challenge
• Lateral slides: Weight transfer on a sliding board
• Mini-trampoline balance: Bilateral and unilateral standing with controlled bounce
• Ball catching/throwing in single-leg stance: Adds cognitive + upper limb challenge

• Introduce visual challenges (tracking a moving object while balancing)
• Introduce cognitive dual-tasking (naming colors, counting backwards)
• Introduce arm and trunk perturbations while maintaining lower extremity stability

---

PHASE 4 - REACTIVE NEUROMUSCULAR TRAINING (RNT)

1. Stimulate peripheral and central mechanoreceptors via exaggerated sensory input
2. Encourage preparatory agonist-antagonist co-contraction (restores force couples, increases joint congruency)
3. Minimize verbal/visual instruction from therapist - the response must be automatic, not conscious

Slow-speed → Fast-speed | Low-force → High-force | Controlled perturbation → Uncontrolled perturbation | Static balance reaction → Dynamic movement pattern

---

PHASE 5 - COORDINATION AND MOTOR SKILL TRAINING

• Proprioceptive Neuromuscular Facilitation (PNF) patterns: Diagonal movement patterns (D1, D2 flexion/extension) that engage multiple joints simultaneously in coordinated patterns
• Ball drills: Passing, catching, bouncing - require precise timing and coordination
• Ladder drills: Foot placement accuracy at increasing speeds
• Stepping and shuffling patterns: Side shuffle, crossover, carioca
• Cone drills: Change of direction tasks

• Upper extremity D1: Flexion (shoulder flexion, adduction, external rotation + elbow flexion + forearm supination)
• Upper extremity D2: Extension (shoulder extension, abduction, internal rotation)
• These diagonal patterns activate muscles in coordinated synergistic patterns that replicate functional movement

---

PHASE 6 - PLYOMETRIC TRAINING

• Rapid eccentric loading → muscle spindle stretch reflex → amplified concentric force
• Desensitizes GTO (raises force threshold before inhibition) → allows muscles to generate greater force
• Trains neuromuscular coordination - makes movements more automatic (motor pattern reinforcement)
• Reduces ACL injury risk by increasing neuromuscular control in all three planes and redistributing force to muscles/tendons away from ligaments

• Quadriceps strength ≥65% of contralateral limb (for lower extremity)
• No effusion / full ROM
• Stable joint
• Adequate static and dynamic balance

---

PHASE 7 - AGILITY AND SPORT/FUNCTION-SPECIFIC TRAINING

• Carioca (crossover stepping)
• 45° and 90° cutting drills
• Figure-of-8 running
• Lateral shuffles
• Deceleration training
• Sport-specific drills (returning athlete) or ADL-specific tasks (returning patient)

---

8. ADJUNCT INTERVENTIONS

---

9. NEUROMUSCULAR CONTROL IN SPECIFIC CONDITIONS

Ankle Sprain

• Damage to ATFL/CFL disrupts mechanoreceptors in the lateral ligaments
• Rehabilitate: BAPS board, single-leg stance, lateral band walks, perturbation training, bracing
• Neuromuscular training + functional bracing reduces re-injury rate better than either alone
• Proprioceptive training reduces recurrence by approximately 50%

ACL Injury / Reconstruction

• ACL contains abundant mechanoreceptors (Ruffini, Pacinian, free nerve endings)
• ACL rupture causes significant deafferentation
• Progression: Closed kinetic chain proprioception → dynamic stabilization → plyometrics → agility
• Neuromuscular training programs reduce first-time non-contact ACL injury rates by 50-51%

Patellofemoral Syndrome

• VMO activation timing is delayed
• EMG biofeedback to facilitate VMO; step-down training; single-leg squats with feedback

Shoulder Instability

• Rotator cuff provides dynamic stabilization via mechanoreceptor input + co-contraction
• Rehabilitation: Shoulder proprioception exercises → rhythmic stabilization → dynamic stabilization on unstable surfaces → sport-specific overhead loading
• Progress: Bilateral supported → unilateral unsupported; minimal capsular stress → maximal capsular stress

Stroke / Neurological Rehab

• Impaired central processing; altered motor programs
• Mirror therapy, constraint-induced movement therapy (CIMT), bimanual training
• Bimanual training: in-phase movements of intact arm may facilitate interlimb coordination to improve paretic arm via bilateral motor control substrates

