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FITT principle aerobic exercise prescription exercise therapy 5 marks
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The library doesn't have a dedicated exercise therapy textbook, so I'll answer all questions from my comprehensive knowledge in exercise therapy. Here are thorough answers for each topic (5 marks each):
Exercise Therapy - Question Bank Answers (5 Marks Each)
2.A.8 - Delorme's, MacQueen & Oxford Technique
Delorme's Technique (Progressive Resistive Exercise - PRE)
Developed by Thomas Delorme (1945) for progressive strengthening.
Principle: Uses 10 Repetition Maximum (10 RM) - the maximum weight a patient can lift 10 times.
Protocol (3 sets):
| Set | Resistance | Repetitions |
|---|---|---|
| 1st | 50% of 10 RM | 10 reps |
| 2nd | 75% of 10 RM | 10 reps |
| 3rd | 100% of 10 RM | 10 reps |
- The 10 RM is reassessed weekly and increased accordingly.
- Rest between sets: 2-3 minutes.
MacQueen's Technique
Modified approach using fewer sets at high intensity.
- 3-4 sets of 10 repetitions at 100% of 10 RM for muscle hypertrophy.
- For endurance: 3 sets of 25-50 repetitions at lighter loads.
Oxford Technique (Zinovieff, 1951)
Opposite of Delorme's - starts heavy, ends light (reverse pyramid).
Protocol:
| Set | Resistance | Repetitions |
|---|---|---|
| 1st | 100% of 10 RM | 10 reps |
| 2nd | 75% of 10 RM | 10 reps |
| 3rd | 50% of 10 RM | 10 reps |
Rationale: As muscles fatigue during the session, the load is progressively reduced. This technique accommodates muscle fatigue more naturally.
Comparison: Delorme's is better for early rehabilitation; Oxford is better suited for later stages when muscles can handle heavy initial loads.
2.A.9 - Physiological Changes of Aerobic Exercise
Aerobic exercise involves sustained, rhythmic activity using large muscle groups with adequate oxygen supply.
Acute (Immediate) Changes:
Cardiovascular:
- Heart rate increases proportionally to workload
- Cardiac output rises (from ~5 L/min at rest to 20-25 L/min)
- Stroke volume increases
- Systolic BP rises; diastolic remains stable or slightly decreases
- Blood flow redistributes to active muscles (vasodilation)
Respiratory:
- Respiratory rate increases (from 12-15 to 40-60 breaths/min)
- Tidal volume increases
- Minute ventilation increases significantly
- Oxygen uptake (VO2) increases linearly with workload
Metabolic:
- Increased glucose and fatty acid utilization
- Lactic acid remains low (below anaerobic threshold)
- Body temperature rises; sweating begins
Chronic (Long-term) Adaptations:
Cardiovascular:
- Resting heart rate decreases (athlete's heart: 40-60 bpm)
- Increased stroke volume and cardiac output
- Cardiac hypertrophy (eccentric - enlarged chamber)
- Increased capillary density in muscles
- Lower resting blood pressure
Respiratory:
- Increased lung capacity and diffusion capacity
- More efficient oxygen extraction (increased A-V O2 difference)
Musculoskeletal:
- Increased mitochondrial density in muscle fibers
- Increased oxidative enzyme activity
- Increased myoglobin content
- Type IIb fibers shift toward Type IIa (more oxidative)
- Increased bone density
Metabolic:
- Increased VO2 max
- Improved lipid profile (increased HDL, decreased LDL)
- Better insulin sensitivity
- Decreased body fat percentage
2.A.10 - Different Energy Systems in the Human Body
Three energy systems provide ATP for muscle contraction:
1. ATP-PCr System (Phosphagen System)
- Duration: 0-10 seconds
- Intensity: Maximum (sprinting, jumping)
- Fuel: Phosphocreatine (PCr)
- Oxygen needed: No (anaerobic)
- Process: PCr + ADP → ATP + Creatine (via creatine kinase)
- ATP yield: Very low (limited PCr stores)
- Recovery: ~30 seconds to replenish
2. Glycolytic System (Anaerobic Glycolysis / Lactic Acid System)
- Duration: 10 seconds - 2 minutes
- Intensity: High
- Fuel: Glucose/glycogen
- Oxygen needed: No
- Process: Glucose → Pyruvate → Lactate + ATP
- ATP yield: 2-3 ATP per glucose molecule
- Byproduct: Lactic acid (causes muscle fatigue/burn)
3. Oxidative System (Aerobic System)
- Duration: >2 minutes (unlimited with fuel)
- Intensity: Low to moderate
- Fuel: Carbohydrates, fats, proteins
- Oxygen needed: Yes
- Process: Krebs cycle + Electron Transport Chain
- ATP yield: 36-38 ATP per glucose molecule; fats yield even more
- Preferential fuel: Carbohydrates at moderate intensity; fats at low intensity
Clinical Relevance in Rehabilitation:
- Early post-injury exercises rely on phosphagen system
- Strengthening exercises use glycolytic system
- Endurance/aerobic training targets the oxidative system
2.A.11 - Basic Principles of PNF (Proprioceptive Neuromuscular Facilitation)
Developed by Kabat, Knott, and Voss, PNF uses proprioceptive input to facilitate or inhibit neuromuscular responses.
