The importance of good hydration for work and exercise performance

Area of Science:

• Sports Science
• Exercise Physiology
• Environmental Physiology

Background:

• Whole-body hydration status significantly impacts physical performance across various exercise types.
• Existing research predominantly focuses on endurance, with less emphasis on power, strength, and skill-based activities.

Purpose of the Study:

• To review and synthesize published literature on the effects of hydration status on power, strength, and sporting skills performance.
• To consolidate current understanding of how dehydration influences different facets of athletic performance.

Main Methods:

• Systematic literature review of studies investigating hydration and exercise performance.
• Analysis of data pertaining to endurance, power, strength, and skill-based sporting activities.
• Consideration of environmental factors, particularly temperature, in relation to dehydration effects.

Main Results:

• Dehydration up to 2% of body mass may not significantly impair performance in cold or temperate conditions for some individuals.
• In hot environments (≥30°C), a 2% body mass loss due to dehydration demonstrably impairs exercise performance.
• Dehydration in hot conditions elevates the risk of heat-related injuries.

Conclusions:

• Hydration status is a critical determinant of exercise performance, with varying tolerance levels depending on environmental conditions.
• Athletes exercising in heat are particularly vulnerable to performance decrements and heat injury when dehydrated.
• Further research may be warranted to explore individual variability in dehydration tolerance across different exercise modalities.