Aging / Fall Prevention

• Multicomponent programs (balance training + muscle strengthening) reduce falls by up to 40%
• Balance training at least 3 days/week in evidence-based fall prevention programs
• Tai Chi is highly effective in elderly

---

10. COMPLETE PROGRESSION SUMMARY

PHASE 1 → PHASE 2 → PHASE 3 → PHASE 4 → PHASE 5 → PHASE 6 → PHASE 7

Sensory      Static       Dynamic      Reactive    Coordination  Plyometric   Agility /
Re-education Stabilization Stabilization NMT (RNT)  & PNF        Training     Sport-specific

JPS drills   Bilateral     Weight       Perturbation PNF diagonals Low jumps    Cutting drills
Slow AROM    → Unilateral  shifts       training     Ladder drills Box jumps    Carioca
Texture walk Eyes open     Step-ups     Band         Ball drills   Depth jumps  Figure-of-8
             → Closed      Lateral walk resistance   Cone drills   Single-leg   Return to
             Stable →      Balance      Medicine     Shuffling     hops         sport/function
             Unstable      board drills ball drills

---

11. EXAM QUICK POINTS

1. Neuromuscular control = sensory input + CNS processing + motor output (all three must be intact)
2. Proprioception = joint position sense + kinesthesia; impaired after any joint injury
3. Muscle spindle detects muscle length/change; GTO detects tension
4. Feedforward = preparatory (anticipatory); Feedback = reactive (after perturbation)
5. Three variables of balance training: Bilateral→Unilateral, Eyes open→Closed, Stable→Unstable surface
6. RNT (Reactive Neuromuscular Training) = external perturbation forces automatic, unconscious stabilization response
7. Plyometrics train the stretch-shortening cycle; require ≥65% quadriceps strength as prerequisite
8. PNF diagonal patterns train multi-joint coordinated movement in physiological planes
9. ACL injury causes deafferentation → neuromuscular retraining is mandatory after reconstruction
10. Biofeedback re-educates inhibited muscles (VMO, gluteus medius); NMES for denervated or severely inhibited muscle
11. Falls prevention = balance training ≥3 days/week + muscle strengthening; reduces falls by 40%
12. Unstable surfaces maximize afferent input, enhance spinal-level co-contraction
13. Progression is always: Simple → Complex | Slow → Fast | Controlled → Uncontrolled

---

---

Pharmacological Management of Pain

(Opioids | Non-Opioids | Adjuvants | Local Anesthetics)

+ Recent Evidence for Physiotherapy

---

FIRST - UNDERSTAND PAIN BRIEFLY

• Nociceptors → A-delta fibers (fast, sharp pain) and C-fibers (slow, burning pain) → Spinal cord (dorsal horn) → Brain

---

THE WHO ANALGESIC LADDER (Framework for all pain drugs)

STEP 3: Severe Pain
        Strong Opioids (Morphine, Oxycodone, Fentanyl)
        + Non-opioid ± Adjuvant

STEP 2: Moderate Pain
        Weak Opioids (Tramadol, Codeine)
        + Non-opioid ± Adjuvant

STEP 1: Mild Pain
        Non-Opioids (Paracetamol, NSAIDs)
        ± Adjuvant

---

PART 1 - NON-OPIOID ANALGESICS

What are they?

---

A. PARACETAMOL (Acetaminophen)

• Mild-moderate pain
• Safe for most patients
• Does NOT irritate stomach (unlike NSAIDs)
• Toxic in overdose → liver failure (max dose 4g/day in adults; 2g/day in elderly)

---

B. NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)

• COX-1 = "housekeeping" enzyme → protects stomach lining, helps platelets clot
• COX-2 = "inducible" enzyme → activated by inflammation
• Traditional NSAIDs block BOTH → more side effects
• Selective COX-2 inhibitors (e.g., celecoxib) → fewer GI side effects but higher cardiovascular risk

• GI: Ulcers, bleeding, nausea (COX-1 inhibition removes stomach protection)
• Kidney: Reduced blood flow → renal impairment (avoid in renal disease)
• Cardiovascular: Increased risk of MI/stroke (especially COX-2 inhibitors)
• Bleeding: Impaired platelet function (reversible with most NSAIDs except aspirin)

---

PART 2 - OPIOID ANALGESICS

What are they?

