Article Dans Une Revue Journal of Electromyography and Kinesiology Année : 2024

Effect of prior neuromuscular electrical stimulation of vastus lateralis on the fatigue induced by a sustained voluntary knee extension in men

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Purpose. The purpose of this study was to investigate the effect of vastus lateralis (VL) selective fatigue induced by neuromuscular electrical stimulation (NMES) on knee extensor electromyographic (EMG) activity during a sustained submaximal isometric contraction. Methods. Thirteen healthy men (28±5 years) completed two experimental sessions in which either the VL was pre-fatigued for 17 min (NMES session) or no intervention was performed (control session, CTRL). Subsequently, participants were asked to sustain an isometric knee extension at 20% of maximal voluntary contraction (MVC) torque until task failure. Results. VL M-wave amplitude was reduced (-34±26%, P=0.008) following the NMES intervention, while MVC torque was reduced by 26±10%. The time to task failure was 23±10% shorter (P=0.002) in NMES (186±75 s) than in CTRL (251±128 s). EMG activity measured during the sustained contraction was higher for vastus medialis and rectus femoris muscles in NMES compared to CTRL (P<0.001), but was comparable for VL (P>0.05). The extent and origin of neuromuscular fatigue at task failure measured through MVCs combined with electrically-evoked contractions did not differ between NMES and CTRL. Conclusion. Compensatory activity from synergist muscles occurred in response to a pre-fatigue intervention, which reduced the time to task failure of a sustained submaximal contraction but did not affect the extent and origin of neuromuscular fatigue.

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hal-05097992 , version 1 (04-06-2025)

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Clément Lanfranchi, Boris Matkowski, Sylvain Rayroud, Alain Martin, Nicola A Maffiuletti, et al.. Effect of prior neuromuscular electrical stimulation of vastus lateralis on the fatigue induced by a sustained voluntary knee extension in men. Journal of Electromyography and Kinesiology, 2024, 79, pp.102942. ⟨10.1016/j.jelekin.2024.102942⟩. ⟨hal-05097992⟩
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