Differences in the heat stress associated with white sportswear and being semi-nude in exercising humans under conditions of radiant heat and wind at a WBGT of greater than 28℃
Differences in the heat stress associated with white sportswear and being semi-nude in exercising humans under conditions of radiant heat and wind at a WBGT of greater than 28℃
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WBGT大于28℃的辐射热和风条件下，白色运动服与半裸运动的人体热应激差异
DOI：
10.1007/s00484-013-0722-3
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T
中科院分区：
文献类型：
--
作者：
Tsuji;M;Kume;M;Tuneoka;H;Yoshida;T
本研究探讨了在辐射热和风条件下（如炎热的夏天）进行不同强度的运动时，穿普通白色运动服是否比半裸更能减轻热应激。休息20分钟后，8名男性受试者在保持湿球地球仪温度（WBGT）为28.7 ± 0.1 °C的房间中，使用两盏聚光灯和一台风扇（0.8 m/s气流），以其峰值摄氧量（VO 2峰值）的20%或50%的负荷强度进行三次20分钟的自行车运动。受试者在半裸条件下穿普通白色运动服（WS），包括长袖衬衫（45%棉和55%聚酯）和短裤（100%聚酯），或仅穿游泳裤（SP）。在20%和50%运动条件下，穿SP的受试者平均皮肤温度均高于穿WS的受试者.在50%运动量下，第3次20 min运动结束时，WS组的主观用力感觉（RPE）、热感觉（TS）、食管温度（ΔTes）和心率的增加值均显著高于SP组（P < 0.001-0.05），或有升高趋势（P< 0.07）。WS组的总出汗量（msw，tot）也显著高于SP组（P< 0.05）。然而，在20%的运动期间，运动期间的themsw、tot以及第二和第三次运动结束时的ΔTes、RPE和TS在条件之间没有显著差异。在运动前20分钟的休息期间，根据平均体温的变化（0.9Tes + 0.1）计算的热储存（S）在WS试验中显著低于SP试验。然而，在20%运动期间，两种条件之间的S相似，但在50%运动期间，WS中的S大于SP试验中的S。这些结果表明，在辐射热和高于28 °C的WBGT的风的条件下，穿着普通WS与在轻度运动期间半裸的热应力相似，但在中度运动期间更大，并且在休息期间穿着WS可以减少身体热量的储存。
This study investigated whether wearing common white sportswear can reduce heat stress more than being semi-nude during exercise of different intensities performed under radiant heat and wind conditions, such as a hot summer day. After a 20-min rest period, eight male subjects performed three 20 min sessions of cycling exercise at a load intensity of 20 % or 50 % of their peak oxygen uptake (VO2peak) in a room maintained at a wet bulb globe temperature (WBGT) of 28.7 ± 0.1 °C using two spot lights and a fan (0.8 m/s airflow). Subjects wore common white sportswear (WS) consisting of a long-sleeved shirt (45 % cotton and 55 % polyester) and short pants (100 % polyester), or only swimming pants (SP) under the semi-nude condition. The mean skin temperaturewas greater when subjects wore SP than WS under both the 20 % and 50 % exercise conditions. During the 50 % exercise, the rating of perceived exertion (RPE) and thermal sensation (TS), and the increases in esophageal temperature (ΔTes) and heart rate were significantly higher (P< 0.001–0.05), or tended to be higher (P< 0.07), in the WS than SP trials at the end of the third 20-min exercise session. The total sweat loss (msw,tot) was also significantly higher in the WS than in the SP trials (P< 0.05). However, during the 20 % exercise, themsw,totduring exercise, and the ΔTes, RPE and TS at the end of the second and third sessions of exercise did not differ significant between conditions. The heat storage (S), calculated from the changes in the mean body temperature (0.9Tes + 0.1), was significantly lower in the WS trials than in the SP trials during the 20 min resting period before exercise session. However, S was similar between conditions during the 20 % exercise, but was greater in the WS than in the SP trials during 50 % exercise. These results suggest that, under conditions of radiant heat and wind at a WBGT greater than 28 °C, the heat stress associated with wearing common WS is similar to that of being semi-nude during light exercise, but was greater during moderate exercise, and the storage of body heat can be reduced by wearing WS during rest periods.