Neurophysiological Basis:
- Stimulates muscle spindles (via stretch) and Golgi tendon organs (via resistance)
- Uses diagonal and spiral movement patterns that mirror functional activities
Basic PNF Techniques:
1. Rhythmic Initiation
- Passive → active-assisted → active movement
- Used for: patients with hypertonicity or difficulty initiating movement
2. Contract-Relax (CR)
- Isotonic contraction of tight muscle → relaxation → passive stretch
- Uses autogenic inhibition (via GTOs)
3. Hold-Relax (HR)
- Isometric contraction of tight muscle → relaxation → passive stretch
- Safer for acute conditions/pain
4. Agonist Contract (AC)
- Contraction of agonist to reciprocally inhibit the antagonist (tight muscle)
- Uses reciprocal inhibition
5. Slow Reversal (SR)
- Alternating isotonic contractions of agonist and antagonist
- Improves coordination and strength
6. Rhythmic Stabilization
- Alternating isometric contractions without joint movement
- Improves joint stability
Basic Principles:
- Manual contact - provides tactile input and guidance
- Stretch stimulus - quick stretch facilitates muscle contraction
- Traction and approximation - facilitates movement and stability respectively
- Verbal commands - timing and tone influence motor output
- Diagonal patterns - D1 and D2 for upper and lower limbs
- Irradiation - overflow from stronger to weaker muscles
- Resistance - facilitates motor learning and strength
2.A.12 - D1 and D2 Patterns for Lower Limb
PNF patterns use diagonal/spiral motions combining flexion/extension with rotation and abduction/adduction.
D1 Flexion Pattern (Lower Limb):
- Hip: Flexion + Adduction + External Rotation
- Knee: Can be flexed or extended
- Ankle/Foot: Dorsiflexion + Inversion
- Think: kicking a ball across the body
D1 Extension Pattern (Lower Limb):
- Hip: Extension + Abduction + Internal Rotation
- Knee: Can be flexed or extended
- Ankle/Foot: Plantarflexion + Eversion
- Opposite diagonal
D2 Flexion Pattern (Lower Limb):
- Hip: Flexion + Abduction + Internal Rotation
- Knee: Can be flexed or extended
- Ankle/Foot: Dorsiflexion + Eversion
- Think: lifting leg out to the side
D2 Extension Pattern (Lower Limb):
- Hip: Extension + Adduction + External Rotation
- Knee: Can be flexed or extended
- Ankle/Foot: Plantarflexion + Inversion
Clinical Application:
- D1 pattern trains hip adductors, useful after hip replacement
- D2 pattern trains hip abductors/extensors, useful in gait training
- Both patterns improve coordination, strength, and proprioception
- Used in stroke rehabilitation, sports rehabilitation, and post-surgical recovery
2.A.13 - Functional Re-education: Concept and Importance in Rehabilitation
Concept:
Functional re-education is the process of retraining the neuromuscular system to perform purposeful, task-specific movements that are required for daily living, work, and recreation. It bridges the gap between isolated muscle strengthening and real-world functional performance.
