Burdon et al., found that consuming
cold beverages according to the ACSM guidelines, in euhydrated subjects, enhanced endurance performance in a hot environment [1]. In this study subjects consumed, at each separate trial, a sports drink at the following temperatures and times: 37°C and 4°C consumed every 10 minutes (2.3 mL/kg) and 30 mL ice puree (−1.0°C) every 5 minutes with holding it in the mouth for at least 30 seconds before swallowing during the 90 minute exercise session. Even though this study concluded that there was an improvement in exercise performance with the cold beverage and ice puree, this study has a confounding factor in that it used a sports drink instead of plain water. One could hypothesize that the extra fuel (carbohydrate) and electrolytes GF120918 order acted as ergogenic aids and combined with being cold or alone enhanced performance.
Most studies have addressed a rise in core temperature with a dehydrated population during hot and/or humid conditions over a longer period of time [7, 8]. It is important for the elite and physically fit individuals alike to maintain a normal body temperature GDC0449 (37°C). Some literature suggests that consuming large amounts of cold fluid during exercise would allow the body to have increased Selleckchem PCI32765 capacity to store heat (i.e. heat sink), thereby reducing heat gain during exercise. Seven studies have investigated the effect of beverage temperature on core body temperature during exercise [2, 3, 6–10], however,
the methodologies and protocols vary widely. Four of the seven studies concluded that consuming a cold beverage during exercise resulted in a lower core temperature at the end of the exercise session compared to consuming a warm beverage. Our study was unique in that at the time the trial started there had not been a published paper on the effects of COLD vs. RT water during a traditional exercise session (60 minutes) in physically GNE-0877 fit individuals, in a moderate climate. No studies have investigated the effect of cold water on thermoregulation and a traditional exercise session combining both strength and endurance training in physically fit individuals. In our study we found that while ingesting the COLD water, subjects were able to significantly mediate their rise in core temperature over the entire duration of the study (ie, when comparing the magnitude of the change in core temperature, subjects who drank COLD water had a significantly lower change in core body temperature than subjects who drank RT water (p=0.024)). Subjects finished their water allotment at the end of the exercise session before commencing the performance tests and the core temperature mediation continued in the COLD trial through the end of the performance tests (p=0.024). Although there was not a statistically significant improvement in the broad jump or TTE performance tests while drinking the cold water, approximately 50% of the subjects performed better during the COLD trial in both tests.