Menstrual cycle phase and time of day alter reference signal controlling arm blood flow and sweating.
Menstrual cycle phase and time of day alter reference signal controlling arm blood flow and sweating.
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月经周期阶段和一天中的时间会改变控制手臂血流和出汗的参考信号。
DOI：
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发表时间：
1984
影响因子：
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通讯作者：
Richard R. Gonzalez
中科院分区：
文献类型：
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作者：
L. A. Stephenson;M. A. Kolka;Richard R. Gonzalez
研究了受昼夜节律和月经周期影响的食管温度（Tes）阈值发生的变化，该阈值用于启动热损失反应。四名女性在卵泡期 (F) 和黄体期 (L) 的 35 摄氏度（环境水蒸气压 1.73 kPa）、0400 点和 1600 点以 60% 峰值 Vo2 锻炼 30 分钟。经常测量 Tes、手臂出汗率 (msw) 和前臂血流量 (FBF)。在静止状态下，Tes 在 0400 和 1600 时 L 期间平均比 F 期间高 0.3 摄氏度，并且在这两个阶段，1600 时比 0400 时高约 0.4 摄氏度。在运动瞬态期间，FBF:Tes 和 msw:Tes 关系的斜率在处理之间没有差异。在这两个阶段中，1600 时开始出汗和皮肤血管舒张的阈值均高于 0400 时。 0400 点 F 期间 msw 的阈值平均为 36.44°C，血管舒张的阈值平均为 36.80°C。 1600 L 期间出汗和血管舒张的平均阈值分别为 37.46 和 37.53 摄氏度。我们的数据表明，运动期间的体温调节效应器活动是众多输入的函数，其中之一可能是激素或类激素的作用。在研究女性运动期间的体温调节反应时，控制一天中的时间和月经周期阶段与控制有氧功率、年龄和健康状况同样重要。
The changes occurring in the esophageal temperature (Tes) thresholds for initiation of heat loss responses as affected by the circadian period and menstrual cycle were studied. Four women exercised at 60% peak Vo2 in 35 degrees C (ambient water vapor pressure 1.73 kPa) for 30 min at 0400 and 1600 during the follicular (F) and luteal (L) phase. Tes, arm sweating rate (msw), and forearm blood flow (FBF) were measured frequently. At rest, Tes averaged 0.3 degrees C higher during L than F at both 0400 and 1600 and approximately 0.4 degrees C higher at 1600 than at 0400 during both phases. During exercise transients, the slopes of the FBF:Tes and the msw:Tes relationships were not different among treatments. The thresholds for initiation of sweating and cutaneous vasodilation were higher at 1600 than 0400 during both phases. Thresholds during F at 0400 averaged 36.44 degrees C for msw and 36.80 degrees C for vasodilation. The thresholds during L at 1600 averaged 37.46 and 37.53 degrees C for sweating and vasodilation, respectively. Our data indicate that the thermoregulatory effector activity during exercise is a function of numerous inputs, and one of these may be hormonal or hormonal-like in action. Controlling time of day and menstrual cycle phase are as important as controlling for aerobic power, age, and fitness in studying female thermoregulatory responses during exercise.