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Purpose <p>To investigate the effects of water availability on neuromuscular performance of non-exercising muscles during loaded marching in the heat.</p> Methods <p>Ten physically active adults (7 men, 3 women; age 27.4 ± 6.8 y; body mass 76.6 ± 9.3&#xa0;kg; V̇O<sub>2peak</sub> 58.6 ± 12.7&#xa0;ml·kg⁻¹·min⁻¹) completed 2 × 60&#xa0;min discontinuous loaded marches (3 × 20&#xa0;min) in ~ 30&#xa0;°C, ~ 60% RH while carrying ~ 10% body mass. Mean marching intensity was ~ 68% HRmax. In one trial, consumed water was <i>ad libitum</i> (DRINK); in the other, water was withheld (NO DRINK). Hydration, heart rate (HR), and thermoregulatory responses (heart rate, core and mean skin temperature) were monitored. Neuromuscular performance of non-exercising muscles (handgrip strength, bite force), thermal sensation (<i>TS</i>), and rating of perceived exertion (RPE) were assessed pre, during, and post march.</p> Results <p>Percentage body-mass loss was 0.9% (DRINK) vs. 1.6% (NO DRINK; <i>p</i> &gt; 0.05). Sweat rate was higher in DRINK (1.61 ± 0.36 vs. 1.22 ± 0.21&#xa0;l·h⁻¹; <i>p</i> = 0.006). HR and core temperature rose with workload but did not differ between conditions. <i>TS</i> and RPE were higher in NO DRINK with elevated blood lactate (<i>p</i> &lt; 0.05). Handgrip declined across trials (~ 7%, non-significant), and bite force was unchanged (<i>p</i> &gt; 0.38).</p> Conclusion <p>Withholding water during a 1&#xa0;h loaded march in heat, TS and RPE but did not impair cardiovascular, thermoregulatory, or the neuromuscular performance of non-exercising muscles. Under these conditions, water restriction did not compromise non-exercising muscle function despite greater perceived effort.</p>

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Fluid availability, fatigue, and inhibition: neuromuscular responses of non-exercised skeletal muscle to load carriage in the heat

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Benjamin Cooke,
  • Michael Chang,
  • Alexander F Marino,
  • Frank E Marino

摘要

Purpose

To investigate the effects of water availability on neuromuscular performance of non-exercising muscles during loaded marching in the heat.

Methods

Ten physically active adults (7 men, 3 women; age 27.4 ± 6.8 y; body mass 76.6 ± 9.3 kg; V̇O2peak 58.6 ± 12.7 ml·kg⁻¹·min⁻¹) completed 2 × 60 min discontinuous loaded marches (3 × 20 min) in ~ 30 °C, ~ 60% RH while carrying ~ 10% body mass. Mean marching intensity was ~ 68% HRmax. In one trial, consumed water was ad libitum (DRINK); in the other, water was withheld (NO DRINK). Hydration, heart rate (HR), and thermoregulatory responses (heart rate, core and mean skin temperature) were monitored. Neuromuscular performance of non-exercising muscles (handgrip strength, bite force), thermal sensation (TS), and rating of perceived exertion (RPE) were assessed pre, during, and post march.

Results

Percentage body-mass loss was 0.9% (DRINK) vs. 1.6% (NO DRINK; p > 0.05). Sweat rate was higher in DRINK (1.61 ± 0.36 vs. 1.22 ± 0.21 l·h⁻¹; p = 0.006). HR and core temperature rose with workload but did not differ between conditions. TS and RPE were higher in NO DRINK with elevated blood lactate (p < 0.05). Handgrip declined across trials (~ 7%, non-significant), and bite force was unchanged (p > 0.38).

Conclusion

Withholding water during a 1 h loaded march in heat, TS and RPE but did not impair cardiovascular, thermoregulatory, or the neuromuscular performance of non-exercising muscles. Under these conditions, water restriction did not compromise non-exercising muscle function despite greater perceived effort.