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European Journal of Applied Physiology

Erschienen in:

22.02.2017 | Original Article

Different recoveries of the first and second phases of the M-wave after intermittent maximal voluntary contractions

verfasst von: Javier Rodriguez-Falces, Nicolas Place

Erschienen in: European Journal of Applied Physiology | Ausgabe 4/2017

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Abstract

Purpose

We investigated the recovery of muscle electrical properties after intermittent intense exercise by examining separately the first and second phases of the muscle compound action potential (M-wave).

Methods

M-waves and mechanical twitches were obtained using femoral nerve stimulation throughout the 30-min recovery period following 48 successive intermittent 3-s MVCs. The amplitude, duration, and area of the M-wave first and second phases, and the peak twitch force were measured from the knee extensors.

Results

The amplitudes of both the first and second M-wave phases were increased immediately after exercise (P < 0.05), but, whereas the first phase remained enlarged for 5 min after exercise, the increase of the second phase only lasted for 10 s. After 30 min of recovery, the amplitude, area, and duration of both the first and second phases were decreased compared to control values (10–20%, P < 0.05). A significant temporal association was found between the changes in the amplitude and duration of the M-wave first phase (maximal cross correlations, 0.9–0.93; time lag, 0 s). A significant, negative temporal relation was found between the amplitude of the M-wave first phase and the peak twitch force during recovery (P < 0.05).

Conclusions

The prolonged enlargement of the M-wave first phase during recovery seems primarily related to fatigue-induced changes in membrane properties, whereas the extremely short recovery of the second phase might be related to changes in muscle architectural features. It is concluded that muscle excitability is impaired even after intermittent fatiguing contractions which allow partial clearance of extracellular K⁺.

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Titel: Different recoveries of the first and second phases of the M-wave after intermittent maximal voluntary contractions
verfasst von: Javier Rodriguez-Falces
Nicolas Place
Publikationsdatum: 22.02.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 4/2017
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-017-3553-9

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Abstract

Purpose

Methods

Results

Conclusions

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