67238
document
Physical and perceptual cooling with beverages to increase cycle performance in a tropical climate . PURPOSE This study compares the effects of neutral temperature , cold and ice-slush beverages , with and without 0.5 % menthol on cycling performance , core temperature ( Tco ) and stress responses in a tropical climate ( hot and humid conditions ) . METHODS Twelve trained male cyclists/triathletes completed six 20-km exercise trials against the clock in 30.7°C±0.8°C and 78 % ±0.03 % relative humidity . Before and after warm-up , and before exercise and every 5 km during exercise , athletes drank 190 mL of either aromatized ( i.e. , with 0.5 mL of menthol ( 5 gr/L ) ) or a non-aromatized beverage ( neutral temperature : 23°C±0.1°C , cold : 3°C±0.1°C , or ice-slush : -1°C±0.7°C ) . During the trials , heart rate ( HR ) was continuously monitored , whereas core temperature ( Tco ) , thermal comfort ( TC ) , thermal sensation ( TS ) and rate of perceived exertion ( RPE ) were measured before and after warm-up , every 5 km of exercise , and at the end of exercise and after recovery . RESULTS Both the beverage aroma ( P < 0.02 ) and beverage temperature ( P < 0.02 ) had significant and positive effects on performance , which was considerably better with ice-slush than with a neutral temperature beverage , whatever the aroma ( P < 0.002 ) , and with menthol vs non-menthol ( P < 0.02 ) . The best performances were obtained with ice-slush/menthol and cold/menthol , as opposed to neutral/menthol . No differences were noted in HR and Tco between trials . CONCLUSION Cold water or ice-slush with menthol aroma seems to be the most effective beverage for endurance exercise in a tropical climate . Further studies are needed to explore its effects in field competition .
67239
Intervention_Physical
Physical and perceptual cooling with beverages
67240
Intervention_Physical
neutral temperature , cold and ice-slush beverages , with and without 0.5 % menthol
67241
Outcome_Physical
cycling performance , core temperature ( Tco ) and stress responses
67242
Outcome_Physical
heart
67243
Outcome_Physical
monitored , whereas core temperature ( Tco ) , thermal comfort ( TC ) , thermal sensation ( TS ) and rate of perceived exertion