Principles:
- Task-specificity - training must closely mimic the target activity
- Progressive loading - from simple to complex tasks
- Proprioceptive feedback - using sensory input for motor learning
- Repetition - motor programs are reinforced through repetitive practice
- Integration - combines strength, balance, coordination, and endurance
Importance in Rehabilitation:
| Goal | Benefit |
|---|---|
| Restores ADL independence | Patient can perform self-care, transfers, ambulation |
| Neuromuscular re-education | Retrains movement patterns after nerve/muscle injury |
| Prevents compensatory patterns | Corrects abnormal movement before they become habitual |
| Improves proprioception | Reduces fall risk, especially in elderly |
| Enhances confidence | Patient regains trust in their body |
| Shortens hospital stay | Faster return to independent function |
Clinical Examples:
- Gait re-education after stroke or TKR
- Balance training after ankle sprain
- Sit-to-stand training post hip surgery
- Hand function training after nerve repair
- Return-to-sport protocols in athletes
2.A.14 - Sequence and Training Techniques of Lying to Sitting Activities
This is a fundamental mat activity used in rehabilitation to develop core strength, balance, and transfer ability.
Sequence (Supine to Sitting):
Step 1 - Supine to Side-lying:
- Patient rolls to one side (log roll or segmental roll)
- Head leads or limbs lead depending on ability
- Therapist assists at shoulder/pelvis if needed
Step 2 - Side-lying to Propped on Elbow:
- Weight shifts onto the lower elbow
- Upper arm pushes into the mat
Step 3 - Propped on Elbow to Hand:
- Elbow straightens → weight on extended lower arm (long sitting preparation)
- Core activation increases
Step 4 - Pushing Up to Sitting:
- Combined trunk flexion and arm push
- Legs swing over the edge of the mat (for edge sitting) OR remain flat (for long sitting)
Step 5 - Achieving Stable Sitting:
- Long sitting (legs extended) or short sitting (legs over edge)
- Maintain upright trunk against gravity
Training Techniques:
- Manual assistance: Therapist guides head/trunk/legs
- Gravity-eliminated position used first, then against gravity
- Facilitation techniques: PNF rhythmic initiation to begin movement
- Strengthening prerequisites: Upper limb, core, neck muscles
- Functional progression: Supine → side-lying → sitting → standing
- Practice in different environments to enhance generalization
2.A.15 - Various Mat Activities for Early Functional Re-education
Mat activities are performed on a floor mat and form the foundation of early rehabilitation, especially after neurological conditions, spinal injuries, or major orthopedic surgeries.
Categories and Examples:
1. Rolling Activities:
- Segmental rolling (head leads, then trunk, then pelvis)
- Log rolling (entire body rolls as one unit - used post spinal surgery)
- Purpose: Trunk mobility, muscle activation, bed mobility
2. Prone Activities:
- Prone on elbows (sphinx position)
- Prone push-ups
- Quadruped (hands and knees)
- Purpose: Spinal extension, scapular stability, trunk control
3. Sitting Activities:
- Long sitting (legs extended)
- Short sitting (legs over edge)
- Side sitting
- Purpose: Balance, trunk control, weight-bearing through upper limbs
4. Transition Activities:
- Supine to side-lying to sitting
- Sitting to standing
- Purpose: Functional transfers, ADL independence
5. Kneeling Activities:
- High kneeling
- Half kneeling
- Purpose: Hip extension, core stability, pre-gait training
6. Crawling/Creeping:
- Quadruped → reciprocal crawling
- Purpose: Reciprocal limb coordination, core activation
7. Bridging:
- Supine with hips/knees bent → lift pelvis
- Purpose: Gluteal and core strengthening, bed mobility
Principles of Mat Progression:
Low center of gravity → high, wide base of support → narrow, higher center of gravity. Always progress from stable to unstable, simple to complex.
2.A.16 - Frenkel's Exercises with Indications
Developed by Heinrich Frenkel (1887) for patients with sensory ataxia due to tabes dorsalis; now used broadly for cerebellar and sensory ataxia.
