Acute effects of static versus dynamic stretching on isometric peak torque, electromyography, and mechanomyography of the biceps femoris muscle

Trent J. Herda, Joel T Cramer, Eric D. Ryan, Malachy P. Mchugh, Jeffrey R. Stout

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The purpose of this study was to examine the acute effects of static versus dynamic stretching on peak torque (PT) and electromyographic (EMG), and mechanomyographic (MMG) amplitude of the biceps femoris muscle (BF) during isometric maximal voluntary contractions of the leg flexors at four different knee joint angles. Fourteen men ((mean ± SD) age, 25 ± 4 years) performed two isometric leg flexion maximal voluntary contractions at knee joint angles of 41°, 61 °, 81 °, and 101 ° below full leg extension. EMG (|xV) and MMG (m·s-2) signals were recorded from the BF muscle while PT values (Nm) were sampled from an isokinetic dynamometer. The right hamstrings were stretched with either static (stretching time, 9.2 ± 0.4 minutes) or dynamic (9.1 ± 0.3 minutes) stretching exercises. Four repetitions of three static stretching exercises were held for 30 seconds each, whereas four sets of three dynamic stretching exercises were performed (12-15 repetitions) with each set lasting 30 seconds. PT decreased after the static stretching at 81° (p = 0.019) and 101° (p = 0.001) but not at other angles. PT did not change (p > 0.05) after the dynamic stretching. EMG amplitude remained unchanged after the static stretching (p > 0.05) but increased after the dynamic stretching at 101° (p < 0.001) and 81° (p < 0.001). MMG amplitude increased in response to the static stretching at 101° (p = 0.003), whereas the dynamic stretching increased MMG amplitude at all joint angles (p < 0.05). These results suggested that the decreases in strength after the static stretching may have been the result of mechanical rather than neural mechanisms for the BF muscle. Overall, an acute bout of dynamic stretching may be less detrimental to muscle strength than static stretching for the hamstrings.

Original languageEnglish (US)
Pages (from-to)809-817
Number of pages9
JournalJournal of strength and conditioning research
Volume22
Issue number3
DOIs
StatePublished - Jan 1 2008

Fingerprint

Muscle Stretching Exercises
Torque
Electromyography
Muscles
Leg
Exercise
Knee Joint
Hamstring Muscles
Muscle Strength

Keywords

  • EMG
  • Hamstrings
  • MMG
  • Stretching-induced force deficit

ASJC Scopus subject areas

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

Cite this

Acute effects of static versus dynamic stretching on isometric peak torque, electromyography, and mechanomyography of the biceps femoris muscle. / Herda, Trent J.; Cramer, Joel T; Ryan, Eric D.; Mchugh, Malachy P.; Stout, Jeffrey R.

In: Journal of strength and conditioning research, Vol. 22, No. 3, 01.01.2008, p. 809-817.

Research output: Contribution to journalArticle

@article{4bd73387132841b99fd9bf0faffd0729,
title = "Acute effects of static versus dynamic stretching on isometric peak torque, electromyography, and mechanomyography of the biceps femoris muscle",
abstract = "The purpose of this study was to examine the acute effects of static versus dynamic stretching on peak torque (PT) and electromyographic (EMG), and mechanomyographic (MMG) amplitude of the biceps femoris muscle (BF) during isometric maximal voluntary contractions of the leg flexors at four different knee joint angles. Fourteen men ((mean ± SD) age, 25 ± 4 years) performed two isometric leg flexion maximal voluntary contractions at knee joint angles of 41°, 61 °, 81 °, and 101 ° below full leg extension. EMG (|xV) and MMG (m·s-2) signals were recorded from the BF muscle while PT values (Nm) were sampled from an isokinetic dynamometer. The right hamstrings were stretched with either static (stretching time, 9.2 ± 0.4 minutes) or dynamic (9.1 ± 0.3 minutes) stretching exercises. Four repetitions of three static stretching exercises were held for 30 seconds each, whereas four sets of three dynamic stretching exercises were performed (12-15 repetitions) with each set lasting 30 seconds. PT decreased after the static stretching at 81° (p = 0.019) and 101° (p = 0.001) but not at other angles. PT did not change (p > 0.05) after the dynamic stretching. EMG amplitude remained unchanged after the static stretching (p > 0.05) but increased after the dynamic stretching at 101° (p < 0.001) and 81° (p < 0.001). MMG amplitude increased in response to the static stretching at 101° (p = 0.003), whereas the dynamic stretching increased MMG amplitude at all joint angles (p < 0.05). These results suggested that the decreases in strength after the static stretching may have been the result of mechanical rather than neural mechanisms for the BF muscle. Overall, an acute bout of dynamic stretching may be less detrimental to muscle strength than static stretching for the hamstrings.",
keywords = "EMG, Hamstrings, MMG, Stretching-induced force deficit",
author = "Herda, {Trent J.} and Cramer, {Joel T} and Ryan, {Eric D.} and Mchugh, {Malachy P.} and Stout, {Jeffrey R.}",
year = "2008",
month = "1",
day = "1",
doi = "10.1519/JSC.0b013e31816a82ec",
language = "English (US)",
volume = "22",
pages = "809--817",
journal = "Journal of Strength and Conditioning Research",
issn = "1064-8011",
publisher = "NSCA National Strength and Conditioning Association",
number = "3",

}

TY - JOUR

T1 - Acute effects of static versus dynamic stretching on isometric peak torque, electromyography, and mechanomyography of the biceps femoris muscle

AU - Herda, Trent J.

