Levy B, Ghaem A, Verpillat J M, Martineaud J P
Pflugers Arch. 1975 Aug 29;359(1-2):137-46. doi: 10.1007/BF00581283.
Measurements were made in man of heart rate (Fc), arterial blood pressure (Pa), cutaneous blood flow (Z) (by plethysmography of the hand) as well as variation sin venous volume (deltaV) in the course of muscular exercise of 70 Watts intensity corresponding from 48% to 60% of the maximal oxygen consumtion of the subjects. These exercises were carried out at ambient temperatures of 22 degrees and 29 degrees C. for 8 min. In every case, an initial lowering of the Q and deltaV followed by a progressive climb was found. The average maximal reduction in output was virtually identical at 22 degrees and 29 degrees C (4.10 +/- 2.05 and 4.00 +/- 2.31 ml/min. 100 cm3). But the average maximal fall in volume turned out to be less at 29 degrees C (0.30 +/- 0.40 ml/100 cm3) than at 22 degrees C (0.60 +/- 0.60 ml/100 cm3). The resistive sector of cutaneous circulation conserves the same vasomotor capacities at the two ambient temperatures studied; the cutaneous capacitive sector shows lower reactivity at the higher ambient temperature. This would suggest that diminished venous return may be partially responsible for poor tolerance to exercise in warm climates.
对人体进行了测量，测量指标包括心率（Fc）、动脉血压（Pa）、皮肤血流量（Z）（通过手部体积描记法测量）以及在强度为70瓦的肌肉运动过程中的静脉容量变化（deltaV），该强度相当于受试者最大耗氧量的48%至60%。这些运动在环境温度为22摄氏度和29摄氏度的条件下进行8分钟。在每种情况下，均发现Q和deltaV最初下降，随后逐渐上升。在22摄氏度和29摄氏度时，输出量的平均最大减少量实际上相同（分别为4.10±2.05和4.00±2.31毫升/分钟·100立方厘米）。但在29摄氏度时，容量的平均最大下降量（0.30±0.40毫升/100立方厘米）比在22摄氏度时（0.60±0.60毫升/100立方厘米）要小。在所研究的两个环境温度下，皮肤循环的阻力部分保持相同的血管运动能力；皮肤容量部分在较高环境温度下显示出较低的反应性。这表明静脉回流减少可能是导致在温暖气候中运动耐受性差的部分原因。
