Effects of menstrual cycle and physical training on heat loss responses during dynamic exercise at moderate intensity in a temperate environment
Effects of menstrual cycle and physical training on heat loss responses during dynamic exercise at moderate intensity in a temperate environment
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DOI：
10.1152/ajpregu.00547.2004
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发表时间：
2005-05-01
影响因子：
2.8
通讯作者：
Kondo, N
中科院分区：
文献类型：
--
作者：
Kuwahara, T;Inoue, Y;Kondo, N
我们评估了在温和环境中进行适度运动时，月经周期和体育锻炼对热量流失(出汗和皮肤血管扩张)反应的影响。10名未训练妇女(U组)和7名耐力训练妇女(T组)(最大摄氧量分别为36.7+/-1.1和49.4+/-1.7ml.kg(-1).min(-1)；P<；0.05)在温和的环境(环境温度25℃，相对湿度45%)中，在卵泡中期和黄体中期以50%的最大摄氧量进行30min的自行车运动。U组静息雌酮、雌二醇、孕酮水平及运动时食道温度(T-ES)均显著高于卵泡中期(P<；0.05)。在运动中，黄体中期的出汗率和胸部、背部、前臂和大腿的皮肤血流量(通过激光多普勒血流仪测量)低于卵泡中期。与卵泡中期相比，黄体中期的TES热损失反应阈值显著较高，而热损失反应的敏感度显著降低，与身体部位无关。T组的出汗率和皮肤血流量均显著高于U组，无论月经时相或体位。在黄体中期，T组的TES反应阈值明显低于U组，热损失反应的敏感性显著高于U组；而在卵泡中期，T组的出汗反应敏感性显著高于U组。这些结果表明，与卵泡中期相比，U组黄体中期的热损失反应受到抑制。T组月经周期无明显影响，运动训练可改善热丢失反应，黄体中期较卵泡中期更为明显。
We evaluated the effects of the menstrual cycle and physical training on heat loss (sweating and cutaneous vasodilation) responses during moderate exercise in a temperate environment. Ten untrained (group U) and seven endurance-trained (group T) women (maximal O-2 uptake of 36.7 +/- 1.1 vs. 49.4 +/- 1.7 ml.kg(-1).min(-1), respectively; P < 0.05) performed a cycling exercise at 50% maximal O-2 uptake for 30 min during both the midfollicular and midluteal menstrual phase in a temperate environment (ambient temperature of 25 degrees C, relative humidity of 45%). In group U, plasma levels of estrone, estradiol, and progesterone at rest and esophageal temperature (T-es) during exercise were significantly higher during the midluteal than during the midfollicular phase (P < 0.05). Sweating rate and cutaneous blood flow (measured via laser-Doppler flowmetry) on the chest, back, forearm, and thigh were lower during the midluteal than during the midfollicular phase during exercise. Tes threshold for heat loss responses was significantly higher and sensitivity of the heat loss responses was significantly lower in the midluteal than in the midfollicular phase, regardless of body site. These effects of the menstrual cycle in group U were not observed in group T. The sweating rate and cutaneous blood flow were significantly higher in group T than in group U, regardless of menstrual phase or body site. Tes threshold for heat loss responses was significantly lower and sensitivity of heat loss responses was significantly greater in group T than in group U in the midluteal phase; however, sensitivity of the sweating response was significantly greater in the midfollicular phase. These results suggest that heat loss responses in group U were inhibited in the midluteal phase compared with in the midfollicular phase. Menstrual cycle had no remarkable effects in group T. Physical training improved heat loss responses, which was more marked in the midluteal than in the midfollicular phase.