Effect of physical training on heart-period variability in obese children
Effect of physical training on heart-period variability in obese children
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DOI：
10.1016/s0022-3476(97)70280-4
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发表时间：
1997-06-01
影响因子：
5.1
通讯作者：
Treiber, F
中科院分区：
文献类型：
--
作者：
Gutin, B;Owens, S;Treiber, F
目的：心电图间隔的逐搏变异性（RR，即心脏周期变异性）提供了心脏自主活动的信息，可预测动物和成人的心律失常和死亡率。我们确定了体能训练对肥胖儿童心脏周期变异性的影响。方法：35 名受试者被随机分配到体能训练组和对照组，训练包括 4 个月的锻炼，每周 5 天，40 每天分钟，仰卧骑行期间以次最大心率测量心血管健康状况；采用双能吸收法测量体脂百分比；仰卧位测量静息心率变异性参数，计算每个变量训练前到训练后的变化分数，通过比较训练组和对照组的变化来确定训练效果。结果：与对照组相比，训练组（1）降低了次最大心率和体脂百分比（p < 0.01）； (2) 连续差异均方根增加，反映迷走神经张力的时域参数 (p < 0.05)； (3) 低频功率下降，以总功率的百分比表示，总功率是交感神经和迷走神经活动组合的频域指数（p < 0.03）； （4）低频到高频功率（交感-副交感神经平衡指数）下降（p < 0.01）。结论：在肥胖儿童中，体育训练通过降低交感神经与副交感神经活动的比率，有利地改变心脏自主功能。
Objective: The beat-to-beat variability in electrocardiogram intervals (RR, i.e., heart-period variability) provides information on cardiac autonomic activity that predicts arrhythmias and mortality rate in animals and adults, We determined the effect of physical training on heart-period variability in obese children.Methods: Thirty-five subjects were randomly assigned to physical training and control groups, The training involved 4 months of exercise, 5 days per week, 40 minutes per day, Cardiovascular fitness was measured with submaximal heart rate during supine cycling; percentage of body fat was measured with dual-energy absorptiometry; and resting heart-period variability parameters were measured in a supine position, A pretraining to posttraining change score was computed for each variable, The effect of the training was determined by comparing the changes of the training and control groups,Results: Compared with the control group, the trained group (1) reduced submaximal heart rate and percentage of body fat (p < 0.01); (2) increased in the root mean square of successive differences, a time-domain parameter reflective of vagal tone (p < 0.05); (3) decreased in low-frequency power expressed as a percentage of total power, a frequency-domain index of combined sympathetic and vagal activity (p < 0.03); and (4) decreased in the Patio of low- to high-frequency power, an index of sympathetic-parasympathetic balance (p < 0.01),Conclusions: In obese children, physical training alters cardiac autonomic function favorably by reducing the ratio of sympathetic to parasympathetic activity.