Opioid Receptors:

---

Classification of Opioids

Weak Opioids (Step 2)

Strong Opioids (Step 3)

---

Mechanism of Opioids (Simple)

---

Side Effects of Opioids (MUST KNOW)

---

Tolerance, Dependence, Addiction - Distinguish Clearly

"Physicians often mistakenly interchange tolerance, physical dependence, and addiction. These are distinct concepts." - Miller's Anesthesia

---

Opioid Reversal Agent

---

PART 3 - ADJUVANT ANALGESICS

What are they?

---

A. ANTIDEPRESSANTS

Tricyclic Antidepressants (TCAs)

• Examples: Amitriptyline, Nortriptyline
• Mechanism: Block reuptake of serotonin and norepinephrine in descending pain inhibitory pathways (gate control) + sodium channel blockade
• Dose for pain: Much lower than antidepressant dose (e.g., amitriptyline 10-75mg at night)
• Used for: Neuropathic pain, fibromyalgia, migraine prophylaxis, sleep in chronic pain
• Side effects: Sedation, dry mouth, constipation, urinary retention, cardiac arrhythmia (avoid in elderly)

SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors)

• Examples: Duloxetine, Venlafaxine
• Mechanism: Inhibit reuptake of serotonin + norepinephrine → strengthen descending pain inhibition
• Used for: Diabetic neuropathy, fibromyalgia, chronic low back pain, musculoskeletal pain
• Duloxetine is FDA-approved for diabetic peripheral neuropathy AND fibromyalgia
• EULAR recommends duloxetine for fibromyalgia

---

B. ANTICONVULSANTS (Gabapentinoids)

"Other effective adjuvant medications include pregabalin, which has the same mechanism as gabapentin but is absorbed more efficiently. Duloxetine, venlafaxine, nortriptyline, and amitriptyline are also beneficial." - Harrison's Principles of Internal Medicine 22E

---

C. CORTICOSTEROIDS

• Examples: Dexamethasone, Methylprednisolone, Triamcinolone
• Mechanism: Reduce inflammation by suppressing COX-2 and phospholipase A2 → decrease prostaglandins, leukotrienes, histamine
• Routes: Oral, IV, or local injection (intra-articular, peritendinous, epidural)
• Used for: Inflammatory arthritis flares, bursitis, tendinopathies, nerve root compression, cancer pain
• Side effects with long-term use: Osteoporosis, hyperglycemia, immunosuppression, adrenal suppression, Cushing's syndrome
• Local injection has fewer systemic side effects; used widely in MSK physiotherapy practice

---

D. MUSCLE RELAXANTS

• Examples: Cyclobenzaprine, Baclofen, Tizanidine, Methocarbamol
• Used for: Acute muscle spasm, spasticity (neurological)
• Long-term use: Systematic review (2024, PMID 39298168) found limited evidence for long-term use; associated with sedation and dependence risk

---

E. TOPICAL ANALGESICS

---

PART 4 - LOCAL ANESTHETICS

What are they?

---

Mechanism (MUST KNOW)

"The mechanism of action of local anesthetics is dose-dependent blockade of sodium currents in nerve fibers." - Sabiston Textbook of Surgery

1. Local anesthetic enters the nerve cell
2. Blocks voltage-gated Na⁺ channels (prevents Na⁺ influx)
3. No Na⁺ influx = No action potential
4. No action potential = No pain signal travels

• Pain (C and A-delta fibers) blocked first
• Touch and pressure next
• Motor fibers blocked last (larger, more myelinated)

---

Classification

By Chemical Structure:

By Duration:

---

Key Drugs in Detail

---

Routes of Local Anesthetic Use in MSK / Physio Context

---

Toxicity of Local Anesthetics

---

PART 5 - MULTIMODAL ANALGESIA

Paracetamol + NSAID/COX-2 inhibitor + Low-dose opioid (if needed) + Adjuvant (if neuropathic) + Local anesthetic (regional/topical)

"Multimodal analgesia includes using multiple analgesic classes targeting different mechanisms to reduce opioid requirements and side effects." - Miller's Anesthesia

