PTE · Reorder Paragraphs

The Biomechanics of Stretching

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1

Proprioceptive Neuromuscular Facilitation

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  1. APractitioners observed that alternating between passive stretching and isometric muscle contractions produced rapid gains in joint mobility.
  2. BThis deliberate contraction stimulates the Golgi tendon organs, which triggers autogenic inhibition and forces the surrounding muscle fibres to relax.
  3. CConsequently, sports scientists adapted these rehabilitation protocols for elite athletes seeking to maximise functional flexibility and range of motion.
  4. DProprioceptive neuromuscular facilitation was originally developed by physical therapists during the mid-twentieth century to rehabilitate patients with paralysis.

Questions 2–5

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2

The Myotatic Stretch Reflex

  1. AThis counteractive reflex causes an involuntary contraction designed to prevent severe structural tears in the fibres.
  2. BWhen a muscle is stretched too rapidly, these internal sensors generate rapid electrical signals to the spinal cord.
  3. CThe central nervous system responds immediately by sending motor impulses back to the affected muscle tissue.
  4. DFor this reason, practitioners of static stretching recommend moving slowly into positions to suppress this defensive neural response.
  5. ESkeletal muscles contain specialised sensory receptors known as muscle spindles that monitor changes in fibre length.
3

Fascial Tissue Remodelling

  1. AIn response, these stimulated cells synthesise fresh extracellular fluid and gradually reorganise dense, tangled collagen fibres into parallel alignments.
  2. BFascia is a continuous, dense fibrous network of collagenous connective tissue that envelops muscles, bones, and internal organs throughout the body.
  3. CSuch structural remodelling significantly increases overall tissue compliance, permanently reducing chronic joint stiffness and enhancing fluid athletic movement.
  4. DRegular mechanical tension applied during prolonged static stretching stimulates specialised resident cells within this matrix called fibroblasts.
4

Dynamic and Static Warm-Up Protocols

  1. ATo mitigate these performance deficits, contemporary guidelines strongly advocate dynamic stretching routines prior to vigorous physical activity.
  2. BHowever, modern biomechanical investigations demonstrated that this traditional practice temporarily reduces explosive muscular power.
  3. CResearchers established that prolonged holding of deep static postures desensitises motor units and diminishes muscle-tendon stiffness.
  4. DFor decades, sports instructors routinely prescribed prolonged static stretching as the foundational element of every pre-exercise warm-up.
  5. EThese active movements elevate core body temperature and prime neural pathways without dampening force production.
5

Viscoelastic Creep in Tendons

  1. AWhen subjected to steady, low-intensity tensile strain during stretching, these collagenous structures undergo a gradual elongation known as viscoelastic creep.
  2. BThis time-dependent deformation occurs because fluid and interstitial water molecules are gradually displaced from the surrounding extracellular matrix.
  3. COnce this external stretching tension is removed, the tissue slowly reabsorbs fluid and gradually recovers its original anatomical length.
  4. DTendons exhibit distinct viscoelastic properties, meaning their mechanical behaviour depends directly on both the applied load and the duration of strain.

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