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Effect of hamstring stretching on hamstring muscle performance

T W Worrell1, T L Smith, J Winegardner

  • 1Krannert School of Physical Therapy, University of Indianapolis, IN 46227-3697.

The Journal of Orthopaedic and Sports Physical Therapy
|September 1, 1994
PubMed
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Improving hamstring flexibility through stretching enhances hamstring muscle performance under specific isokinetic conditions. Further research is needed for closed kinetic chain activities.

Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • The link between hamstring flexibility and muscle performance remains under-explored.
  • Understanding this relationship is crucial for optimizing athletic training and injury prevention.

Purpose of the Study:

  • To identify the most effective stretching technique for improving hamstring flexibility.
  • To investigate the impact of enhanced hamstring flexibility on isokinetic muscle performance.

Main Methods:

  • Nineteen subjects underwent two stretching protocols: proprioceptive neuromuscular facilitation (PNF) and static stretching.
  • Isokinetic peak torque of hamstring muscles was measured before and after stretching interventions.
  • Statistical analyses included two-way ANOVA for stretching techniques and one-way repeated measures ANOVA for pre- and post-stretching comparisons.

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Main Results:

  • While both static and PNF stretching increased hamstring flexibility (21.3% and 25.7% respectively), these increases were not statistically significant.
  • Significant improvements in hamstring peak torque were observed eccentrically at 60°/sec and 120°/sec, and concentrically at 120°/sec.
  • No significant improvements in concentric peak torque were found at 60°/sec.

Conclusions:

  • Increasing hamstring flexibility is an effective strategy for enhancing hamstring muscle performance under specific isokinetic conditions.
  • Further investigation is required to ascertain the benefits of improved hamstring flexibility on performance in closed kinetic chain exercises.