Interaction of local and reflex thermal effects in control of forearm blood flow.
Interaction of local and reflex thermal effects in control of forearm blood flow.
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局部热效应和反射热效应在控制前臂血流中的相互作用。
DOI：
10.1152/jappl.1985.58.1.251
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
Nadel,ER
中科院分区：
文献类型：
--
作者：
Wenger,CB;Bailey,RB;Roberts,MF;Nadel,ER
我们测量了 6 名受试者在 15 分钟腿部运动期间和恢复后的前 10 分钟期间的双侧前臂血流量 (ABF)。在所有实验中，一只前臂（对照）的皮肤温度均保持在约 33 摄氏度。在环境温度 (Ta) 为 15 摄氏度的实验中，另一只手臂（实验）在三个连续的运动和恢复周期中分别保持在约 26、33 和 40 摄氏度。 26°C 前臂的 ABF 与对照呈线性相关，平均为对照的 42%。 40°C 前臂中的 ABF 与对照 ABF 的关系显示，对照 ABF 弯曲为 4-5 ml X 100 ml-1 X min-1。在弯曲以下，实验 ABF 平均为对照的 213%。在弯曲上方，实验 ABF 平均为 5.09 ml X 100 ml-1 X min-1，高于对照。在四名受试者中，将实验前臂加热至 40°C 后，我们在 15°C 和 25°C 的 Ta 中测量静息 25-30 分钟的 ABF。在 25°C Ta 时，加热前臂的 ABF 逐渐上升，但对照 ABF 几乎没有变化。在 15°C Ta 时，局部加热至 40°C 对 ABF 的影响大大降低，这显然是由于反射性血管收缩信号所致。
We measured forearm blood flow (ABF) bilaterally on six subjects during 15-min periods of leg exercise and the first 10 min of recovery. One forearm (control) was kept at about 33 degrees C skin temperature in all experiments. In experiments at ambient temperature (Ta) of 15 degrees C, the other arm (experimental) was kept at about 26, 33, and 40 degrees C, respectively, during three successive cycles of exercise and recovery. ABF in the 26 degrees C forearm was linearly related to and averaged 42% of control. The relation of ABF in the 40 degrees C forearm to control ABF showed a bend at control ABF of 4–5 ml X 100 ml-1 X min-1. Below the bend, experimental ABF average 213% of control. Above the bend, experimental ABF averaged 5.09 ml X 100 ml-1 X min-1 above control. In four subjects, after heating the experimental forearm to 40 degrees C, we measured ABF for 25–30 min at rest in Ta of both 15 and 25 degrees C. At 25 degrees C Ta, ABF in the heated forearms rose gradually, but control ABF showed little change. At 15 degrees C Ta, the effect on ABF of local heating to 40 degrees C was much reduced, apparently due to reflex vasoconstrictor signals.