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European Journal of Applied Physiology

Erschienen in:

01.09.2013 | Original Article

Effects of neuromuscular fatigue on the electromechanical delay of the leg extensors and flexors in young and old men

verfasst von: E. C. Conchola, B. J. Thompson, D. B. Smith

Erschienen in: European Journal of Applied Physiology | Ausgabe 9/2013

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Abstract

Purpose

The purpose of this study was to investigate the effects of a fatigue-inducing bout of submaximal, intermittent isometric contractions on the electromechanical delay (EMD) of the leg extensors and flexors in young and old men.

Methods

Twenty young (mean ± SD: age = 25 ± 2.8 years) and sixteen old (age = 70.8 ± 3.8) recreationally active men performed maximal voluntary contractions (MVCs) followed by a fatigue-inducing protocol consisting of intermittent isometric contractions of the leg extensors or flexors using a 0.6 duty cycle (6 s contraction, 4 s relaxation) at 60 % of MVC until volitional fatigue. MVCs were again performed at 0, 7, 15, and 30 min post fatigue. A three-way mixed factorial ANOVA was used to analyze the EMD data.

Results

There was a two-way muscle × time interaction (P = 0.039) where the EMD of the leg flexors was greater (P = 0.001–0.034) compared with baseline at all post fatigue time periods, but was only greater at immediately post fatigue for the extensors (P = 0.001). A significant two-way interaction for muscle × age (P = 0.009) revealed that the EMD was greater (P = 0.003) for the extensors for the old compared with the young men, but not different for the flexors (P = 0.506).

Conclusions

These findings showed differential fatigue-induced EMD recovery patterns between the leg extensors and flexors with the flexors being slower to recover and also that age-related increases of EMD are muscle group specific. The sustained increased EMD of the flexors during recovery may have important injury and performance implications in a variety of populations and settings.

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Titel: Effects of neuromuscular fatigue on the electromechanical delay of the leg extensors and flexors in young and old men
verfasst von: E. C. Conchola
B. J. Thompson
D. B. Smith
Publikationsdatum: 01.09.2013
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 9/2013
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-013-2675-y

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Abstract

Purpose

Methods

Results

Conclusions

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