短臂离心机训练时男女心血管反应的比较

Comparison of males and females in cardiovascular responses during short arm centrifuge training

目的比较男性和女性在短臂离心机(SAC)训练过程中心血管反应的变化。方法 12名男性与12名女性被试者均连续完成不转头和间断两次左右转头45度人体SAC暴露,足水平2 Gz,分别持续4 min,记录实验过程中被试者血压、心率等变化并进行心率变异性分析,同时进行前庭症状评价。结果在SAC暴露或复合前庭刺激时,男女被试者心率、舒张压、心率变异性低频功率(LF)、低频功率/高频功率(LF/HF)较暴露前均显著升高(P <0. 05)。女性被试者单独SAC暴露时的LF/HF变化率显著高于男性(P <0. 05)。与单独SAC暴露相比,SAC暴露复合前庭刺激时男性的LF/HF显著升高(P <0. 05)。结论 SAC暴露可以明显提高男性和女性心脏交感神经兴奋性,与男性相比较,女性对离心机暴露更敏感,更容易引起自主神经功能的变化。

AIM To observe the effects of vestibular stimulation by head movement on cardio vascular functions during shortLarm centrifugation.METHODS Twelve men and twelve women subjects were exposed to short-arm centrifuge of 2Gz at feet level for 8 minutes,with head still and intermittent head-turns continuously.Heart rate,blood pressure and heart rate variability ('HRV)were measured and vestibular function was evaluated during the exposure.RESULTS Compared with those pre-exposure,the heart rate,diastolic pressure,low frequency of HRV and ratio of low frequency to high h'equency (LF/HF) decreased significantly in subjects with head-turns during short-arm centrifugation.When the subjects were exposed to short-arm centrifugation,the rate of LF/HF change of women was significantly higher than men.The LH/HF significantly increased in men with head-turns compared with those in the subjects with the head still during short-arm centrifugation.CONCLUSION The exposure of short-arm centrifuge significantly enhances the sympathetic excitability in male and female subjects.Compared with men,women may be more sensitive to centrifuge exposure and more likely to have changes in autonomic nervous function.