M-wave normalization of EMG signal to investigate heat stress and fatigue
Deutscher übersetzter Titel: | M-Wellen-Normalisierung des EMG-Signals zur Untersuchung von Hitzestress und Ermüdung |
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Autor: | Girard, Olivier; Bishop, David J.; Racinais, Sébastien |
Erschienen in: | Journal of science and medicine in sport |
Veröffentlicht: | 21 (2018), 5, S. 518-524, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1440-2440, 1878-1861 |
DOI: | 10.1016/j.jsams.2017.07.020 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201806004059 |
Quelle: | BISp |
Abstract des Autors
Objectives: We examined the extent to which peripheral changes affect EMG signal adjustments during repeated sprinting in temperate and hot conditions.
Design: Randomised, crossover study.
Methods: Ten males performed 10 × 6-s ‘all-out’ cycling sprints (recovery = 30 s) in either a temperate (24 °C/30%rH) or a hot (35 °C/40%rH) environment with concomitant surface EMG recordings of the vastus lateralis (VL) and rectus femoris (RF). In addition, peak-to-peak M-wave amplitudes were obtained for each muscle after each sprint (i.e., 15 s into recovery).
Results: For both the VL and RF muscles RMS decreased across sprint repetitions (P < 0.01), while significantly lower values for the VL (P = 0.012), but not the RF (P = 0.096), occurred in hot vs. temperate conditions. M-wave-normalised RMS for VL muscle decreased across sprint repetitions (P = 0.030), with no condition or interaction effects (both P > 0.621). M-wave-normalised RMS for the RF muscle was lower in the heat (P < 0.034), with no significant sprint or interaction effects (both P > 0.240).
Conclusions: Controlling for changes in maximal M-wave amplitude of the quadriceps muscles after each bout of a repeated cycling exercise in hot and temperate conditions allows researchers to account for fatigue- and/or heat-induced neural and peripheral adjustments.