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It has been shown that the time constant of heart rate decline for the first 30 sec (T30) after exercise, at an intensity lower than the ventilatory threshold (VT) , can serve as a specific index to assess post-exercise vagal reactivation. The purpose of this study was to validate the use of a sim pler alternative index, i. e. %•¢ HR30 (the ratio of heart rate decrement for the first 30 sec after exercise) for the evaluation of parasympathetic nervous reactivation, and to examine whether it would be a useful index in the conditioning of athletes. Eighteen college students performed 4 minutes cycle ergometer exercise routines at intensities of 40% , 80% , and 120% VT to compare the %•¢ HR30 and the T30. In addition, the %•¢ HR30 was obtained by a field test (4 minutes jogging) in 15 college middle and long distance runners, every morning during summer camp training to assess the state of athletic conditioning. The %•¢ HR30 at 80% VT was similar to the value at 40% VT, but significantly different from the value at 120% VT, as was the T30 at 80% VT. The %•¢ HR30 significantly correlated with the T30 and VO2max. During the camp, the %•¢ HR30 was higher on mornings following light training days than on mornings following hard training days. These results suggest that the %•¢ HR30, at an exercise intensity lower than the VT, could be a sim ple and useful index to evaluate post-exercise parasympathetic nervous reactivation in the condition ing of athletes. (Jpn. J. Phys. Fitness Sports Med. 1999, 48:467~476) key words: heart rate, parasympathetic nervous system, athletic conditioning

THE SIMPLIFIED EVALUATION OF POST-EXERCISE VAGAL REACTIVATION AND APPLICATION IN ATHLETIC CONDITIONING