AU - Cramer, Joel T

AU - Ryan, Eric D.

AU - Mchugh, Malachy P.

AU - Stout, Jeffrey R.

PY - 2008/1/1

Y1 - 2008/1/1

N2 - The purpose of this study was to examine the acute effects of static versus dynamic stretching on peak torque (PT) and electromyographic (EMG), and mechanomyographic (MMG) amplitude of the biceps femoris muscle (BF) during isometric maximal voluntary contractions of the leg flexors at four different knee joint angles. Fourteen men ((mean ± SD) age, 25 ± 4 years) performed two isometric leg flexion maximal voluntary contractions at knee joint angles of 41°, 61 °, 81 °, and 101 ° below full leg extension. EMG (|xV) and MMG (m·s-2) signals were recorded from the BF muscle while PT values (Nm) were sampled from an isokinetic dynamometer. The right hamstrings were stretched with either static (stretching time, 9.2 ± 0.4 minutes) or dynamic (9.1 ± 0.3 minutes) stretching exercises. Four repetitions of three static stretching exercises were held for 30 seconds each, whereas four sets of three dynamic stretching exercises were performed (12-15 repetitions) with each set lasting 30 seconds. PT decreased after the static stretching at 81° (p = 0.019) and 101° (p = 0.001) but not at other angles. PT did not change (p > 0.05) after the dynamic stretching. EMG amplitude remained unchanged after the static stretching (p > 0.05) but increased after the dynamic stretching at 101° (p < 0.001) and 81° (p < 0.001). MMG amplitude increased in response to the static stretching at 101° (p = 0.003), whereas the dynamic stretching increased MMG amplitude at all joint angles (p < 0.05). These results suggested that the decreases in strength after the static stretching may have been the result of mechanical rather than neural mechanisms for the BF muscle. Overall, an acute bout of dynamic stretching may be less detrimental to muscle strength than static stretching for the hamstrings.

AB - The purpose of this study was to examine the acute effects of static versus dynamic stretching on peak torque (PT) and electromyographic (EMG), and mechanomyographic (MMG) amplitude of the biceps femoris muscle (BF) during isometric maximal voluntary contractions of the leg flexors at four different knee joint angles. Fourteen men ((mean ± SD) age, 25 ± 4 years) performed two isometric leg flexion maximal voluntary contractions at knee joint angles of 41°, 61 °, 81 °, and 101 ° below full leg extension. EMG (|xV) and MMG (m·s-2) signals were recorded from the BF muscle while PT values (Nm) were sampled from an isokinetic dynamometer. The right hamstrings were stretched with either static (stretching time, 9.2 ± 0.4 minutes) or dynamic (9.1 ± 0.3 minutes) stretching exercises. Four repetitions of three static stretching exercises were held for 30 seconds each, whereas four sets of three dynamic stretching exercises were performed (12-15 repetitions) with each set lasting 30 seconds. PT decreased after the static stretching at 81° (p = 0.019) and 101° (p = 0.001) but not at other angles. PT did not change (p > 0.05) after the dynamic stretching. EMG amplitude remained unchanged after the static stretching (p > 0.05) but increased after the dynamic stretching at 101° (p < 0.001) and 81° (p < 0.001). MMG amplitude increased in response to the static stretching at 101° (p = 0.003), whereas the dynamic stretching increased MMG amplitude at all joint angles (p < 0.05). These results suggested that the decreases in strength after the static stretching may have been the result of mechanical rather than neural mechanisms for the BF muscle. Overall, an acute bout of dynamic stretching may be less detrimental to muscle strength than static stretching for the hamstrings.

KW - EMG

KW - Hamstrings

KW - MMG

KW - Stretching-induced force deficit

UR - http://www.scopus.com/inward/record.url?scp=48849091781&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=48849091781&partnerID=8YFLogxK

U2 - 10.1519/JSC.0b013e31816a82ec

DO - 10.1519/JSC.0b013e31816a82ec

M3 - Article

VL - 22

SP - 809

EP - 817

JO - Journal of Strength and Conditioning Research

JF - Journal of Strength and Conditioning Research

SN - 1064-8011

IS - 3

ER -