---

PART 6 - RECENT EVIDENCE PERTAINING TO PHYSIOTHERAPY

---

1. Early Physiotherapy Reduces Opioid Use

---

2. Exercise as an Analgesic

• Exercise activates the body's endogenous opioid system (endorphins, enkephalins), endocannabinoid system, and serotonergic pathways
• Produces exercise-induced hypoalgesia (pain threshold increases after exercise)
• Systematic review (2024, PMID 39768944): Physical activity is effective for managing non-specific low back pain
• Exercise therapy vs manual therapy for chronic LBP (2025, PMID 40747709): Both effective for pain intensity and disability - supporting multimodal physiotherapy

---

3. Physiotherapy as a Non-Opioid Strategy (CDC & WHO Guidelines)

• Non-pharmacological approaches (exercise, manual therapy, cognitive-behavioral therapy) as FIRST-LINE for most chronic musculoskeletal pain
• Opioids should be considered only when non-pharmacological approaches and non-opioid pharmacotherapy have failed
• When opioids are prescribed, physiotherapy should run concurrently to allow opioid dose reduction

---

4. Opioid Deprescribing and Physio

• Reduce opioid dose gradually (10% per week) while increasing non-pharmacological support including physiotherapy
• Exercise programs and pain education should be integrated during tapering to maintain function

---

5. TENS as an Adjunct to Medications

---

6. Drugs That HELP Physiotherapy Work

---

QUICK SUMMARY TABLE (Exam Reference)

---

EXAM RAPID-FIRE POINTS

1. WHO ladder: Step 1 = Non-opioids → Step 2 = Weak opioids → Step 3 = Strong opioids
2. Paracetamol reduces pain + fever but NOT inflammation
3. NSAIDs reduce pain + fever + inflammation; risk = GI ulcers, renal failure
4. All opioids act on Mu receptor; naloxone reverses overdose
5. Tramadol = weak opioid + SNRI mechanism (dual action)
6. Respiratory depression = most dangerous opioid side effect; treated with naloxone
7. Constipation = most consistent opioid side effect (no tolerance develops)
8. Gabapentin/Pregabalin = block Ca²⁺ channels; reduce central sensitization; used for neuropathic pain
9. Duloxetine = SNRI; FDA-approved for diabetic neuropathy AND fibromyalgia
10. Local anesthetics = block Na⁺ channels; pain fibers blocked first, motor last
11. Bupivacaine = long-acting but cardiotoxic in IV overdose (use with caution)
12. Ester LAs metabolized in blood; Amide LAs metabolized in liver
13. Early physiotherapy reduces opioid use by 7-16% (Stanford/Duke study)
14. Exercise activates endogenous opioid system - it IS an analgesic
15. CDC 2022 guidelines: Non-pharmacological approaches (including PT) = FIRST LINE for chronic MSK pain

---

---

Pharmacological Management of Pain

(Opioids | Non-Opioids | Adjuvants | Local Anesthetics)

+ Recent Evidence Pertaining to Physiotherapy

---

FIRST - UNDERSTAND PAIN BRIEFLY

• Nociceptors → A-delta fibers (fast, sharp) and C-fibers (slow, burning) → Spinal cord (dorsal horn) → Brain

---

THE WHO ANALGESIC LADDER

STEP 3:  Severe Pain
         Strong Opioids (Morphine, Oxycodone, Fentanyl)
         + Non-opioid ± Adjuvant

STEP 2:  Moderate Pain
         Weak Opioids (Tramadol, Codeine)
         + Non-opioid ± Adjuvant

STEP 1:  Mild Pain
         Non-Opioids (Paracetamol, NSAIDs)
         ± Adjuvant

---

PART 1 - NON-OPIOID ANALGESICS

What are they?

---

A. Paracetamol (Acetaminophen)

• Mild to moderate pain
• Safe for stomach (unlike NSAIDs)
• Maximum dose: 4 g/day in adults; 2 g/day in elderly
• Overdose = acute liver failure - most dangerous effect

---

B. NSAIDs (Non-Steroidal Anti-Inflammatory Drugs)

• COX-1 = "housekeeping" - protects stomach lining, helps platelets
• COX-2 = "inflammation" - activated by injury/disease
• Traditional NSAIDs block both → more GI side effects
• COX-2 inhibitors (celecoxib) = selective; less GI harm but more cardiovascular risk

---

PART 2 - OPIOID ANALGESICS

What are they?

