chapter  9
Fluid, Electrolytes and Hydration Needs of Masters Athletes
Pages 12

Hydration is an often overlooked nutritional factor that can influence exercise performance, particularly endurance exercise in the heat. It is commonly considered that a loss of only 2%–3% body water (BW) due to dehydration leads to exercise performance decrements [1], although any amount of dehydration can impair temperature regulation mechanisms in the body [2]. The effects of dehydration on thermoregulation can cause detrimental health outcomes, including impaired cognitive and cardiovascular functions and associated heat illness [3]. The effects of dehydration are not limited to masters athletes, but age-related fluid changes such as intra-cellular water loss compared to extra-cellular fluid losses during body water loss pose increased health and performance risks among older athletes [4,5].