与男性相比,年轻女性在运动前的倒计时时进行了缓和的巴罗反射介导的交感抑制和血管扩张
Kazumasa Manabe1,2, Andrew W D'Souza1,2,3, Ryosuke Takeda1,2
1Women's Heart Health Laboratory, Institute for Exercise and Environmental Medicine at Texas Health Presbyterian Hospital Dallas, 7232 Greenville Avenue, Dallas, TX, 75231, USA.
与男性相比,年轻女性对运动预期的神经血管反应减少,同情性戒断和血管扩张较少. 这可能会影响运动开始时的氧气供应.
科学领域:
- 运动生理学 运动生理学
- 神经心血管科学 神经心血管科学
- 在生理学的性别差异.
背景情况:
- 运动前的预期可以触发神经心血管反应,包括通过巴罗反射介导的同情性戒断的外周血管扩张.
- 这种反应有利于在男性开始运动时向肌肉输送氧气.
- 目前尚不清楚年轻女性是否会表现出类似的反应,因为神经心血管应激反应通常不同.
研究的目的:
- 为了调查生物性是否影响运动前预期期间的神经心血管反应.
- 为了比较运动前倒计时对年轻男性和女性大脑和心血管反应的影响.
主要方法:
- 健康的年轻女性 (n=11) 和男性 (n=10) 进行了静态手握运动,并没有30秒倒计时.
- 测量包括中脑动脉血速 (VMCA),心率 (HR),心脏指数 (CI),平均动脉压 (MAP),肌肉交感神经活动 (MSNA) 和腿血管导电 (LVC).
主要成果:
- 与男性相比,女性在倒计时期间CI,MAP和LVC的增加较小,MSNA的减少较小 (p<0.05).
- VMCA和HR的增加,以及同情性巴罗反射灵敏度在两性之间没有差异 (p>0.05).
结论:
- 与年轻男性相比,年轻女性在应对运动预期时表现出减少的巴罗反射介导的同情性撤回和外周血管扩张.
- 这些基于性别的神经血管反应差异可能会影响女性运动开始时肌肉的氧气供应.
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