TY  - JOUR
PY  - 2023//
TI  - Neural adjustments during repeated braking and throttle actions on a motorcycle setup
JO  - International journal of sports medicine
A1  - Marina, Michel
A1  - Torrado, Priscila
A1  - Duchateau, Jacques
A1  - Baudry, Stéphane
SP  - ePub
EP  - ePub
VL  - ePub
IS  - ePub
N2  - The aim of the study was to assess neuromuscular changes during an intermittent fatiguing task designed to replicate fundamental actions and ergonomics of road race motorcycling. Twenty-eight participants repeated a sequence of submaximal brake-pulling and gas throttle actions, interspaced by one maximal brake-pulling, until failure. During the submaximal brake-pulling actions performed at 30% MVC, force fluctuations, surface EMG, maximal M-wave (M(max)) and H-reflex were measured in the flexor digitorum superficialis. At the end of the task, the MVC force and associated EMG activity decreased (P<0.001) by 46% and 26%, respectively. During the task, force fluctuation and EMG activity increased gradually (106% and 61%, respectively) with respect to the pre-fatigue state (P≤0.029). The M(max) first phase did not change (P≥0.524), whereas the H-reflex amplitude, normalized to M(max), increased (149%; P≤0.039). Noteworthy, the relative increase in H-reflex amplitude was correlated with the increase in EMG activity during the task (r=0.63; P<0.001). During the 10-min recovery, MVC force and EMG activity remained depressed (P≤0.05) whereas H-reflex amplitude and force fluctuation returned to pre-fatigue values. In conclusion, contrarily to other studies, our results bring forward that when mimicking motorcycling brake-pulling and gas throttle actions, supraspinal neural mechanisms primarily limit the duration of the performance.<p />  <p>Language: en</p>
LA  - en
SN  - 0172-4622
UR  - http://dx.doi.org/10.1055/a-2197-0967
ID  - ref1
ER  -