Abstract
The investigation is concerned with evaluation of the effect of 12-week aerobic training on the function of the autonomous nervous system in obese subjects. Ten obese middle-aged men trained on a bicycle ergometer for 12 weeks on alternate days for 30-45 minutes at an intensity of 60-75% of the maximal cardiac reserve.
The function of the autonomous nervous system was evaluated by the method of spectral analysis of heart rate variability(short- term) with differentiation of two frequency domains low frequency (Lo 0.0- 0.15 Hz) and high frequency(Hi 0.15-0.5 Hz). The probands were examined before the onset and after termination of the training.
Comparison of values before and after training revealed the statistically significant changes in the following parameters: PL Lo 324.3+-234.1 vs. 629.9+-534.4 (P<0.05),R-R 0.78+-0.09 vs.0.85+-0.09 (P<0.05), CCV Lo 2.10+-0.78 vs. 2.79+-1.O7(P<0.01), CCV Hi in a sitting position 2.13+-0.77 vs. 3.12+-1.45 (P<0.05), CCV in a supine position 2.78+-1.92 vs. 3.57+-1.86 (P<0.05). In the other investigated parameters there was a shift of values in the desirable direction, but the changes were not significant.
The investigation revealed that 12-week aerobic training leads to an increase of the parameters of spectral analysis of variability of the heart rate used for assessment of the function of the autonomous nervous system. Changes were achieved in both components of the system.