Muscle blood flow is not reduced in humans during moderate exercise and heat stress.
Muscle blood flow is not reduced in humans during moderate exercise and heat stress.
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在适度运动和热应激期间，人类的肌肉血流量不会减少。
DOI：
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发表时间：
1988
影响因子：
3.3
通讯作者：
B. Saltin
中科院分区：
文献类型：
--
作者：
G. Savard;B. Nielsen;J. Laszczynska;B. Larsen;B. Saltin
热应激对运动腿循环的影响是通过单腿膝关节伸展和双腿自行车运动来确定的，包括坐着和直立。受试者穿着水灌注服连续锻炼三次，每次25分钟：对照组[CT，平均皮肤温度（Tsk）= 35 ℃]，热组（H，Tsk = 38 ℃）和冷组（C，Tsk = 31 ℃）。在加热期间，食管温度在三种运动中分别增加到最大值37.91、39.35和39.05 ℃。在整个运动过程中，单腿或双腿的肺氧摄取量（VO2）没有显著变化。通过热稀释法在一条腿的股静脉中测量的腿部血流量（LBF）在CT、H和C期间保持不变。静脉血浆乳酸浓度随着时间的推移逐渐下降，并没有增加乳酸释放的趋势在加热期间被发现。同样，股动静脉氧差和腿部VO2保持不变之间的三个运动周期。虽然心输出量（乙炔再呼吸）在H期间没有显着增加，有一种趋势，增加1和2升/分钟，在一条腿和两条腿的运动，分别，这可以解释在加热过程中的皮肤总血流量增加的一部分（衡量前臂血流量的变化）。因为在这些实验中，LBF在运动和热应激期间没有减少，皮肤血流量的额外增加必须通过血液从血管床而不是活动骨骼肌重新分布来满足。
The effect of heat stress on circulation in an exercising leg was determined using one-legged knee extension and two-legged bicycle exercise, both seated and upright. Subjects exercised for three successive 25-min periods wearing a water-perfused suit: control [CT, mean skin temperature (Tsk) = 35 degrees C], hot (H, Tsk = 38 degrees C), and cold (C, Tsk = 31 degrees C). During the heating period, esophageal temperature increased to a maximum of 37.91, 39.35, and 39.05 degrees C in the three types of exercise, respectively. There were no significant changes in pulmonary O2 uptake (VO2) throughout the entire exercise period with either one or two legs. Leg blood flow (LBF), measured in the femoral vein of one leg by thermodilution, remained unchanged between CT, H, and C periods. Venous plasma lactate concentration gradually declined over time, and no trend for an increased lactate release during the heating period was found. Similarly, femoral arteriovenous O2 difference and leg VO2 remained unchanged between the three exercise periods. Although cardiac output (acetylene rebreathing) was not significantly higher during H, there was a tendency for an increase of 1 and 2 l/min in one- and two-legged exercise, respectively, which could account for part of the increase in total skin blood flow during heating (gauged by changes in forearm blood flow). Because LBF was not reduced during exercise and heat stress in these experiments, the additional increase in skin blood flow must have been met by redistribution of blood away from vascular beds other than active skeletal muscle.
影响因子：
3.3
作者：
LEWIS, SF;TAYLOR, WF;BLOMQVIST, CG
通讯作者：
BLOMQVIST, CG