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Neuromuscular and Metabolic Responses during Repeated Bouts of Loaded Downhill Walking by Chalchat, Emeric; Siracusa, Julien; Peñailillo, Luis; Malgoyre, Alexandra; Bourrilhon, Cyprien; Charlot, Keyne; Martin, Vincent; Garcia-Vicencio, Sebastian is a scholarly article available to read on EtoBox.

What is Neuromuscular and Metabolic Responses during Repeated Bouts of Loaded Downhill Walking about?

The aim of this study was to compare vastus lateralis (VL) and rectus femoris (RF) muscles for their nervous and mechanical adaptations during two bouts of downhill walking (DW) with load carriage performed two weeks apart. Moreover, we investigated cardio-metabolic and perceived exertion responses during both DW bouts. Methods Seventeen participants performed two 45-min sessions of loaded DW (30% of body mass; slope: -25 %; speed: 4.5 km$\times$h -1 ) separated by two weeks. Rating of perceived exertion (RPE), cost of walking (C w ), heart rate (HR), and EMG activity of thigh muscles were assessed during the DW. Muscle shear elastic modulus ($\mu$) of RF and VL were assessed before each exercise bout. Maximal voluntary contraction (MVC) torque was assessed before (PRE), immediately after (POST), 24 and 48 h after the two exercise bouts. Results MVC torque decreased from POST (-23.7 $\pm$ 9.2%) to 48 h (-19.2 $\pm$ 11.9%) after the first exercise (Ex1), whereas it was significantly reduced only at POST (-14.6 $\pm$ 11.0%) after the second exercise (Ex2) (p < 0.001). RPE (Ex1: 12.3 $\pm$ 1.9; Ex2: 10.8 $\pm$ 2.0), HR (Ex1: 156 $\pm$ 23 bpm; Ex2: 145 $\pm$ 25 bpm), C w (Ex1: 4.5 $\pm

Author

Chalchat, Emeric; Siracusa, Julien; Peñailillo, Luis; Malgoyre, Alexandra; Bourrilhon, Cyprien; Charlot, Keyne; Martin, Vincent; Garcia-Vicencio, Sebastian

Published

2023

Language

EN