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

35 Citations (Scopus)

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 1 2009

Fingerprint

Torque
Leg
Muscle Stretching Exercises
Muscles
Thigh
Exercise

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

Cite this

Effects of stretching on peak torque and the H:Q ratio. / Costa, P. B.; Ryan, E. D.; Herda, T. J.; DeFreitas, J. M.; Beck, T. W.; Cramer, Joel T.

In: International Journal of Sports Medicine, Vol. 30, No. 1, 01.01.2009, p. 60-65.

Research output: Contribution to journalArticle

Costa, P. B. ; Ryan, E. D. ; Herda, T. J. ; DeFreitas, J. M. ; Beck, T. W. ; Cramer, Joel T. / Effects of stretching on peak torque and the H:Q ratio. In: International Journal of Sports Medicine. 2009 ; Vol. 30, No. 1. pp. 60-65.
@article{58644e07475446e1a3360919e707ee1b,
title = "Effects of stretching on peak torque and the H:Q ratio",
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.",
keywords = "Injury risk, Knee injury, Muscle injury, Muscle strain, Strength, Stretching-induced",
author = "Costa, {P. B.} and Ryan, {E. D.} and Herda, {T. J.} and DeFreitas, {J. M.} and Beck, {T. W.} and Cramer, {Joel T.}",
year = "2009",
month = "1",
day = "1",
doi = "10.1055/s-2008-1038738",
language = "English (US)",
volume = "30",
pages = "60--65",
journal = "International Journal of Sports Medicine",
issn = "0172-4622",
publisher = "Georg Thieme Verlag",
number = "1",

}

TY - JOUR

T1 - Effects of stretching on peak torque and the H:Q ratio

AU - Costa, P. B.

AU - Ryan, E. D.

AU - Herda, T. J.

AU - DeFreitas, J. M.

AU - Beck, T. W.

AU - Cramer, Joel T.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - 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.

AB - 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.

KW - Injury risk

KW - Knee injury

KW - Muscle injury

KW - Muscle strain

KW - Strength

KW - Stretching-induced

UR - http://www.scopus.com/inward/record.url?scp=61549122422&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=61549122422&partnerID=8YFLogxK

U2 - 10.1055/s-2008-1038738

DO - 10.1055/s-2008-1038738

M3 - Article

C2 - 18651372

AN - SCOPUS:61549122422

VL - 30

SP - 60

EP - 65

JO - International Journal of Sports Medicine

JF - International Journal of Sports Medicine

SN - 0172-4622

IS - 1

ER -