Effects of two cooling strategies on thermoregulatory responses of tetraplegic athletes during repeated intermittent exercise in the heat.
Effects of two cooling strategies on thermoregulatory responses of tetraplegic athletes during repeated intermittent exercise in the heat.
复制标题
两种降温策略对四肢瘫痪运动员在高温下重复间歇运动期间体温调节反应的影响。
DOI：
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发表时间：
2005
影响因子：
3.3
通讯作者：
Victoria L Goosey
中科院分区：
文献类型：
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作者：
Nick Webborn;Michael J. Price;Paul C. Castle;Victoria L Goosey
与身体健全的人相比，患有脊髓损伤（SCI）的运动员，尤其是四肢瘫痪的运动员，发生热应变并因此患上热病的风险更高。在炎热环境中运动时减少热应变的策略可能会降低中暑的风险。为了测试在炎热环境中间歇性冲刺运动期间预冷或冷却会减弱四肢瘫痪运动员核心温度升高的假设，8 名患有 SCI 的男性受试者（病变 C(5)-C(7)；2 个不完全病变）进行了四次热应激试验（32.0 +/- 0.1 摄氏度，50 +/- 0.1% 相对湿度）。在评估休息 80 分钟的基线体温调节反应后，受试者执行 3 个间歇冲刺方案，持续 28 分钟。所有试验均在手臂曲柄测力计上进行，并涉及无冷却控制 (Con)、20 分钟预冷却 (Pre) 或运动期间冷却 (Dur)。试验以随机顺序进行。间歇性冲刺方案后，Con 期间的平均核心温度（37.3 +/- 0.3 摄氏度）高于 Pre 和 Dur（分别为 36.5 +/- 0.6 摄氏度和 37.0 +/- 0.5 摄氏度；P < 0.01）。此外，与 Con (14 +/- 2) 相比，Pre (13 +/- 2；P < 0.01) 和 Dur (12 +/- 1；P < 0.01) 期间感知的用力较低。这些结果表明，在高温下间歇性冲刺运动期间的预冷和冷却都可以减少四肢瘫痪运动员的热应变。冷却策略似乎还显示出在相同时间点的感知消耗减少，这可能转化为功能能力的提高。
Athletes with spinal cord injury (SCI), and in particular tetraplegia, have an increased risk of heat strain and consequently heat illness relative to able-bodied individuals. Strategies that reduce the heat strain during exercise in a hot environment may reduce the risk of heat illness. To test the hypotheses that precooling or cooling during intermittent sprint exercise in a heated environment would attenuate the rise in core temperature in tetraplegic athletes, eight male subjects with SCI (lesions C(5)-C(7); 2 incomplete lesions) undertook four heat stress trials (32.0 +/- 0.1 degrees C, 50 +/- 0.1% relative humidity). After assessment of baseline thermoregulatory responses at rest for 80 min, subjects performed three intermittent sprint protocols for 28 min. All trials were undertaken on an arm crank ergometer and involved a no-cooling control (Con), 20 min of precooling (Pre), or cooling during exercise (Dur). Trials were administered in a randomized order. After the intermittent sprint protocols, mean core temperature was higher during Con (37.3 +/- 0.3 degrees C) compared with Pre and Dur (36.5 +/- 0.6 degrees C and 37.0 +/- 0.5 degrees C, respectively; P < 0.01). Moreover, perceived exertion was lower during Pre (13 +/- 2; P < 0.01) and Dur (12 +/- 1; P < 0.01) compared with Con (14 +/- 2). These results suggest that both precooling and cooling during intermittent sprint exercise in the heat reduces thermal strain in tetraplegic athletes. The cooling strategies also appear to show reduced perceived exertion at equivalent time points, which may translate into improved functional capacity.