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Autonomic responses of women with parental hypertension. Effects of physical activity and fitness.

机译:父母高血压妇女的自主神经反应。体育锻炼和健身的影响。

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We studied the moderating effects of cardiorespiratory fitness and physical activity on heart rate and blood pressure responses to psychophysiological stressors and the carotid-cardiac baroreflex in young normotensive women with a parental history of hypertension (n = 31). Testing occurred during the follicular menstrual phase. Subjects were divided into high versus moderate (46.6 +/- 6.5 versus 35.9 +/- 1.9 mL.kg-1.min-1) VO2peak and high versus moderate (1217.7 +/- 98.4 versus 1015.5 +/- 49.4 J.kg-1.wk-1) physical activity groups. The groups did not differ in heart rate or blood pressure responses to mental arithmetic or the cold-face test. However, the highly fit women had longer maximal R-R intervals compared with the moderately fit women when the carotid-cardiac baroreflex was stimulated by negative pressures applied to the neck during resting conditions (P < .01). The carotid-cardiac baroreflex was attenuated during mental arithmetic compared with rest in both the moderately fit and moderately active women but not in the highly fit and highly active groups. We find no evidence that aerobic fitness reduces sympathetic responses to laboratory stressors in young women with parental hypertension. Our findings are consistent with greater parasympathetic tone during sympathetic challenge for the highly fit and highly active subjects. Clarification of autonomic balance during carotid baroreflex stimulation at rest and during sympathetic challenge after exercise training would provide important information regarding mechanisms that regulate cardiovascular responses to autonomic challenge in women at risk for hypertension.
机译:我们研究了父母血压高的年轻血压正常女性(n = 31)中,心肺健康和体育锻炼对心率和血压对心理生理应激源和颈动脉压力反射的调节作用。测试发生在卵泡期。受试者分为高VO2峰值和中度(46.6 +/- 6.5 vs 35.9 +/- 1.9 mL.kg-1.min-1)VO2peak和高vs中度(1217.7 +/- 98.4对1015.5 +/- 49.4 J.kg- 1.wk-1)体育活动小组。各组对心算或冷脸测试的心率或血压反应无差异。但是,当在静息状态下对颈部施加负压刺激颈-心脏压力反射时,高健康女性的最大R-R间隔要比中健康女性的更长(P <.01)。在中等算术和中等活跃度的女性中,与休息相比,在心算过程中颈动脉的压力反射减弱了,而在高度健身和高度活跃的女性中则没有。我们没有证据表明有氧健身能降低父母高血压的年轻女性对实验室应激源的交感反应。我们的发现与高度适合和高度活跃的受试者在交感神经挑战期间更大的副交感神经一致。在静息的颈动脉压力反射刺激过程中以及运动训练后的交感刺激过程中,自主神经平衡的明确化将提供有关调节有高血压风险的女性对自主神经挑战的心血管反应机制的重要信息。

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