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前臂升高会损害局部静态手握的耐力,可能是由于血管导电率和 perfusion 压力下降:重新审视 Rohmert 曲线
L Heinzl1, S Risse1, H Schwarzbach1
1Institute for Anatomy und Cell Biology, Department of Medical Cell Biology, Philipps-Universität Marburg, Robert-Koch-Str. 8, 35032, Marburg, Germany.
Scientific reports
|January 8, 2025
概括
肢体位置会影响低强度的最大同位数收缩时间 (MICT). 在心脏水平以上的工作通过降低前臂血流来降低MICT,这表明对局部耐力有液态效应.
科学领域:
- 运动生理学 运动生理学
- 人体生理学 人体生理学
- 生物力学 生物力学
背景情况:
- 最大同度收缩时间 (MICT) 对于运动任务至关重要,并受到骨肌肉血流的影响,特别是在最大自愿力量 (MVC) 的较低百分比时.
- 肢体工作位置的影响,可以改变 perfusion 压力和血管压缩,在MICT仍然在很大程度上未经调查.
研究的目的:
- 调查前臂相对于心脏水平的位置如何影响最大同位数收缩时间 (MICT) 在最大自愿力量 (MVC) 的各种强度下.
- 为了检查前臂血流 (FBF),血管阻力和不同四肢位置下的MICT之间的关系.
主要方法:
- 14名健康的年轻男子在15%,20%,30%,40%,70%的MVC中进行了双边握手MICT.
- 前臂位置被设置为0.0,+27.5厘米和-27.5厘米相对于心脏水平.
- 使用静脉封闭囊造影法测量了前臂血流 (FBF) 和手臂血压.
主要成果:
- 当前臂在心脏水平上方27.5厘米处时,MICT在15%的MVC显着较短 (66.3-86.2秒),而心脏水平在心脏水平上方或以下.
- 在15%的MVC,峰值FBF较低,血管阻力更高,前臂高于心脏水平.
- 在20-70%的MVC中,MICT不受前臂位置的影响.
结论:
- 在心脏水平以上的前臂上工作可以在低收缩强度 (15% MVC) 上限制MICT.
- 这种限制似乎是由前臂血液流量减少和血管阻力增加,可能是由于水静压和引力效应造成的.
- 这些发现表明,在评估局部同位素耐力时,应考虑水静电和血液动力学因素.
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