Creeping Application Doses & Muscle Work in Physiotherapy

What Are "Creeping Application Doses"?

• In the acute/subacute phase of injury or surgery
• In patients with pain sensitization, inflammation, or weak connective tissue
• When initiating exercise after prolonged immobilisation
• In elderly or deconditioned populations

Key Parameters That Are "Crept Up"

Muscle Work in Physiotherapy — Types and Therapeutic Applications

1. Concentric Work (Shortening Contraction)

• The muscle shortens while contracting (internal force > external force)
• Example: Lifting phase of a biceps curl; knee extension in a leg press
• Therapeutic use: Building dynamic strength, activating weak muscles, early rehabilitation
• Generates less force per unit of cross-sectional area than eccentric work
• Lower risk of DOMS (delayed-onset muscle soreness)

2. Eccentric Work (Lengthening Contraction)

• The muscle lengthens while generating force (internal force < external force)
• Example: Lowering phase of a biceps curl; walking downstairs
• Therapeutic use: Tendinopathies (Achilles, patellar), muscle-tendon interface remodelling, advanced strengthening
• Produces greatest force per unit area and greatest risk of microtrauma → must be introduced with a creeping dose approach
• Evidence-based in Alfredson heel-drop protocol for Achilles tendinopathy

3. Isometric Work (Static Contraction)

• Tension generated with no change in muscle length
• Example: Wall squat hold, shoulder external rotation against a fixed object
• Therapeutic use: Acute/post-operative phase (safe for joints), pain inhibition (isometrics reduce cortical pain inhibition), maintaining muscle mass during immobilisation
• Angle-specific strength gain (±20° transfer zone)

4. Isokinetic Work

• Muscle contracts at a constant angular velocity using specialised equipment (e.g. Cybex, Biodex)
• Therapeutic use: Objective strength testing, late-stage rehabilitation, sports return-to-play assessment
• Produces maximal strength gains across the full ROM
• Expensive equipment; usually limited to sports medicine/hospital settings

5. Auxotonic Work

• Both force and length change simultaneously — the most common real-world pattern
• Seen in resistance band exercises where band tension increases as it is stretched

Muscle Fiber Types and Dosing Implications

Practical Dosing Scheme (Creeping Principle)

Phase 1 — Activation (acute, days 1–14)
  → Isometric contractions, pain-free ROM
  → Load: body weight or minimal resistance
  → Dosing: 2–3×/week, 2 sets × 8–12 reps

Phase 2 — Stabilisation (subacute, weeks 2–6)
  → Concentric + isometric, closed-chain
  → Load: 30–50% 1RM
  → Dosing: 3×/week, 3 sets × 10–15 reps

Phase 3 — Strengthening (weeks 6–12)
  → Concentric + eccentric introduced gradually
  → Load: 50–70% 1RM
  → Dosing: 3–4×/week, 3–4 sets × 8–12 reps

Phase 4 — Functional / Return to Sport
  → Eccentric, plyometric, isokinetic testing
  → Load: 70–85% 1RM
  → Dosing: as sport/activity demands

Why "Creeping" Rather Than Immediate Maximal Loading?

1. Tissue tolerance: Tendons and cartilage adapt more slowly than muscle (weeks–months vs days). Rapid dose escalation overloads connective tissue before it can remodel.
2. Pain neurophysiology: High early loads can sensitise nociceptors and reinforce fear-avoidance. Sub-threshold loads allow desensitisation.
3. Motor re-learning: Neuromuscular re-education after injury requires precise, repeatable low-intensity signals before high-load coordination is restored.
4. Avoiding re-injury: The weakest point during rehabilitation is the collagen scar — creeping doses allow it to gain tensile strength before being fully loaded.

Summary