Principle:
Uses visual and auditory feedback to compensate for lost proprioceptive control. Emphasizes precision, repetition, and concentration to re-establish voluntary motor control.
Rules of Frenkel's Exercises:
- Performed slowly and deliberately
- Vision is used to monitor limb position
- Verbal counting or metronome used for rhythm
- Movements progress from simple to complex
- Performed in supported positions first, then unsupported
Progression (Lower Limb):
Class I (Lying):
- Heel sliding along the bed
- Lifting and placing heel on a target point
- Bilateral reciprocal leg movements
Class II (Sitting):
- Foot placing on marked points on the floor
- Knee extension/flexion with control
- Rise from and sit on a chair
Class III (Standing):
- Weight shifting side to side
- Walking sideways
- Turning in place
Class IV (Walking):
- Walking along a line
- Walking placing feet on footprints
- Walking around obstacles
Indications:
- Sensory (posterior column) ataxia - tabes dorsalis, subacute combined degeneration
- Cerebellar ataxia (modified)
- Multiple sclerosis with ataxia
- Friedreich's ataxia
- Post-stroke coordination deficits
- Peripheral neuropathy affecting proprioception
Contraindications:
- Severe cognitive impairment (requires concentration)
- Visual impairment (requires vision for feedback)
- Severe spasticity
2.A.17 - FITT Principle in Aerobic Exercise Prescription
FITT is a framework for designing individualized aerobic exercise programs.
| Letter | Component | Description |
|---|---|---|
| F | Frequency | How often |
| I | Intensity | How hard |
| T | Time (Duration) | How long |
| T | Type | What kind |
F - Frequency:
- Beginners/cardiac patients: 3-5 days/week
- General health: 5 days/week at moderate intensity OR 3 days/week at vigorous intensity
- ACSM recommendation: Minimum 3 days/week for cardiorespiratory improvement
I - Intensity:
Measured by:
- Heart Rate Reserve (Karvonen Method): Target HR = Resting HR + 40-85% (Max HR - Resting HR)
- %Max HR: 50-85% of Max HR (Max HR = 220 - age)
- RPE (Borg Scale): 12-16 out of 20 (moderate to somewhat hard)
- MET levels: 3-6 METs moderate; >6 METs vigorous
- Talk test: Moderate = can speak but not sing
T - Time (Duration):
- Moderate intensity: 30-60 minutes/day (150 min/week minimum)
- Vigorous intensity: 20-60 minutes/day (75 min/week minimum)
- Can be accumulated in 10-minute bouts
- Gradually increase by no more than 10% per week
T - Type:
- Rhythmic, continuous, large muscle group activities
- Examples: walking, jogging, cycling, swimming, aerobics, rowing
- Choice based on patient's fitness level, joint status, and goals
Clinical Application: For cardiac rehab patients, FITT is applied conservatively starting at 40% HRR, progressing weekly. For post-orthopedic patients, non-weight bearing types (cycling, swimming) are preferred initially.
2.A.18 - Role of Aerobic Exercise in Improving Cardiovascular Fitness
Definition:
Cardiovascular fitness (cardiorespiratory fitness) is the ability of the heart, lungs, and circulatory system to supply oxygen to working muscles during sustained exercise. Best measured by VO2 max.
