Drinkwater B L, Bedi J F, Loucks A B, Roche S, Horvath S M
J Appl Physiol Respir Environ Exerc Physiol. 1982 Sep;53(3):671-6. doi: 10.1152/jappl.1982.53.3.671.
Ten postmenopausal and ten younger women rested for 2 h in a 40 degrees C, 22.2-Torr vapor pressure environment. Sweating response was monitored by resistance hygrometry for onset, a platform balance for whole-body sweat rate, and five individual capsules for regional sweat rate. Other variables measured included forearm blood flow, heart rate (HR), mean skin (Tsk) and rectal (Tre) temperatures, sweat electrolytes (Na+ and K+), oxygen uptake, and plasma volume changes. Preliminary tests included maximal aerobic power (VO2max) and percent body fat. Heat stress did not elicit any significant differences in sweating response between age groups. Indices of heat strain, Tre and HR, were also similar for both groups. The only significant difference between younger and older women was a higher Na+ concentration in the forearm sweat of postmenopausal women. No thermoregulatory responses were related to age, but both sweat rate (r = 0.48) and peak Tsk (r = -0.43) were related to VO2max. For healthy, active, older women aging did not diminish the functional capacity of the sweating mechanism to cope with heat stress while resting in this specific thermal environment.
十名绝经后女性和十名年轻女性在40摄氏度、22.2托蒸气压环境中休息2小时。通过电阻湿度测定法监测出汗反应的起始时间，用平台秤测量全身出汗率，用五个单独的胶囊测量局部出汗率。测量的其他变量包括前臂血流量、心率（HR）、平均皮肤温度（Tsk）和直肠温度（Tre）、汗液电解质（Na+和K+）、摄氧量和血浆容量变化。初步测试包括最大有氧功率（VO2max）和体脂百分比。热应激在不同年龄组的出汗反应上未引起任何显著差异。两组的热应激指标Tre和HR也相似。年轻女性和老年女性之间唯一的显著差异是绝经后女性前臂汗液中的Na+浓度较高。没有任何体温调节反应与年龄相关，但出汗率（r = 0.48）和最高Tsk（r = -0.43）均与VO2max相关。对于健康、活跃的老年女性来说，在这种特定热环境中休息时，衰老并未削弱出汗机制应对热应激的功能能力。
