Physiological effect and therapeutic effect of active movement, passive movement, deep friction
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Physiological & Therapeutic Effects of Active Movement, Passive Movement, and Deep Friction
1. ACTIVE MOVEMENT
Active movement is movement initiated and maintained by the patient through voluntary muscle contraction.
Physiological Effects
| System | Effect |
|---|---|
| Muscular | Muscle fibers contract and shorten; increases muscle strength, bulk, and endurance |
| Cardiovascular | Increases heart rate, cardiac output, and blood flow to working muscles; promotes capillarisation |
| Neurological | Activates the central and peripheral nervous systems; promotes neuroplasticity - the formation of new neural connections and cortical motor map reorganization |
| Metabolic | Increases oxygen consumption, glucose utilization, and metabolic rate; promotes removal of metabolic waste products (CO2, lactic acid) |
| Articular/Connective tissue | Stimulates synovial fluid production, nourishing articular cartilage; maintains collagen alignment and joint integrity |
| Proprioceptive | Strong activation of mechanoreceptors, muscle spindles, and Golgi tendon organs; feeds back to CNS for coordinated movement control |
| Respiratory | Increases respiratory rate and tidal volume to meet increased oxygen demand |
Therapeutic Effects
- Strengthening and hypertrophy - progressive resistance active exercises increase muscle cross-sectional area
- Improving range of motion (ROM) - active stretching during movement gradually increases joint mobility
- Neuroplasticity and motor learning - repetitive voluntary movement is essential for retraining motor skills after stroke, TBI, or spinal cord injury; engages feedforward (intention-based) motor control
- Functional rehabilitation - active movement patterns mirror real-world demands; builds self-efficacy and independence in ADLs
- Reducing spasticity - active mobilization alongside passive movement affects spinal neuronal circuits and fibro-elastic muscle properties, reducing tone
- Preventing deconditioning - maintains muscle mass, cardiovascular fitness, and bone density during recovery
- Psychological benefit - sense of agency and control during active participation improves motivation and compliance
2. PASSIVE MOVEMENT
Passive movement is movement of a body part produced by an external force (therapist, gravity, machine) without voluntary muscle contraction by the patient.
Physiological Effects
| System | Effect |
|---|---|
| Circulatory | Promotes venous and lymphatic return; assists blood flow in paralyzed or immobile limbs; reduces dependent oedema |
| Articular | Stimulates synovial fluid production and joint nutrition; maintains cartilage health |
| Soft tissue | Maintains length of muscles, tendons, ligaments, and capsule; prevents adaptive shortening and contracture |
| Neurological | Provides sensory (proprioceptive and cutaneous) input to the CNS even without voluntary movement; this afferent input can support brain retraining when the patient attends to the movement |
| Respiratory | Chest passive movements can assist in ventilation in patients on mechanical ventilation or with respiratory muscle weakness |
| Tone | Rhythmic passive movement modulates neuronal excitability and can temporarily reduce spasticity |
Therapeutic Effects
- Prevention of contractures - regular passive ROM maintains musculo-tendinous length in paralyzed or comatose patients and those in prolonged immobilization
- Reducing spasticity - passive mobilization affects spinal neuronal circuits and the fibro-elastic properties of muscles, producing antispastic effects (most notable when combined with active movement)
- Maintaining joint range - prevents capsular adhesion, fibrosis, and joint stiffness secondary to disuse
- Early mobilization - recommended by the American Heart Association in the acute stage of stroke; can be started before voluntary movement returns
- Sensory stimulation and neuroplasticity - consistent repetition of passive movements stimulates neuroplasticity provided the patient actively attends to the movement; a 2024 study (Flint Rehab, citing recent evidence) found passive exercise can offer similar brain health benefits to active exercise when performed with focused attention
- Pain relief - movement-induced analgesia through activation of mechanoreceptors that gate pain signals
- Preparation for active exercise - warms up muscles and joints before active strengthening begins
Key distinction: The passive-to-active progression is a core rehabilitation principle. Passive exercise prepares tissues; active exercise drives long-term functional recovery and neurological reorganization.
3. DEEP FRICTION (Deep Transverse Friction Massage - DTFM)
Developed by Dr. James Cyriax in the 1930s, deep friction involves applying firm, transverse (cross-fiber) or circular pressure directly to soft tissue structures using fingers or thumbs - without gliding over the skin surface.
Physiological Effects
| Effect | Mechanism |
|---|---|
| Vasodilation and hyperemia | Friction raises local tissue temperature, causing blood vessel dilation and increased blood flow; delivers oxygen and nutrients to the area |
| Breakdown of adhesions and scar tissue | Transverse friction mechanically disrupts abnormal cross-links between collagen fibers formed during scar healing |
| Collagen realignment | Forces disorganized scar tissue collagen fibers to realign along lines of stress - producing a stronger, more functional repair |
| Enhanced fibroblastic activity | Mechanical stimulation activates fibroblasts to produce new, organized collagen |
| Increased tissue temperature | Raises local metabolic rate, increases tissue extensibility, and reduces viscosity of collagen |
| Pain modulation | Friction generates afferent signals that compete with and block nociceptive (pain) signals via gate control mechanism; also promotes endorphin release |
| Traumatic hyperemia | Brief reactive inflammation is deliberately induced; this recruits healing cells to the area to restart or accelerate the repair process |
| Lymphatic drainage | Mechanical pressure aids movement of lymph and interstitial fluid, reducing localized edema |
Therapeutic Effects
- Tendinopathy treatment - primary use; breaks down degenerative tendon tissue, promotes collagen remodeling alongside eccentric loading and tenotomy; used in conditions like Achilles tendinopathy, patellar tendinopathy, lateral epicondylitis
- Ligament sprains - transverse friction at ligamentous sites prevents adhesion formation between ligament and underlying bone; used in ankle, knee, and wrist ligament injuries
- Muscle belly lesions - friction at the site of a muscle strain ensures mobile scar formation rather than adhesions
- Restoring ROM - breaks down fibrotic adhesions and increases tissue elasticity, directly expanding available joint range of motion
- Scar tissue remodeling - post-surgical or post-injury scars benefit from friction to improve tissue mobility and reduce tethering
- Chronic periarticular conditions - used in tenosynovitis, bursitis (with caution), plantar fasciitis, and iliotibial band syndrome
Cyriax's Application Principles
- Accurate anatomical diagnosis - friction must be placed precisely at the lesion site
- The therapist's fingers and patient's skin must move together (no gliding)
- Sufficient depth and sweep to reach the lesion
- For muscle lesions: muscle kept relaxed (on slack)
- For tendon without sheath: tendon on stretch
- For tendon with sheath: tendon on stretch
- Duration: typically 10-20 minutes per session
Evidence Note
A Cochrane review on deep transverse friction massage for lateral epicondylitis and knee tendinitis found insufficient evidence to confirm or refute clinically important benefits, noting trials were small. Deep friction is best used as part of a broader multimodal physiotherapy program rather than as a standalone treatment.
Summary Comparison Table
| Feature | Active Movement | Passive Movement | Deep Friction |
|---|---|---|---|
| Muscle activation | Yes (voluntary) | No | No |
| Neuroplasticity | Strong | Moderate (requires attention) | Indirect (pain gating) |
| ROM maintenance | Yes | Yes | Yes (via adhesion breakdown) |
| Strengthening | Primary benefit | None | None |
| Scar/adhesion management | Indirect | Indirect | Direct |
| Indicated when | Patient can contract muscle | Paralysis, coma, acute phase | Chronic tendon/ligament lesions |
| Main risk | Overexertion | Joint injury if overpressured | Post-treatment soreness, skin irritation |
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