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Exerc Sci > Volume 21(2); 2012 > Article
Exercise Science 2012;21(2): 173-182. doi: https://doi.org/10.15857/ksep.2012.21.2.173
운동 프로그램이 비만 청소년의 자율신경계 기능에 미치는 영향
윤은선1, 박수현2, 정수진1, 제세영2
Effects of exercise program on autonomic nervous system activity in obese adolescents.
It is well known that autonomic nervous system activity is related with increasing risk of cardiovascular disease. The purpose of this study was to assess the effects of obesity and exercise on autonomic nervous system activity in obese adolescents. Twenty obese adolescents(13±0.5 year, 30.09±2.75 ㎏/㎡) were compared with 10 heathy normal weight subjects(13±0.5 year, 20.16±2.87 ㎏/㎡), twenty obese adolescents were randomly assigned to an exercise group(n=10) and control group(n=10). Exercise group participated in a 12 weeks school-based exercise program(60-90 min/day, 3 days/week). Autonomic nervous system activity were measured using heart rate variability(HRV) and heart rate recovery, Heart rate recovery was defined as the difference between heart rate at peak exercise test and 1, 2 minute later. Frequency domain(HFnu:High frequency normalized units, LFnu:Low frequency normalized units, LF/HF ratio and time domain(RMSSD:Root Mean Square of the Difference of Successive R to R Intervals,NN50:Number of successive NN intervals which differ by more than 50 ms, pNN50:Percentage of consecutive R to R Intervals differing by more than 50 ms) of HRV were calculated. Obese group showed a significant decrease HFnu and increase LFnu, LF/HF ratio which of the HRV compared to normal weight group. pNN50 was significant decrease in obese group. There were significant decrease in body weight (p=0.001), % body fat (p=0.004), waist circumference (p=0.001) and increase in cardiorespiratory fitness (p=0.001) after 12 weeks exercise program. NN50, pNN50, RMSSD, HFnu which component of parasympathetic nervous system activity increased in exercise group,but changes of between group were not statistically significant. These data indicate that obese adolescents had decreased parasympathetic nervous system activity and 12 weeks exercise program dose not affect autonomic nervous system activity improvements in obese adolescents.
Key words: Autonomic nervous system activity, Exercise, Obese adolescents.
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