Combined effects of solar radiation and airflow on endurance exercise capacity in the heat
Combined effects of solar radiation and airflow on endurance exercise capacity in the heat
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DOI：
10.1016/j.physbeh.2020.113264
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发表时间：
2021-02-01
影响因子：
2.9
通讯作者：
Maughan, Ronald J.
中科院分区：
文献类型：
--
作者：
Otani, Hidenori;Kaya, Mitsuharu;Maughan, Ronald J.
这项研究调查了不同水平的太阳辐射和气流对运动热应激期间耐力运动能力和体温调节反应的综合影响。 10 只雄性在环境室（30 摄氏度，50% 相对湿度）中以 70% 峰值摄氧量进行循环，直至精疲力竭。测试了四种太阳辐射和气流组合（800 W.m(-2) 和 10 km.h(-1) [高-低]、800 W.m(-2) 和 25 km.h -1 [高-高]、0 W.m(-2) 和 10 km.h(-1) [无-低]、0 W.m(-2) 和 25 km.h(-1) [无高]）。参与者通过安装在天花板上的太阳模拟器（金属卤化物灯）暴露在太阳辐射下，并通过两个工业风扇承受逆风。 High-Low（平均值 + SD；35 +/- 7 分钟）中的疲劳时间比其他试验更短（p < 0.05），High-High（43 +/- 6 分钟）和 No-Low（46 +/- 9 分钟）比 No-High（61 +/- 9 分钟）更短。总（干+蒸发）热交换存在交互作用，高-低和高-高的交互作用小于无低和无高的交互作用，无低的交互作用小于无高的交互作用（均 p < 0.001）。在高（高-低和高-高）太阳辐射试验中，核心温度、心率和热感觉高于无（无低和无高）太阳辐射试验，在较低（高-低和无低）气流试验中，高于较高（高-高和无高）气流试验（p < 0.05）。在高太阳辐射试验中，平均皮肤温度和感知用力等级高于无太阳辐射试验（p < 0.05）。这项研究表明，在运动热应激期间，与高太阳辐射和较高气流相结合以及无太阳辐射和较低/较高气流相结合相比，高太阳辐射和较低气流相结合会对体温调节和感知应变以及耐力运动能力产生负面影响。
This study investigated the combined effects of different levels of solar radiation and airflow on endurance exercise capacity and thermoregulatory responses during exercise-heat stress. Ten males cycled at 70% peak oxygen uptake until exhaustion in an environmental chamber (30 degrees C, 50% relative humidity). Four combinations of solar radiation and airflow were tested (800 W.m(-2) and 10 km.h(-1) [High-Low], 800 W.m(-2) and 25 km.h -1 [High-High], 0 W.m(-2) and 10 km.h(-1) [No-Low], and 0 W.m(-2) and 25 km.h(-1) [No-High]). Participants were exposed to solar radiation by a ceiling-mounted solar simulator (Metal halide lamps) and the headwind by two industrial fans. Time to exhaustion was shorter (p < 0.05) in High-Low (mean + SD; 35 +/- 7 min) than the other trials and in High-High (43 +/- 6 min) and No-Low (46 +/- 9 min) than No-High (61 +/- 9 min). There was an interaction effect in total (dry + evaporative) heat exchange which was less in High-Low and High-High than No-Low and No-High, and in No-Low than No-High (all p < 0.001). Core temperature, heart rate and thermal sensation were higher in high (High-Low and High-High) than no (No-Low and No-High) solar radiation trials and in lower (High-Low and No-Low) than higher (High-High and No-High) airflow trials (p < 0.05). Mean skin temperature and rating of perceived exertion were higher in high than no solar radiation trials (p < 0.05). This study indicates that combining high solar radiation and lower airflow have negative effects on thermoregulatory and perceptual strain and endurance exercise capacity than when combining high solar radiation and higher airflow and combining no solar radiation and lower/higher airflow during exercise-heat stress.