SEASONAL-VARIATION IN SWEATING RESPONSES OF OLDER AND YOUNGER MEN
SEASONAL-VARIATION IN SWEATING RESPONSES OF OLDER AND YOUNGER MEN
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DOI：
10.1007/bf00601802
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发表时间：
1995-01-01
期刊：
影响因子：
--
通讯作者：
ARAKI, T
中科院分区：
文献类型：
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作者：
INOUE, Y;NAKAO, M;ARAKI, T
8名老年人（60-65岁）和6名年轻人（20-25岁）在夏季，秋季，冬季和春季暴露于标准热应激60分钟。测试包括将小腿和脚放在42摄氏度的水浴中，同时坐在恒定的环境条件下（30摄氏度和45%的相对湿度）。老年组直肠温度（Δ T-re）的升高在秋季、冬季和春季显著大于夏季（P < 0.05），而青年组仅在冬季显著大于夏季（P < 0.05）。老年组的Δ T-re在各季节均高于对照组，但仅在秋季和春季有显著性差异（P < 0.01）。在热试验期间，各组的代谢产热（M）和平均皮肤温度（$/bar T-sk）没有显著的季节性差异，尽管老年组的M和（$/bar T-sk）在所有季节都较低（P < 0.01）。老年组总出汗率（m（sw））除以Δ T-re（总m（sw）/Δ T-re）从夏季到冬季呈下降趋势（P < 0.02），冬季与春季无差异;而青年组总m（sw）/Δ T-re从秋季到冬季呈下降趋势，春季呈上升趋势（P < 0.03）。背部和大腿局部出汗率除以Δ T-re（背部m（sw）/Δ T-re和大腿m（sw）/Δ T-re）的值的变化与各组的总m（sw）/Δ T-re的变化相似，但年轻组的背部m（sw）/Δ T-re从冬季到春季没有增加。夏季、秋季和春季老年组总m（sw）/Δ T-re、背部m（sw）/Δ T-re和大腿m（sw）/Δ T-re显著低于对照组（P < 0.05）。老年组的季节性变化幅度明显较小（P < 0.001）。结果表明，与年轻男性相比，老年男性的出汗功能的增强发生在夏季后，其减少发生在冬季前，尽管季节变化范围较小，老年男性有一定的能力，以维持T-re时，在所有季节的热应激的挑战。
Eight older (60-65 years) and six younger (20-25 years) men were exposed to a standard heat stress for 60 min in summer, autumn, winter, and spring. The test consisted of placing the lower legs and feet in a 42 degrees C water bath while sitting in constant environmental conditions (30 degrees C and 45% relative humidity). The increase of rectal temperature (Delta T-re) was significantly greater (P < 0.05) in autumn, winter, and spring than in summer for the older group, but significantly greater only in winter than in summer for the younger group (P < 0.05). The Delta T-re was greater for the older group in all seasons, but of significance only in autumn and spring (P < 0.01). There were no significant season-related differences for metabolic heat production (M) and mean skin temperature (($) over bar T-sk) during the heat test in the respective groups, although the M and ($) over bar T-sk were lower for the older group in all seasons (P < 0.01). In the older group total body sweating rate (m(sw)) divided by Delta T-re (total m(sw) /Delta T-re) decreased from summer to winter (P < 0.02) and did not differ between winter and spring, whereas total m(sw)/Delta T-re in the younger group increased in spring after decreasing from autumn to winter (P < 0.03). The variations of the value, local sweating rate on the back and thigh divided by Delta T-re (back m(sw)/Delta T-re and thigh m(sw)/Delta T-re), were similar to those of the total m(sw)/Delta T-re in each group, except for back m(sw)/Delta T-re in the younger group, which did not increase from winter to spring. The total m(sw)/Delta T-re,back m(sw)/Delta T-re and thigh m(sw)/Delta T-re were significantly less for the older group in summer, autumn and spring (P < 0.05). The range of seasonal variations was significantly less for the older group (P < 0.001). The results indicated that, compared with younger men in older men, the enhancement of sweating function toward summer occurred later and its reduction toward winter occurred earlier despite a smaller range of seasonal variation and that older men had a somewhat lesser capability to maintain T-re when challenged by heat stress in all seasons.