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

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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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Abbreviations

AmpliFIRST :

Amplitude of the first phase of the M-wave

AmpliSECOND :

Amplitude of the second phase of the M-wave

AmpliPP :

Amplitude resulting from the sum of AmpliFIRST and AmpliSECOND

AreaFIRST :

Area of the first phase of the M-wave

AreaSECOND :

Area of the second phase of the M-wave

AreaTOTAL :

Area resulting from the sum of AreaFIRST and AreaSECOND

DurFIRST :

Duration of the first phase of the M-wave

DurSECOND :

Duration of the second phase of the M-wave

DurPP :

Time interval between the first and second peaks of the M-wave

MVC:

Maximal voluntary contraction

M-wave:

Compound muscle action potential

SD:

Standard deviation

SE:

Standard error of the mean

EMG:

Electromyography

VL:

Vastus lateralis

VM:

Vastus medialis

RF:

Rectus femoris

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Author contribution

JRF and NP designed experimental study; JRF performed experiments; JRF analyzed data; JRF and NP interpreted results of experiments; JRF drafted manuscript; JRF and NP edited and revised manuscript; JRF and NP approved final version of manuscript.

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Correspondence to Javier Rodriguez-Falces.

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The authors declare that they have no conflict of interest.

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Communicated by Olivier Seynnes.

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Rodriguez-Falces, J., Place, N. Different recoveries of the first and second phases of the M-wave after intermittent maximal voluntary contractions. Eur J Appl Physiol 117, 607–618 (2017). https://doi.org/10.1007/s00421-017-3553-9

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  • DOI: https://doi.org/10.1007/s00421-017-3553-9

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