Effects of cooling or warming of the distal upper limb on skin vascular conductance and brachial artery shear profiles during cycling exercise
Effects of cooling or warming of the distal upper limb on skin vascular conductance and brachial artery shear profiles during cycling exercise
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DOI：
10.1080/15438627.2021.1872573
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发表时间：
2021-01-22
影响因子：
2.4
通讯作者：
Fukuba，Yoshiyuki
中科院分区：
文献类型：
--
作者：
Miura，Kohei;Kashima，Hideaki;Fukuba，Yoshiyuki
无毛（G;手掌）和非无毛（NG;背侧和前臂）区域的皮肤血管传导性对上游肱动脉切应力（BA-SS）曲线的相对影响尚不清楚。本研究的目的是阐明G和/或NG皮肤血管传导性（VC），这是调制的温暖或冷却的手法，对BA剪切率（SR，SS的估计）在骑自行车运动。7名健康受试者进行了60分钟的运动。在运动的20至50分钟之间，使用水浴将NG+G或G皮肤区域加温至42°C或冷却至15°C。在整个方案中，测量前臂和手掌的BA和皮肤VC的直径和血流速度。所有测量结果表明，运动20分钟后达到稳态反应。随后，在冷却手法期间，前臂VC显著降低，并且在NG+G中显示伴随的BA-SR曲线（主要特征为顺行SR降低和逆行SR增加）。在单独的G中没有观察到这种变化。在温手法过程中，前臂VC和BA-SR平均值仅在NG+G组显著增加。总之，NG皮肤的血管反应可能在自行车运动期间BA-SS分布的调制中起着重要作用。
The relative influence of skin vascular conductance in glabrous (G; palm) and non-glabrous (NG; dorsal and forearm) regions to upstream brachial artery-shear stress (BA-SS) profile are unknown. This study aimed to elucidate the effects of G and/or NG skin vascular conductance (VC), which were modulated by warming or cooling manipulation, on BA-shear rate (SR, an estimate of SS) during cycling exercise. Seven healthy subjects performed 60-min exercise. Between 20 and 50 min of the exercise, the NG+G or G skin region were warmed to 42°C or cooled to 15°C using a water bath. Throughout the protocol, diameter and blood velocity in BA and skin VCs in forearm and palm were measured. All measurements showed that a steady-state response was reached after 20 min of exercise. Subsequently, during cooling manipulation, forearm VC was significantly decreased, and the concomitant BA-SR profile was revealed (primarily characterized by decreased antegrade SR and increased retrograde SR) in the NG+G. Such changes were not observed in G alone. During warming manipulation, forearm VC and mean BA-SR significantly increased only in the NG+G. In conclusion, vascular response in NG skin possibly plays a major role in the modulation of BA-SS profile during cycling exercise.