Heat acclimation improves exercise performance
Heat acclimation improves exercise performance
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DOI：
10.1152/japplphysiol.00495.2010
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发表时间：
2010-10-01
影响因子：
3.3
通讯作者：
Minson, Christopher T.
中科院分区：
文献类型：
--
作者：
Lorenzo, Santiago;Halliwill, John R.;Minson, Christopher T.
本研究探讨了热习服对提高冷热环境下运动能力的影响。在10天的热适应（类似于40摄氏度下50%（V）超过dotO（2max））程序之前和之后，12名受过训练的自行车运动员在冷[13摄氏度，30%相对湿度（RH）]和热（38摄氏度，30%RH）环境中进行最大有氧功率（（V）超过dotO（2max））（，）计时性能和乳酸阈值测试。在dot0（2max）和乳酸盐阈值测试中的热和冷条件（V）之前，分别用温水（41 ℃）或热中性水（34 ℃）浸泡以诱导高热（0.8 - 1.0 ℃）或维持正常体温。8名匹配的对照受试者在相同的环境中完成了相同的运动测试，在凉爽（13摄氏度）的环境中进行了10天的相同运动。在凉爽条件下，热适应（V）比dotO（2max）增加5%（66.8 +/-2.1 vs. 70.2 +/-2.3 www.example.com（-1）. min（-1），P = 0.004），在热条件下增加8%（55.1 +/-2.5 vs. 59.6 +/-2.0 ml.kg（-1）. min（-1），P = 0.007）。热习服使时间试验性能在凉爽条件下提高了6%（879.8 +/-48.5 vs. 934.7 +/-50.9 kJ，P = 0.005），在热条件下提高了8%（718.7 +/-42.3 vs. 776.2 +/-50.9 kJ，P = 0.014）。在冷环境中，热适应使乳酸阈值下的功率输出增加5%（3.88 +/-0.82 vs. 4.09 +/-0.76 W/kg，P = 0.002），在热环境中增加5%（3.45 +/-0.80 vs. 3.60 +/-0.79 W/kg，P <0.001）。热适应增加血浆容量（6.5 +/-1.5%）和最大心输出量（分别为9.1 +/-3.4%和4.5 +/-4.6%）。对照组在（V）over dotO（2max）、时间试验性能、乳酸阈值或任何生理参数方面没有变化。这些数据表明，热适应提高了在温凉条件下的有氧运动能力，并提供了科学依据，热适应，以加强体育训练计划。
This study examined the impact of heat acclimation on improving exercise performance in cool and hot environments. Twelve trained cyclists performed tests of maximal aerobic power ((V) over dotO(2max))(,) time-trial performance, and lactate threshold, in both cool [13 degrees C, 30% relative humidity (RH)] and hot (38 degrees C, 30% RH) environments before and after a 10-day heat acclimation (similar to 50% (V) over dotO(2max) in 40 degrees C) program. The hot and cool condition (V) over dotO(2max) and lactate threshold tests were both preceded by either warm (41 degrees C) water or thermoneutral (34 degrees C) water immersion to induce hyperthermia (0.8-1.0 degrees C) or sustain normothermia, respectively. Eight matched control subjects completed the same exercise tests in the same environments before and after 10 days of identical exercise in a cool (13 degrees C) environment. Heat acclimation increased (V) over dotO(2max) by 5% in cool (66.8 +/- 2.1 vs. 70.2 +/- 2.3 ml.kg(-1).min(-1), P = 0.004) and by 8% in hot (55.1 +/- 2.5 vs. 59.6 +/- 2.0 ml.kg(-1).min(-1), P = 0.007) conditions. Heat acclimation improved time-trial performance by 6% in cool (879.8 +/- 48.5 vs. 934.7 +/- 50.9 kJ, P = 0.005) and by 8% in hot (718.7 +/- 42.3 vs. 776.2 +/- 50.9 kJ, P = 0.014) conditions. Heat acclimation increased power output at lactate threshold by 5% in cool (3.88 +/- 0.82 vs. 4.09 +/- 0.76 W/kg, P = 0.002) and by 5% in hot (3.45 +/- 0.80 vs. 3.60 +/- 0.79 W/kg, P < 0.001) conditions. Heat acclimation increased plasma volume (6.5 +/- 1.5%) and maximal cardiac output in cool and hot conditions (9.1 +/- 3.4% and 4.5 +/- 4.6%, respectively). The control group had no changes in (V) over dotO(2max), time-trial performance, lactate threshold, or any physiological parameters. These data demonstrate that heat acclimation improves aerobic exercise performance in temperate-cool conditions and provide the scientific basis for employing heat acclimation to augment physical training programs.