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

Rodriguez‐Falces, Javier; Place, Nicolas

doi:10.1007/s00421-017-3553-9

Eur J Appl Physiol

2017

DOI: 10.1007/s00421-017-3553-9

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

Javier Rodriguez‐Falces

Nicolas Place

Abstract: 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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2024

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Cited by 1 publication

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The first and second phases of the muscle compound action potential in the thumb are differently affected by electrical stimulation trains

Lanfranchi,

Rodriguez-Falces,

Place

2024

Journal of Applied Physiology

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Sarcolemmal membrane excitability is often evaluated by considering the peak-to-peak amplitude of the compound muscle action potential (M-wave). However, the first and second M-wave phases represent distinct properties of the muscle action potential, which are differentially affected by sarcolemma properties and other factors such as muscle architecture. Contrasting with previous studies in which voluntary contractions have been used to induce muscle fatigue, we employed repeated electrically-induced tetanic contractions of the adductor pollicis muscle and assessed the kinetics of M-wave properties during the course of the contractions. Eighteen participants (25±6 years) underwent 30 electrically-evoked tetanic contractions delivered at 30Hz, each lasting 3s with 1s intervals. We recorded the amplitudes of the first and second M-wave phases for each stimulation. During the initial stimulation train, the first and second M-wave phases exhibited distinct kinetics. The first phase amplitude showed a rapid decrease to reach ~59% of its initial value (p<0.001), whereas the second phase amplitude displayed an initial transient increase of ~19% (p = 0.007). Within subsequent trains, both the first and second phase amplitudes consistently decreased as fatigue developed with a reduction during the last train reaching ~47% of its initial value (p<0.001). Analysing the first M-wave of each stimulation train unveiled different kinetics for the first and second phases during the initial trains, but these distinctions disappeared as fatigue progressed. These findings underscore the interplay of factors affecting the M-wave and emphasize the significance of separately scrutinizing its first and second phases when assessing membrane excitability adjustments during muscle contractions.

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The first and second phases of the muscle compound action potential in the thumb are differently affected by electrical stimulation trains

Lanfranchi,

Rodriguez-Falces,

Place

2024

Journal of Applied Physiology

View full text Add to dashboard Cite

show abstract

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

Cited by 1 publication

References 38 publications

The first and second phases of the muscle compound action potential in the thumb are differently affected by electrical stimulation trains

The first and second phases of the muscle compound action potential in the thumb are differently affected by electrical stimulation trains

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