Background: The purpose of this study was to compare the 2-hr excess postexercise oxygen consumption (EPOC), respiratory exchange ratio (RER), and rectal temperature (RT) after four-exercise bouts of varying intensity and duration, with and without glucose in milk (GM) ingestion.
Experimental design: subjects completed the exercise tests in random order 4 times on the same weekday. The four experimental exercise conditions were low intensity, long duration with GM (LL & GM), low intensity, long duration without GM (LL & NGM), high intensity, short duration with GM (HS & GM), and high intensity, short duration without GM (HS & NGM).
Participants: ten male college students (20.8 +/- 0.6) yrs participated voluntarily. Measures. Two-way repeated measures ANOVA (exercise condition x time) was used to compare the variables.
Results: Mean EPOC for the 2-hr postexercise period for HS & GM (211.5 ml O2/kg) was significantly greater than EPOC for HS & NGM (154.8 ml O2/kg), LL & GM (140.4 ml O2/kg) and LL & NGM (125.2 ml O2/kg). Mean recovery oxygen uptakes were 6.4, 5.7, 4.5, and 4.2 ml/min/kg with HS & GM, HS & NGM, LL & GM and LL & NGM, respectively. Mean RERs for high intensity exercises were significantly lower than RERs for low intensity exercises during the recovery period. Mean RT for HS & GM (37.60 degrees C) and HS & NGM (37.43 degrees C) were significantly higher than RT for LL & GM (37.19 degrees C) and LL & NGM (37.15 degrees C) during the recovery period.
Conclusion: These results suggest that preexercise intake of GM increases EPOC above that observed in the fasting condition, and high intensity short duration exercise increases fat oxidation during recovery period more than low intensity long duration exercise.