---

Opioid Receptors

---

Classification

Weak Opioids (Step 2)

Strong Opioids (Step 3)

---

Mechanism of Opioids (Simple)

---

Side Effects - Mnemonic "CONS-RISE"

---

Tolerance vs Dependence vs Addiction

---

Reversal Agent

---

PART 3 - ADJUVANT ANALGESICS

What are they?

---

A. Antidepressants

Tricyclic Antidepressants (TCAs)

• Examples: Amitriptyline, Nortriptyline
• Mechanism: Block reuptake of serotonin and norepinephrine → strengthen descending pain inhibitory pathways + sodium channel blockade
• Pain dose: Much lower than antidepressant dose (e.g., amitriptyline 10-75 mg at night)
• Used for: Neuropathic pain, fibromyalgia, migraine prevention, sleep disturbance in chronic pain
• Side effects: Sedation, dry mouth, constipation, urinary retention, cardiac arrhythmia - avoid in elderly

SNRIs (Serotonin-Norepinephrine Reuptake Inhibitors)

• Examples: Duloxetine, Venlafaxine
• Mechanism: Inhibit reuptake of serotonin + norepinephrine → strengthen descending inhibition of pain
• Used for: Diabetic neuropathy, fibromyalgia, chronic low back pain, musculoskeletal pain
• Duloxetine is FDA-approved for diabetic peripheral neuropathy AND fibromyalgia
• EULAR recommends duloxetine for fibromyalgia

---

B. Anticonvulsants (Gabapentinoids)

---

C. Corticosteroids

• Examples: Dexamethasone, Methylprednisolone, Triamcinolone
• Mechanism: Suppress phospholipase A2 and COX-2 → reduce prostaglandins, leukotrienes, histamine → powerful anti-inflammation
• Routes: Oral, IV, or local injection (intra-articular, peritendinous, epidural)
• Used for: Inflammatory arthritis flares, bursitis, tendinopathies, nerve root compression, cancer pain
• Local injection: Fewer systemic side effects; widely used in MSK physiotherapy practice
• Side effects (systemic/long-term): Osteoporosis, hyperglycemia, immunosuppression, adrenal suppression

---

D. Muscle Relaxants

• Examples: Cyclobenzaprine, Baclofen, Tizanidine, Methocarbamol
• Used for: Acute muscle spasm, spasticity (neurological causes)
• Recent evidence (2024): Systematic review found limited evidence supporting long-term use; associated with sedation and dependence risk [1]

---

E. Topical Analgesics

---

PART 4 - LOCAL ANESTHETICS

What are they?

---

Mechanism (Key Concept)

"The mechanism of action of local anesthetics is dose-dependent blockade of sodium currents in nerve fibers." - Sabiston Textbook of Surgery

1. Drug enters the nerve axon
2. Blocks voltage-gated Na⁺ channels (prevents Na⁺ influx)
3. No Na⁺ influx = no action potential
4. No action potential = no pain signal travels

---

Classification

By Chemical Structure

By Duration

---

Key Drugs

---

Routes Used in MSK / Physio Context

---

Toxicity of Local Anesthetics

---

PART 5 - MULTIMODAL ANALGESIA

Paracetamol + NSAID/COX-2 inhibitor + Low-dose opioid (if needed) + Adjuvant (if neuropathic component) + Local anesthetic (regional or topical)

"Multimodal analgesia includes using multiple analgesic classes targeting different mechanisms to reduce opioid requirements and side effects." - Miller's Anesthesia, 10th Ed.

---

PART 6 - RECENT EVIDENCE PERTAINING TO PHYSIOTHERAPY

---

1. Early Physiotherapy Reduces Opioid Use

---

2. Exercise Activates Endogenous Analgesia

• Endogenous opioid system (endorphins, enkephalins)
• Endocannabinoid system
• Serotonergic and noradrenergic descending inhibitory pathways

