2004 Erik Witvrouw - Stretching and Injury Prevention An Obscure Relati [retrieved_2025-03-18]

Stretching and Injury Prevention

Abstract

  • Increasing muscle-tendon unit flexibility is believed to improve performance and reduce injuries.

  • Contradictory evidence exists: some studies suggest stretching prevents injuries, while others show no effect.

  • No scientifically established guidelines for stretching exercises exist.

  • Recommendations on stretching are often based on misconceptions and conflicting research findings.

  • The type of sport influences the relationship between stretching and injury risk.

1. Working Mechanism of the Musculotendinous Unit during Movement

  • Muscle-tendon systems generate force in two main ways:

    • As an elastic spring in stretch-shortening cycles (SSCs), particularly in jumping.

    • Converting metabolic energy into mechanical work in concentric contractions.

  • A stiffer muscle-tendon unit performs better in isometric and concentric actions.

  • Musculotendinous stiffness is not significantly related to eccentric performance.

2. How Can Stretching Reduce the Risk of Injuries?

  • Compliance of the muscle-tendon unit is crucial for reducing injury risk.

  • Stiffer muscle-tendon systems quickly transfer force, enhancing performance.

  • Increased muscular stiffness could benefit sports requiring quick energy transfer.

  • Stretching prior to high-intensity SSC activities enhances energy storage and performance.

3. Stretching and Injuries in Sports with High Stretch-Shortening Cycle (SSC) Movements

  • Examples: sports like soccer and football require compliant muscle-tendon units for effective energy storage.

  • Insufficient compliance leads to meeting energy demands that surpass muscle-tendon capacity, risking injury.

  • Studies indicate stretching increases tendon viscosity and compliance, potentially preventing injuries in SSC-dominant sports.

4. Stretching and Injuries in Sports with No or Low SSC Movements

  • Examples: jogging, cycling, and swimming rely on active muscle work rather than elastic energy storage.

  • Lower compliance in tendons could be advantageous in these sports, which do not demand high energy absorption.

  • Evidence shows stretching does not significantly reduce injury rates in low SSC sports, contrary to common beliefs.

5. Conclusions

  • Stretching remains a common practice among coaches, yet scientific findings about its effectiveness are mixed.

  • Contradictions in evidence may stem from differing sports activity types.

  • Stiffer tendons may benefit performance in explosive sports, while flexibility may be critical in sports with high SSC.

  • More research needed to clarify the role of stretching in injury prevention across various sports types.