Viscoelastic stress relaxation in the hamstrings before and after a 10-week stretching program

Muscle Nerve. 2015 May;51(5):761-4. doi: 10.1002/mus.24593. Epub 2015 Mar 27.

Abstract

Introduction: We investigated the viscoelastic stress relaxation response before and after a 10-week hamstrings static stretch program.

Methods: The maximal range of motion (ROMmax ) and maximal torque (Torquemax ) were assessed before and after a 10-week stretching program. Six 30-s static stretches at a predetermined torque were performed, and the relative change in stress relaxation was examined.

Results: ROMmax and Torquemax increased by 53% and 82%, respectively (P < 0.001). The relative stress relaxation (RSR) decreased significantly for repetition 1 when comparing the pretest (25%) and posttest (21%) values (P = 0.003). A significant decrease was also observed for repetitions 2 and 3 (P < 0.014), with no significant difference in repetitions 4-6 (P > 0.056).

Conclusions: Individuals who participated in a 10-week hamstrings passive-static stretch program had a reduced RSR response. A higher stretch intensity or longer duration may be necessary to achieve RSRs similar to those reported before the stretch program.

Keywords: flexibility; hamstrings; passive torque; stress relaxation; stretch.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Elasticity / physiology*
  • Humans
  • Male
  • Muscle Relaxation / physiology*
  • Muscle Stretching Exercises / methods*
  • Muscle, Skeletal / physiology*
  • Range of Motion, Articular / physiology
  • Stress, Physiological / physiology*
  • Tendons / physiology
  • Torque
  • Treatment Outcome
  • Young Adult