---

3. Non-Pharmacological Approaches Are First-Line (CDC & WHO)

---

4. Opioid Deprescribing and Physiotherapy

---

5. Exercise Therapy vs Manual Therapy for Chronic LBP

---

6. Non-Specific Effects of Physiotherapy on Pain

---

7. TENS as an Adjunct to Medications

---

8. Drugs That Help Physiotherapy Work (Clinical Integration)

---

QUICK SUMMARY TABLE

---

EXAM RAPID-FIRE POINTS

1. WHO ladder: Step 1 = Non-opioids → Step 2 = Weak opioids → Step 3 = Strong opioids
2. Paracetamol = pain + fever only; NOT anti-inflammatory
3. NSAIDs = pain + fever + inflammation; risk = GI ulcers, renal failure
4. All opioids act on Mu receptor; naloxone reverses overdose
5. Tramadol = weak opioid + SNRI mechanism (dual action)
6. Respiratory depression = most dangerous opioid side effect; reversed by naloxone
7. Constipation = most consistent opioid side effect; no tolerance develops
8. Gabapentin/Pregabalin = block Ca²⁺ channels; reduce central sensitization
9. Duloxetine = FDA-approved for diabetic neuropathy AND fibromyalgia
10. Local anesthetics = block Na⁺ channels; pain fibers blocked first, motor last
11. Bupivacaine = long-acting but highly cardiotoxic in IV overdose
12. Esters metabolized in blood; Amides metabolized in liver
13. Early physiotherapy reduces opioid use by 7-16%
14. Exercise = biological analgesic via endorphin + endocannabinoid + serotonin systems
15. CDC guidelines: Non-pharmacological approaches (including PT) = FIRST LINE for chronic MSK pain

---

REFERENCES (Vancouver Style)

1. Oldfield BJ, Gleeson B, Morford KL, Adams Z, Funaro MC, Becker WC. Long-Term Use of Muscle Relaxant Medications for Chronic Pain: A Systematic Review. JAMA Netw Open. 2024 Sep 3;7(9):e2434835. doi: 10.1001/jamanetworkopen.2024.34835. PMID: 39298168.
2. Alonso-Sal A, Alonso-Perez JL, Sosa-Reina MD, García-Noblejas-Fernández JA, Balani-Balani VG, Rossettini G. Effectiveness of Physical Activity in the Management of Nonspecific Low Back Pain: A Systematic Review. Medicina (Kaunas). 2024 Dec 16;60(12):2065. doi: 10.3390/medicina60122065. PMID: 39768944.
3. Mazurenko O, O'Brien E, Beug A, Smith SM, McCarthy C. Recommendations for managing adults with chronic non-cancer pain in primary care: A systematic clinical guideline review. J Eval Clin Pract. 2025 Feb;31(1):e14118. doi: 10.1111/jep.14118. PMID: 39104080.
4. Langford AV, Lin CC, Bero L, Blyth FM, Doctor J, Holliday S. Clinical practice guideline for deprescribing opioid analgesics: summary of recommendations. Med J Aust. 2023 Jul 17;219(2):64-70. doi: 10.5694/mja2.52002. PMID: 37356051.
5. Marcelo AC, Hilmer SN, Hunter DJ, Mathieson S, Mohamed R, Li L. Patient- and Clinician-Related Factors Associated With the Reduction in Opioid Use Among Adults With Chronic Non-Cancer Pain: A Systematic Review. Clin Pharmacol Ther. 2026 Jul;120(1):89-107. doi: 10.1002/cpt.70254. PMID: 41813618.
6. González-Gómez L, Moral-Munoz JA, Rosales-Tristancho A, Cuevas-Moreno A, Cardellat-González M, Rodríguez-Domínguez AJ. Exercise Therapy Versus Manual Therapy for the Management of Pain Intensity, Disability, and Physical Function in People With Chronic Low Back Pain: A Systematic Review With Meta-Analysis and Meta-Regression. Eur J Pain. 2025 Sep;29(7):e70090. doi: 10.1002/ejp.70090. PMID: 40747709.
7. Ezzatvar Y, Dueñas L, Balasch-Bernat M, Lluch-Girbés E, Rossettini G. Which Portion of Physiotherapy Treatments' Effect Is Not Attributable to the Specific Effects in People With Musculoskeletal Pain? A Meta-Analysis of Randomized Placebo-Controlled Trials. J Orthop Sports Phys Ther. 2024 Jun;54(6):1-13. doi: 10.2519/jospt.2024.12126. PMID: 38602164.
8. de Espíndula Brehm T, Pang Bilby AS, Guizzo KZ, Marcolino AM, Kuriki HU, Barbosa RI. Effects of Transcutaneous Electrical Nerve Stimulation (TENS) During Functional Activities or Exercise: A Systematic Review. Musculoskelet Care. 2024 Dec;22(4):e70020. doi: 10.1002/msc.70020. PMID: 39592440.