Effects of stretching on peak torque and the H:Q ratio

P. B. Costa, E. D. Ryan, T. J. Herda, J. M. DeFreitas, T. W. Beck, Joel T. Cramer

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

The purpose of the present study was to examine the acute effects of hamstring and calf stretching on leg extension and flexion peak torque (PT) and the hamstrings-to-quadriceps (H:Q) ratio during maximal, concentric isokinetic muscle actions at 60, 180, and 300° • s-1 in women. Thirteen women (mean age ± SD = 20.8 ± 1.8 yrs; height = 163.0 ± 5.7 cm; mass = 64.0 ± 8.3 kg) performed 3 maximal concentric isokinetic leg extension and flexion muscle actions at 3 randomly ordered angular velocities (60, 180, and 3008 • s-1) before and after a bout of static stretching. The stretching protocol consisted of 1 unassisted and 3 assisted static stretching exercises designed to stretch the posterior muscles of the thigh and leg. Four repetitions of each stretch were held for 30 s with 20 s rest between repetitions. The results indicated that leg flexion PT decreased from pre- to poststretching (34.9 ± 3.5 and 32.4 ± 3.2 Nm, respectively) collapsed across velocity. However, no other changes were observed from pre- to poststretching for leg extension PT (78.5 ± 5.9 and 77.8 ± 5.5 Nm, respectively) and the H:Q ratio (0.47 ± 0.04 and 0.44 ± 0.03, respectively). Our findings suggested that despite the stretching-induced decreases in leg flexion PT, leg extension PT and the H:Q ratios were unaltered by the stretching.

Original languageEnglish (US)
Pages (from-to)60-65
Number of pages6
JournalInternational Journal of Sports Medicine
Volume30
Issue number1
DOIs
StatePublished - Jan 2009

Keywords

  • Injury risk
  • Knee injury
  • Muscle injury
  • Muscle strain
  • Strength
  • Stretching-induced

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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