Effects of physical training on heat loss responses of young women to passive heating in relation to menstrual cycle
Effects of physical training on heat loss responses of young women to passive heating in relation to menstrual cycle
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DOI：
10.1007/s00421-005-1329-0
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发表时间：
2005-07-01
影响因子：
3
通讯作者：
Kondo, N
中科院分区：
文献类型：
--
作者：
Kuwahara, T;Inoue, Y;Kondo, N
为了研究体能训练对处于卵泡期和黄体期的年轻女性皮肤血管扩张和出汗反应的影响，11名体能训练组（T组）和13名未训练组（U组）的女性在月经周期的卵泡中期和黄体中期被动地将小腿浸泡在42摄氏度的热水中加热60分钟（环境温度为30摄氏度和45% RH）。从卵泡中期到黄体中期，T组和U组雌性激素均显著升高，但T组升高程度明显较低。在两个月经期，T组的皮肤血管舒张和出汗反应的平均体温阈值(（T)大于(b)）明显低于U组，在黄体中期两组之间的差异最大。排汗频率（F-sw）与(T)除以横线(b)之间的关系斜率，以及局部出汗率与Fsw之间的关系斜率在T组中显著更大，尽管皮肤血流量与(T)除以横线(b)之间的关系斜率在各组之间没有差异，无论身体部位或月经期如何。这些结果表明，有规律的体育活动可以增强年轻女性的出汗和皮肤血管舒张。出汗的增强是由中枢和外周机制引起的，皮肤血管舒张的增强可能是由中枢机制引起的。通过中枢机制增强热损失反应在黄体中期比在卵泡中期更大，因为T组在黄体中期女性生殖激素水平的升高相对较低。
To examine the effects of physical training on cutaneous vasodilation and sweating responses of young women in the follicular and luteal phase, 11 physically trained (T group) and 13 untrained (U group) women were passively heated by lower-leg immersion into hot water of 42 degrees C (ambient temperature of 30 degrees C and 45% RH) for 60 min in their mid-follicular and mid-luteal phases of the menstrual cycle. Female hormones increased significantly from the mid-follicular to the mid-luteal phase in T and U groups, but the degree of increase was significantly lower in T group. Mean body temperature ((T) over bar (b)) thresholds for cutaneous vasodilation and sweating responses were significantly lower in T group than in U group, in both the menstrual phases, and the differences between the groups were greatest during the mid-luteal phase. The slope of the relationship between frequency of sweat expulsion (F-sw) and (T) over bar (b), and between local sweating rate and Fsw was significantly greater in T group, although the slope of the relationship between cutaneous blood flow and (T) over bar (b) did not differ between the groups, regardless of body site or menstrual phase. These results suggest that regular physical activity enhanced sweating and cutaneous vasodilation in young women. The enhancement of sweating was due to both central and peripheral mechanisms, and the enhancement of cutaneous vasodilation was possibly due to a central mechanism. Enhancement of heat loss responses via central mechanisms was greater during the mid-luteal phase than in the mid-follicular phase because the elevation of female reproductive hormone levels during the mid- luteal phase was relatively low in T group.