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Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women.
Muscle Nerve. 2015 Nov; 52(5):844-51.MN

Abstract

INTRODUCTION

We examined the effects of neuromuscular fatigue on volitional electromechanical delay (EMD) of leg extensors and flexors between genders.

METHODS

Twenty-one men and 20 women performed 2 maximal voluntary contractions (MVCs), followed by intermittent isometric contractions of leg extensors and flexors using a 0.6 duty cycle (6-s contraction, 4-s relaxation) at 50% of MVC until volitional fatigue was achieved. MVCs were again performed at 0, 7, 15, and 30 min post-fatigue.

RESULTS

EMD was greater compared with baseline at all post-fatigue time phases for the leg flexors (P = 0.001-0.007), while EMD was greater at Post0, Post15 and Post30 (P = 0.001-0.023) for the leg extensors. EMD was also greater for leg extensors compared with leg flexors only at Post0.

CONCLUSION

No differential gender-related fatigue effects on EMD were shown. There were different fatigue-induced responses between leg extensors and flexors, with leg extensors exhibiting higher EMD immediately post-fatigue.

Authors+Show Affiliations

Department of Wellness, Oklahoma State University, Stillwater, Oklahoma, USA.Applied Musculoskeletal and Human Physiology Laboratory, Department of Health and Human Performance, Oklahoma State University, Stillwater, Oklahoma, USA.School of Health Sciences, Kent State University, Kent, Ohio, USA.Applied Musculoskeletal and Human Physiology Laboratory, Department of Health and Human Performance, Oklahoma State University, Stillwater, Oklahoma, USA.Human Performance Laboratory, Department of Health, Exercise and Sport Sciences, Texas Tech University, Lubbock, Texas, 79409, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25664987

Citation

Conchola, Eric C., et al. "Effects of Neuromuscular Fatigue On Electromechanical Delay of the Leg Extensors and Flexors in Young Men and Women." Muscle & Nerve, vol. 52, no. 5, 2015, pp. 844-51.
Conchola EC, Thiele RM, Palmer TB, et al. Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women. Muscle Nerve. 2015;52(5):844-51.
Conchola, E. C., Thiele, R. M., Palmer, T. B., Smith, D. B., & Thompson, B. J. (2015). Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women. Muscle & Nerve, 52(5), 844-51. https://doi.org/10.1002/mus.24598
Conchola EC, et al. Effects of Neuromuscular Fatigue On Electromechanical Delay of the Leg Extensors and Flexors in Young Men and Women. Muscle Nerve. 2015;52(5):844-51. PubMed PMID: 25664987.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of neuromuscular fatigue on electromechanical delay of the leg extensors and flexors in young men and women. AU - Conchola,Eric C, AU - Thiele,Ryan M, AU - Palmer,Ty B, AU - Smith,Doug B, AU - Thompson,Brennan J, Y1 - 2015/09/03/ PY - 2014/10/01/received PY - 2015/01/30/revised PY - 2015/02/04/accepted PY - 2015/2/10/entrez PY - 2015/2/11/pubmed PY - 2016/1/16/medline KW - gender KW - hamstrings KW - neuromuscular fatigue KW - quadriceps KW - recovery SP - 844 EP - 51 JF - Muscle & nerve JO - Muscle Nerve VL - 52 IS - 5 N2 - INTRODUCTION: We examined the effects of neuromuscular fatigue on volitional electromechanical delay (EMD) of leg extensors and flexors between genders. METHODS: Twenty-one men and 20 women performed 2 maximal voluntary contractions (MVCs), followed by intermittent isometric contractions of leg extensors and flexors using a 0.6 duty cycle (6-s contraction, 4-s relaxation) at 50% of MVC until volitional fatigue was achieved. MVCs were again performed at 0, 7, 15, and 30 min post-fatigue. RESULTS: EMD was greater compared with baseline at all post-fatigue time phases for the leg flexors (P = 0.001-0.007), while EMD was greater at Post0, Post15 and Post30 (P = 0.001-0.023) for the leg extensors. EMD was also greater for leg extensors compared with leg flexors only at Post0. CONCLUSION: No differential gender-related fatigue effects on EMD were shown. There were different fatigue-induced responses between leg extensors and flexors, with leg extensors exhibiting higher EMD immediately post-fatigue. SN - 1097-4598 UR - https://www.unboundmedicine.com/medline/citation/25664987/Effects_of_neuromuscular_fatigue_on_electromechanical_delay_of_the_leg_extensors_and_flexors_in_young_men_and_women_ L2 - https://doi.org/10.1002/mus.24598 DB - PRIME DP - Unbound Medicine ER -