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Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test
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Hypohydration Decreases Neuromuscular Performance before and after Intermittent Exercise in the Heat.

Kelly B Elliott1, Marcos S Keefe1, Ryan A Dunn1

  • 1Department of Kinesiology and Sport Management, Sports Performance Laboratory, Texas Tech University, Lubbock, TX.

Medicine and Science in Sports and Exercise
|January 23, 2026
PubMed
Summary
This summary is machine-generated.

Hypohydration negatively impacts athletic performance. Dehydration in heat reduced muscle size, strength, and coordination in soccer players, affecting their ability to perform.

Keywords:
BODY FLUID BALANCEDEHYDRATIONHYDRATION STATUSMUSCLE MORPHOLOGYNEURAL FUNCTION

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Human Performance

Background:

  • Hydration status is crucial for optimal physiological function and athletic performance.
  • Intermittent exercise in hot environments poses significant challenges to thermoregulation and performance.
  • Understanding the effects of dehydration on neuromuscular function is vital for athletes training and competing in the heat.

Purpose of the Study:

  • To investigate the impact of hypohydration on neuromuscular performance in male soccer players.
  • To assess changes in muscle morphology and function before and after intermittent exercise in heat under euhydrated and hypohydrated conditions.

Main Methods:

  • Eleven male soccer players underwent testing in euhydrated (EUH) and hypohydrated (HYP) states.
  • Neuromuscular assessments included ultrasound for muscle size (CSA, thickness), Landing Error Scoring System (LESS), and isometric knee extensions (rate of torque development).
  • Participants completed intermittent exercise in heat (33°C), with hydration status monitored via urine specific gravity (USG), urine osmolality, and body mass loss (BML).

Main Results:

  • Hypohydration led to smaller rectus femoris cross-sectional area (CSA) and muscle thickness compared to euhydration.
  • Higher LESS scores in the hypohydrated state indicated poorer motor control and increased injury risk.
  • Reduced rate of torque development (RTD) at multiple time intervals was observed in hypohydrated athletes.
  • Markers of hydration (USG, urine osmolality, BML) confirmed significant dehydration in the HYP trial.

Conclusions:

  • Hypohydration significantly impairs neuromuscular performance, including muscle size and strength, in soccer players.
  • Dehydration negatively affects motor control and increases the risk of injury during intermittent exercise in the heat.
  • Maintaining euhydration is critical for athletes to optimize performance and safety when exercising in hot conditions.