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Advese Effects Of Exercising In Hot Conditions

650 words - 3 pages

It is well established that exercising in hot conditions can adversely affect endurance exercise capacity (Altareki, Drust, Atkinson, Cable and Gregson, 2009) and is also associated with an augmented rise in core temperature (Tc), increased risk of exercise-induced hypohydration (Kay & Marino, 2000) and can increase the risk of heat related illness, such as heat exhaustion and heat stroke (Wendt, Loon & Lichtenbelt, 2007). To mitigate these detrimental effects, powerful physiological mechanisms are evoked, including cutaneous vasodilation and whole body sweating which facilitates enhanced heat dissipation into the surrounding environment (Charkoudian, 2003).
The rise in sweat production that is observed during exercise can cause disturbances in body water and electrolyte balance, which in turn can lead to hypohydration (Rodriguez, DiMarco and Langley, 2009). Even a small amount of fluid loss (1% bm) can increase cardiovascular strain as indicated by a disproportionate elevation of heart rate during exercise, and can limit the ability of the body to transfer heat from contracting muscles to the skin surface (Casa, 1999). Therefore, consequences of body water deficits may impair exercise performance. In such situations, hypohydration is usually inhibited by increases in thirst-driven drinking (Marish et al., 2004). Although this thirst response may not sufficiently promote fluid intake to maintain fluid balance (Greenleaf, 1992), present guidelines from the American College of Sports Medicine (ACSM) recommend that during exercise, individuals should drink to prevent a >2% body weight loss from water deficit (Sawka et al., 2007).
Previous research investigating the optimal drink temperature to consume during exercise have predominantly focused on temperatures below 37°C, as beverages cooler than core body temperature are thought to be more effective at alleviating the thermal burden associated with exercise in the heat (Burdon et al., 2010). Lee and Shirreffs (2007) investigated the effects of fluid temperature on thermoregulatory responses (i.e. sweating, elevations in skin temperature and subsequent elevations in body core temperature) during exercise. The...

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