Abstract des Autors

To examine the influence of increased core (rectal) temperature (TR) on elevated post-exercise oxygen consumption (EPOC), seven male triathletes (Mean VO2max = 4.35 l/min; 57.5 ml/kg/min) swam and cycled at similar intensities and durations. Swimming was used to keep core temperature depressed both during exercise and at the onset of recovery even though exercise intensities and durations were similar to the cycling condition. The subjects volunteered to swim and cycle for 30, 45 and 60 min continuously at 65% VO2max. Oxygen consumption, ventilation, respiratory exchange ratio, and TR were monitored every minute under conditions of resting metabolism, exercise and post-exercise. Post-exercise TR were monitored every minute under conditions of resting metabolism, exercise and post-exercise. As well, the sum of the differences in recovery minus resting TR (SUMTEMPS) was similarly elevated in cycling. EPOC was also increased following cycling versus swimming for each duration, and for cycling for 30 minutes (CY30) versus cycling for 45 minutes and 60 minutes (CY45 and CY60). EPOC was not different across the different swimming durations. A significant correlation was found between EPOC and the SUMTEMPS for cycling (r = 0.68) and swimming (r = 0.69). Therefore, elevated TR is implicated in the increased caloric expenditure following exercise of different durations. Verf.-Referat