Mechanisms of Cardiovascular Improvement:
Cardiac Adaptations:
- Eccentric cardiac hypertrophy: Increased left ventricular volume and stroke volume
- Decreased resting heart rate (bradycardia): More efficient pumping
- Increased maximum cardiac output: From ~20 L/min to 30-40 L/min in trained athletes
- Increased heart rate recovery: Heart returns to resting rate faster after exercise
Vascular Adaptations:
- Increased capillary density in skeletal muscle (angiogenesis)
- Improved endothelial function and arterial compliance
- Reduced arterial stiffness
- Lower resting blood pressure (systolic/diastolic)
- Improved peripheral vascular resistance
Blood and Oxygen Carrying Capacity:
- Increased plasma volume (hemodilution effect early on)
- Increased red blood cell mass and hemoglobin with continued training
- Increased arteriovenous oxygen difference (more oxygen extracted per unit of blood)
- Enhanced mitochondrial density and oxidative enzyme activity in muscles
Metabolic Benefits:
- Increased VO2 max (gold standard measure of cardiovascular fitness)
- Improved lactate threshold (can work harder before lactate accumulates)
- Better fat oxidation, sparing glycogen
- Improved insulin sensitivity, reduced HbA1c
Clinical Benefits:
- Reduced risk of coronary artery disease, hypertension, stroke
- Improved outcomes after cardiac events (cardiac rehabilitation)
- Reduced mortality in heart failure patients
- Better functional capacity and quality of life in chronic disease
2.A.19 - Sequence and Techniques of Lying to Sitting
(This overlaps with 2.A.14 - answered above in detail)
To supplement:
Additional Techniques Used:
Passive → Active-Assisted → Active Progression:
- Begin with therapist doing all the work, then reduce assistance as patient gains strength
Key Muscle Groups Required:
- Neck flexors (head control)
- Abdominals and obliques (trunk flexion and rotation)
- Hip flexors (leg movement)
- Upper limb extensors and shoulder girdle (push-up from elbow/hand)
Compensatory Strategies:
- Patients with weak trunk use elbow push technique
- Hemiplegic patients use unaffected side to initiate rolling
- Spinal cord injury patients use momentum and head-neck movement
Grading Difficulty:
- Supine to side-lying with full assistance
- Side-lying to sitting with arm support
- Independent rolling and sitting
- Long sitting with dynamic balance challenges
- Sitting with UE tasks (reaching, throwing)
These answers are aligned with standard Exercise Therapy textbook content (Kisner & Colby's Therapeutic Exercise, Susan O'Sullivan's Physical Rehabilitation) suitable for 5-mark exam questions in physiotherapy/physical therapy curricula.
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Dfain IFT or SD curv
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interferential therapy IFT electrotherapy physiotherapy explained
Here are detailed answers for both topics:
IFT (Interferential Therapy)
Definition
IFT is a medium-frequency electrotherapy modality that uses two slightly different medium-frequency alternating currents that intersect within the body tissue, producing a low-frequency beat (interference) effect at the treatment site - without the discomfort of direct low-frequency stimulation.
Physical Principle
- Two sinusoidal AC currents are passed through the tissues simultaneously via two separate circuits
- Circuit 1: Fixed frequency - typically 4000 Hz
- Circuit 2: Variable frequency - typically 4001 to 4250 Hz
- Where the two currents intersect, they interfere with each other
- The resulting beat frequency = difference between the two currents
- e.g., 4000 Hz vs 4100 Hz → beat frequency = 100 Hz
- This beat frequency (1-250 Hz range) produces the therapeutic effect
- Medium frequency (4000 Hz) passes through skin easily (low skin impedance), while the resulting low frequency provides the physiological benefit
Why Medium Frequency is Used
- Skin impedance is inversely proportional to frequency
- At 4000 Hz, skin impedance is very low → current penetrates deeply and comfortably
- Direct low-frequency current would cause skin discomfort and pain at equivalent intensities
Parameters / Settings
| Parameter | Range |
|---|---|
| Carrier frequency | 4000 Hz (most common) |
| Beat frequency | 1 - 250 Hz |
| Sweep mode | Fixed or sweep (auto-varying beat frequency) |
| Electrode placement | 4-pole (quadripolar) or 2-pole (bipolar) |
| Treatment duration | 10-20 minutes |
Beat Frequency and Effects
| Beat Frequency | Physiological Effect |
|---|---|
| 1-10 Hz | Muscle contraction (denervated muscle) |
| 10-25 Hz | Tetanic muscle contraction (strengthening) |
| 25-50 Hz | Muscle pumping effect, reduce oedema |
| 80-100 Hz | Analgesia (pain relief) - most used |
| 90-100 Hz | Endorphin release, sedation |
| 130-150 Hz | Vasodilation, increased circulation |
Physiological Effects
- Analgesia - Gate control mechanism + endorphin release
- Muscle stimulation - Re-education, prevention of atrophy
- Increased circulation - Vasodilation, reduced oedema
- Reduced muscle spasm - Direct muscle relaxation
- Accelerated tissue healing - Increased blood flow and cellular activity
Electrode Placement
- 4-pole method: Two circuits placed so currents cross at the target tissue (45° angle)
- 2-pole method: Single circuit with internal interference (vector sweep IFT)
- Electrodes placed around the painful area, not directly on it
Indications
- Acute and chronic pain (back pain, joint pain, sports injuries)
- Oedema reduction (post-surgical, post-traumatic)
- Muscle re-education and strengthening
- Osteoarthritis, rheumatoid arthritis
- Stress urinary incontinence (pelvic floor stimulation)
- Peripheral nerve injuries
- Post-fracture rehabilitation
Contraindications
- Cardiac pacemaker
- Over malignant tissue
- Thrombosis / thrombophlebitis
- Pregnancy (over trunk/pelvis)
- Over skin with impaired sensation
- Active infection / open wounds
- Epilepsy (over head)
SD Curve (Strength-Duration Curve)
Definition
The Strength-Duration (SD) curve is a graphical representation of the relationship between the intensity (strength) of an electrical stimulus and the duration (pulse width) required to produce a minimal muscle contraction (threshold response).
