Department of Kinesiology, University of Georgia, Athens, Georgia 30602-6554, USA.
Psychophysiology. 2013 Sep;50(9):831-40. doi: 10.1111/psyp.12074. Epub 2013 Jun 27.
The study examined whether cardiorespiratory fitness modifies cardiovascular responses by normotensive men and women during the Stroop color-word interference test. Independent of age and an estimate of body fatness, fitness level was positively related (R² = .39 and .51) to increases in limb blood flow and vascular conductance, coherent with cardiac-vagal withdrawal and a decrease in heart period, among women but not men. Fitness was unrelated to changes in systolic and diastolic blood pressures and muscle sympathetic nerve activity. The augmented hemodynamic responses among fitter women were not consistent with passive vasodilation via withdrawal of sympathetic neural tone. The results encourage further gender comparisons testing whether fitness augments limb blood flow during mental stress by neurohumoral and flow-mediated vasodilatory mechanisms or by increased cardiac output.
本研究旨在探讨心肺适能是否能改变血压正常的男性和女性在 Stroop 色词干扰测验中的心血管反应。独立于年龄和体脂估计，女性的体能水平与肢体血流量和血管传导性的增加呈正相关（R²=0.39 和 0.51），与心脏迷走神经的撤出和心动周期的减少一致，但与男性无关。体能与收缩压和舒张压以及肌肉交感神经活动的变化无关。在体能更好的女性中，血液动力学反应增强与通过交感神经张力撤出引起的被动血管扩张不一致。这些结果鼓励进一步进行性别比较，以测试在精神压力下，通过神经激素和血流介导的血管扩张机制或通过增加心输出量，体能是否能增强肢体血流量。
