期刊名称：Applied human science : journal of physiological anthropology
印刷版ISSN：1341-3473
电子版ISSN：1341-3473
出版年度：1999
卷号：18
期号：6
页码：219-223
出版社：日本生理人類学会
其他摘要：The purpose of this study was to evaluate the cardiac autonomic control over mental task under various ambient temperatures (21℃, 28℃ and 35℃). Seven healthy male subjects engaged in the mental tasks, which consisted of distinctive reaction-time tasks. Respiratory coefficient of variation of instantaneous heart rate (CV_), derived from the cross-correlation function between heart rate and respiratory curve, was used as a parameter to assess parasympathetic nervous functions. The difference between total coefficient of variation (CV_) and CV_ was used as a parameter to assess sympathetic nervous functions. The mean heart rate increased at high ambient temperature (35℃) and also during mental task. Both the effects of ambient temperature and task conditions were significant on heart rate, and also on CV_. Moreover, the effects of ambient temperature and task conditions in CV_ were divided into the effect of ambient temperature on CV_ and the effect of task conditions on the difference between CV_ and CV_. These results implied that respiratory modulated parasympathetic activity might control basal the effect of ambient temperature and the other components including sympathetic activity contribute to the increase in heart rate due to mental task. (Appl Human Sci, 18(6): 219-223, 1999)
其他关键词：heart rate variability;autonomic nervous system;cross-correlation function;mental task;ambient temperature
