Development of Child Cardiac Vagal Tone
2 ~ 6岁儿童心迷走紧张的发展

In this study,Cardiac vagal tone and heart period were measured in a sample of 104 children(aged 2,4,and 6) to evaluate the development of vagal regulation at rest and during age-appropriate mild stress task.The development patterns of child baseline vagal tone and child vagal suppression were different:(1) Child baseline vagal tone increased with age in early childhood.The baseline vagal tone of 4 years and 6 years were significantly higher than that of 2 years,but there was no significant difference between that of 4 years and 6 years.Child baseline heart period increased with age.(2)Child vagal suppression didn't increase with age.Child baseline-to-task change in heart period of 6 years was significantly higher than that of 2 years,and there were no differences between those of other groups.