The effects of acute hot-water immersion on force steadiness and motor unit discharge rate variability in young, healthy adults.

Patrick Rodrigues, Lucas B R Orssatto, Gabriel S Trajano, Lee Wharton, Geoffrey M Minett
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Abstract

This study examined the effects of core and muscle temperature on force steadiness and motor unit discharge rate (MUDR) variability after a hot-water immersion session. Fifteen participants (6 women; 25 ± 6 years) completed neuromuscular assessments before and after either 42 °C (hot) or 36 °C (control) water immersion. Force steadiness was measured during knee extension, while HD-sEMG signals were recorded from vastus lateralis and medialis for MUDR variability analysis. Following water immersion, force steadiness decreased by 0.11% (p < 0.05; d = 0.38) and MUDR variability increased by 1.25% (p < 0.01; d = 0.57) potentially driven by increased muscle temperature. Elevated core temperature did not further affected these changes.

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