Acclimation Training Improves Endurance Cycling Performance in the Heat without Inducing Endotoxemia
Acclimation Training Improves Endurance Cycling Performance in the Heat without Inducing Endotoxemia
复制标题
适应训练可提高高温下的耐力骑行表现而不诱发内毒素血症
作者：
J. Guy;D. Pyne;G. Deakin;Catherine M. Miller;A. Edwards
目的：虽然耐力运动员进行短期热训练的目的是在高温下比赛前迅速获得有意义的身体适应，但目前尚不清楚这一过程是否也对免疫系统构成公开的、尖锐的挑战。因此，这项研究的目的是检查热训练对耐力表现和与炎症和免疫系统反应相关的生物标记物的影响。方法：将24名中等运动量的男性随机分为高温组(n=8，35°C和70%RH)、中性组(n=8，20°C和45%RH)和非运动组(CON，n=8)。在18天的研究中，热和中性进行了七次训练(在最大摄氧量为55的情况下骑车40分钟)，所有参与者都完成了在35°C和70%相对湿度下的三次热应激测试(HST)。HST方案包括3×次最大间隔，然后在自行车测功器上进行5公里计时试验。在每次HST前后采集血清样本，检测白细胞介素6、免疫球蛋白M和脂多糖。结果：与基线和2组相比，热组和中性组的5公里计时成绩均有显著改善(热−33±20 S，p=0.02，中性−39±18 S，p=0.01)，但只有热组的速度更快(−45±25 S，−12 S±7 S，p=0.01)。各组运动后白细胞介素6均升高，但免疫球蛋白M和脂多糖无明显变化。结论：短期热训练使中等体能受试者的5公里自行车计时赛成绩提高了~6%，与中性条件下的运动训练幅度相近，而热训练组的3次充值训练使成绩进一步提高了3%。此外，高温训练并未对免疫系统构成实质性挑战。
Purpose: While the intention of endurance athletes undertaking short term heat training protocols is to rapidly gain meaningful physical adaption prior to competition in the heat, it is currently unclear whether or not this process also presents an overt, acute challenge to the immune system. The aim of this study was therefore to examine the effects of heat training on both endurance performance and biomarkers associated with inflammatory and immune system responses. Methods: Moderately-actively males (n = 24) were allocated randomly to either HOT (n = 8, 35°C, and 70% RH; NEUTRAL (n = 8, 20°C, and 45% RH); or a non-exercising control group, (CON, n = 8). Over the 18 day study HOT and NEUTRAL performed seven training sessions (40 min cycling at 55 of VO2 max) and all participants completed three heat stress tests (HST) at 35°C and 70% RH. The HST protocol comprised three × sub-maximal intervals followed by a 5 km time trial on a cycle ergometer. Serum samples were collected before and after each HST and analyzed for interleukin-6, immunoglobulin M and lipopolysaccharide. Results: Both HOT and NEUTRAL groups experienced substantial improvement to 5 km time trial performance (HOT −33 ± 20 s, p = 0.02, NEUTRAL −39 ± 18 s, p = 0.01) but only HOT were faster (−45 ± 25 s, and −12 s ± 7 s, p = 0.01) in HST3 compared to baseline and HST2. Interleukin-6 was elevated after exercise for all groups however there were no significant changes for immunoglobulin M or lipopolysaccharide. Conclusions: Short-term heat training enhances 5 km cycling time trial performance in moderately-fit subjects by ~6%, similar in magnitude to exercise training in neutral conditions.Three top-up training sessions yielded a further 3% improvement in performance for the HOT group. Furthermore, the heat training did not pose a substantial challenge to the immune system.
急性力竭运动对男性细胞因子基因表达的影响。
DOI：
10.1055/s-2007-972850
发表时间：
1996
期刊：
International journal of sports medicine.
影响因子：
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作者：
Natelson,BH;Zhou,X;Ottenweller,JE;Bergen,MT;Sisto,SA;Drastal,S;Tapp,WN;Gause,WL
通讯作者：
Gause,WL