CUTANEOUS VASCULAR-RESPONSES TO ISOMETRIC HANDGRIP EXERCISE
CUTANEOUS VASCULAR-RESPONSES TO ISOMETRIC HANDGRIP EXERCISE
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DOI：
10.1152/jappl.1989.66.4.1586
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发表时间：
1989-04-01
影响因子：
3.3
通讯作者：
KWAN, CM
中科院分区：
文献类型：
--
作者：
TAYLOR, WF;JOHNSON, JM;KWAN, CM
皮肤血管对动态运动的反应已经得到了很好的表征，但尚不清楚这种反应模式是否适用于等长握力运动。我们研究了五位仰卧位男性对等长握力和动态腿部运动的皮肤血管反应。用激光多普勒测速仪测量皮肤血流，并表示为激光多普勒血流（LDF）。每分钟无创测量一次动脉血压。皮肤血管传导性（CVC）计算为LDF/平均动脉压。LDF和CVC反应在前臂和胸部在两个3分钟的等长握在30%的最大随意收缩期间进行测量，并表示为运动前水平的百分比变化。皮肤为正常温度（32 ℃）。C）第一次握柄，局部加温至39 ℃。C代表第二把手。最后，在局部皮肤温度为39 ℃的动态双腿自行车运动（150-175 W）的5分钟期间观察反应。C.手臂LDF增加24.5。+-。常温等长握力时为18.9%，64.8 ±。39 °等长握法为14.1%。C组（P < 0.05）。臂CVC在32.0 °时没有显著变化。C，但显著增加18.1。39 °等长握杆时为6.5%。C组（P < 0.05）。臂LDF降低12.2 ±。39 °动态运动时为7.9%。C，而臂CVC下降了35.3 . ±-。4.6%（均P < 0.05）。胸部LDF和CVC显示相似的反应。我们的结论是，皮肤血流量增加，在等长握相反，皮肤血管收缩与动态运动的开始。在39度。C，皮肤血流量的增加部分是由于CVC增加。
Cutaneous vascular responses to dynamic exercise have been well characterized, but it is not known whether that response pattern applies to isometric handgrip exercise. We examined cutaneous vascualr responses to isometric handgrip and dynamic leg exercise in five supine men. Skin blood flow was measured by laser-Doppler velocimetry and expressed as laser-Doppler flow (LDF). Arterial blood pressure was measured noninvasively once each minute. Cutaneous vascular conductance (CVC) was calculated as LDF/mean arterial pressure. LDF and CVC responses were measured at the forearm and chest during two 3-min periods of isometric handgrip at 30% of maximum voluntary contraction and expressed as percent changes from the preexercise levels. The skin was normothermic (32.degree. C) for the first period of handgrip and was locally warmed to 39.degree. C for the second handgrip. Finally, responses were observed during 5 min of dynamic two-leg bicycle exercise (150-175 W) at a local skin temperature of 39.degree. C. Arm LDF increased 24.5 .+-. 18.9% during isometric handgrip in normothermia and 64.8 .+-. 14.1% during isometric handgrip at 39.degree. C (P < 0.05). Arm CVC did not significantly change at 32.degree. C but significantly increased 18.1 .+-. 6.5% during isometric handgrip at 39.degree. C (P < 0.05). Arm LDF decreased 12.2 .+-. 7.9% during dynamic exercise at 39.degree. C, whereas arm CVC fell by 35.3 .+-. 4.6% (in each case P < 0.05). Chest LDF and CVC showed similar responses. We conclude that skin blood-flow increases during isometric handgrip in contrast to the cutaneous vasoconstriction seen with the onset of dynamic exercise. At 39.degree. C, the increase in skin blood flow is in part due to increased CVC.