Abstract
Purpose
Neuromuscular electrical stimulation (NMES) with large electrodes and multiple current pathways (m-NMES) has recently been proposed as a valid alternative to conventional NMES (c-NMES) for quadriceps muscle (re)training. The main aim of this study was to compare discomfort, evoked force and fatigue between m-NMES and c-NMES of the quadriceps femoris muscle in healthy subjects.
Methods
Ten healthy subjects completed two experimental sessions (c-NMES and m-NMES), that were randomly presented in a cross-over design. Maximal electrically evoked force at pain threshold, self-reported discomfort at different levels of evoked force, and fatigue-induced force declines during and following a series of 20 NMES contractions were compared between c-NMES and m-NMES.
Results
m-NMES resulted in greater evoked force (P < 0.05) and lower discomfort in comparison to c-NMES (P < 0.05–0.001), but fatigue time course and magnitude did not differ between the two conditions.
Conclusions
The use of quadriceps m-NMES appears legitimate for (re)training purposes because it generated stronger contractions and was less discomfortable than c-NMES (due to multiple current pathways and/or lower current density with larger electrodes).
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Abbreviations
- c-NMES:
-
Conventional neuromuscular electrical stimulation
- m-NMES:
-
Multipath neuromuscular electrical stimulation
- MVC:
-
Maximal voluntary contraction
- NMES:
-
Neuromuscular electrical stimulation
- SD:
-
Standard deviation
- VAS:
-
Visual analogue scale
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Acknowledgments
The authors thank Bio-Medical Research Ltd. (Galway, Ireland) for logistical support during the experimental phase of the study.
Conflict of interest
The authors declare no conflict of interest regarding this study.
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Communicated by Toshio Moritani.
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Maffiuletti, N.A., Vivodtzev, I., Minetto, M.A. et al. A new paradigm of neuromuscular electrical stimulation for the quadriceps femoris muscle. Eur J Appl Physiol 114, 1197–1205 (2014). https://doi.org/10.1007/s00421-014-2849-2
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DOI: https://doi.org/10.1007/s00421-014-2849-2