ArticleEuropean journal of applied physiology2026
Reliability of M-wave amplitude measurement from paired stimulations across different muscle groups before and after submaximal contraction to failure.
Article in European journal of applied physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeIn exercising humans, contractility is usually investigated using paired/tetanic transcutaneous electrically-evoked contraction, while single stimulations are used to quantify sarcolemmal excitability through M-wave amplitude. Here, we aim at investigating the reliability and validity of M-wave peak-to-peak amplitude and first phase amplitude obtained from paired stimulation compared to those obtained from single stimulation (gold standard) before and after a sustained submaximal isometric contraction of the knee extensor, plantar flexor, elbow flexor and thumb adductor muscles.
methodsM waves, in response to single and paired (10 Hz and 100 Hz) stimuli, were collected in thirteen young, healthy men (25 ± 2 year) before and immediately after an isometric contraction sustained at 50% maximal voluntary force until failure. Lin's concordance correlation coefficient was used to measure the reliability of M-wave parameters obtained from single and paired stimuli.
resultsVariability in the changes in M-wave amplitude was observed following exercise depending on the muscle considered and underscores the need to analyze both phases of the M wave. This study also demonstrates that the M-wave elicited by the first stimulation in a 10-Hz (as opposed to 100-Hz) paired pulse provides an accurate and reliable estimate of sarcolemmal excitability under both resting and fatigued conditions across all investigated muscles.
conclusionWhen using 10-Hz paired stimuli to assess peripheral adjustments, single stimulations may be unnecessary for evaluating sarcolemmal excitability.
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