| Summary: | 碩士 === 輔仁大學 === 體育學系碩士班 === 94 === Regular exercise training benefits physical fitness is well accepted, however, the effect of short-term exercise training on cardiac parasympathetic activity in pupil population is unknown. The purpose of this study was to examine the effect of regular exercise training on cardiovascular control mechanisms in elementary school pupils. Thirty-six healthy pupils were studied and divided into 8 fourth grades (9.75±0.46) and 15 fifth grades (10.40±0.50) sedentary, and 8 fourth grades (9.87±0.35) and 15 fifth grades (9.87±0.35) that joined the track and field team at school. Pupils who joined in the team were not seriously trained in a regular base, but more in fun play type at fourth grade, and 4 days a week, 1 hour per day training schedule was enhanced on fifth grade pupils who were in the team for 6 months.
Heart rate variability (HRV) provides non-invasive information about cardiac parasympathetic activity was evaluated in all four groups of pupils. ECG signals were recorded in supine position for 10 minutes. All data was calculated for the time domain variability indices (mean, standard deviation and coefficient of variation of R-R interval) and frequency domain variables (total power spectrum, high frequency and low frequency, etc.). All subjects were also performed an 800M run for the reference of the cardiorespiratory fitness.
Regular exercise training group showed significantly differences both in time domain and frequency domain when compared to other groups. The means of the R-R interval and its standard deviation (SDRR), the coefficient of variation of R-R interval, the percent of R-R intervals differing > 50 ms from the preceding R-R (PNN50), and the high frequency components of the autoregressive power spectrum of the R-R intervals (HFP) were all significantly higher in the regular exercise training group. The cardiorespiratory fitness level was also significantly higher than other three groups in the regular exercise training group. This data showed and suggested that a half-year of regular exercise training may benefit both of the cardiorespiratory fitness and the cardiac parasympathetic activity in pupil population.
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