tailieunhanh - Báo cáo y học: " Comparative effects of selected non-caffeinated rehydration sports drinks on short-term performance following moderate dehydration"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Comparative effects of selected non-caffeinated rehydration sports drinks on short-term performance following moderate dehydration | Snell et al. Journal of the International Society of Sports Nutrition 2010 7 28 http content 7 1 28 jissn journal of the onal society of sports nutrition RESEARCH ARTICLE Open Access Comparative effects of selected non-caffeinated rehydration sports drinks on short-term performance following moderate dehydration Dator re Cno 111 yA rd2 r Hii HiTif i M rìMTictA Timi3 I Qfmhc4 reter G Snell Robert VVdlU Cllitlian Kandaswami Sidney J Stuns Abstract Background The effect of moderate dehydration and consequent fluid replenishment on short-duration maximal treadmill performance was studied in eight healthy fit VO2max mL kg-1 min-1 males aged 28 yrs. Methods The study involved a within subject blinded crossover placebo design. Initially all subjects performed a baseline exercise test using an individualized treadmill protocol structured to induce exhaustion in 7 to 10 min. On each of the three subsequent testing days the subjects exercised at 70-75 VO2max for 60 min at 29-33 C resulting in a dehydration weight loss of body weight. After 60 min of rest and recovery at 22 C subjects performed the same treadmill test to voluntary exhaustion which resulted in a small reduction in VO2max and a decline in treadmill performance by 3 relative to the baseline results. Following another 60 min rest and recovery subjects ingested the same amount of fluid lost in the form of one of three lemon-flavored randomly assigned commercial drinks namely Crystal Light placebo control Gatorade and Rehydrate Electrolyte Replacement Drink and then repeated the treadmill test to voluntary exhaustion. Results VO2max returned to baseline levels with Rehydrate while there was only a slight improvement with Gatorade and Crystal Light. There were no changes in heart rate or ventilation with all three different replacement drinks. Relative to the dehydrated state a decrease in treadmill performance time occurred with Crystal Light while replenishment with Gatorade