Basic Concepts
Rheobase
- The minimum current intensity required to produce a threshold muscle contraction when using an infinitely long pulse duration
- In practice, measured at a pulse width of 300 ms or more
- Unit: milliamperes (mA)
Chronaxie
- The pulse duration required to produce a threshold contraction at twice the rheobase intensity
- It is a measure of the excitability of the nerve/muscle
- Normal nerve: Chronaxie = 0.1 - 1 ms (short - excitable)
- Denervated muscle: Chronaxie = 10 - 100 ms (long - less excitable)
- Clinical significance: The lower the chronaxie, the more excitable the tissue
The Curve Shape
Intensity
(mA)
|
| * (High I needed for short pulses)
| *
| *
| * *
| * * * * * * * ← Rheobase (plateau)
|________________________________
Short Long
Pulse Duration (ms)
- The curve is hyperbolic in shape
- Short pulses need HIGH intensity
- Long pulses plateau at the rheobase
- Normal innervated muscle: Curve is steep, shifts LEFT (short chronaxie)
- Denervated muscle: Curve shifts RIGHT (long chronaxie, high rheobase)
Normal vs. Denervated SD Curve
| Feature | Normal (Innervated) | Denervated Muscle |
|---|---|---|
| Chronaxie | 0.1-1 ms | 10-100 ms |
| Rheobase | Low | High |
| Curve position | Left (steep) | Right (flat/shifted) |
| Response to short pulses | Responds well | Poor response |
| Response to long pulses | Responds | Responds (sluggish) |
| Curve shape | Smooth hyperbola | "Kink" in curve |
The "Kink" (Discontinuity)
- In partial denervation, the SD curve shows a kink or discontinuity
- This occurs because both innervated (responding to short pulses) and denervated fibers (responding only to long pulses) are present
- The kink indicates partial nerve damage - important prognostic sign
Clinical Uses of SD Curve
- Diagnose denervation - differentiate between neuropraxia, axonotmesis, neurotmesis
- Monitor nerve regeneration - curve gradually shifts left as nerve recovers
- Determine treatment parameters - pulse width for electrical stimulation therapy
- Prognosis - rate of recovery can be tracked over weeks
- Differentiate UMN vs LMN lesions
Interpretation Summary
| Finding | Interpretation |
|---|---|
| Normal curve, left position | Healthy innervated muscle |
| Shift to right, raised rheobase | Denervation |
| Kink in curve | Partial denervation |
| Gradual shift left over weeks | Nerve regeneration occurring |
| Accommodation (ratio > 6) | Normal nerve |
| No accommodation | Denervated muscle |
Accommodation Index
- Normal nerve shows accommodation - it adapts to slowly rising current
- Accommodation ratio = rheobase using slowly rising current / rheobase using rectangular pulse
- Normal: >6 (nerve accommodates)
- Denervated: <1.5 (muscle does NOT accommodate - responds equally to both)
Both IFT and SD Curve are standard topics in electrotherapy for physiotherapy/BPT students. IFT is used therapeutically, while the SD Curve is a diagnostic and monitoring tool for nerve-muscle integrity.
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