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首页> 美国卫生研究院文献>Nutrients >Effects of Casein Hydrolysate Ingestion on Thermoregulatory Responses in Healthy Adults during Exercise in Heated Conditions: A Randomized Crossover Trial
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Effects of Casein Hydrolysate Ingestion on Thermoregulatory Responses in Healthy Adults during Exercise in Heated Conditions: A Randomized Crossover Trial

机译：酪蛋白水解物摄入对加热条件下健康成年人运动过程中体温调节反应的影响：一项随机交叉试验

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摘要

Food ingestion has been shown to affect thermoregulation during exercise, while the impact of protein degradant consumption remains unclear. We investigated the effects of casein hydrolysate ingestion on thermoregulatory responses during exercise in the heat. In a randomized, placebo-controlled, double-blind, crossover trial, five men and five women consumed either 5 g of casein hydrolysate or placebo. Thirty minutes after ingestion, participants cycled at 60% VO max until voluntary exhaustion wearing a hot-water (43 °C) circulation suit. Exercise time to exhaustion, body core temperature, forearm sweat rate, and forearm cutaneous vascular conductance did not differ different between the conditions. However, chest sweat rate and mean skin temperature increased upon casein hydrolysate ingestion compared with placebo during exercise. Increased chest sweat rate upon casein hydrolysate ingestion was associated with elevated sudomotor sensitivity to increasing body core temperature, but not the temperature threshold for initiating sweating. A positive correlation was found between chest sweat rate and plasma total amino acid concentration during exercise. These results suggest that casein hydrolysate ingestion enhances sweating heterogeneously by increasing peripheral sensitivity of the chest’s sweating mechanism and elevating skin temperature during exercise in the heat. However, the physiological link between plasma amino acid concentration and sweat rate remains unclear.
机译：事实证明，食物摄入会影响运动过程中的体温调节，而蛋白质降解物消耗的影响尚不清楚。我们调查了酪蛋白水解物摄入对热运动过程中体温调节反应的影响。在一项随机，安慰剂对照，双盲，交叉试验中，五名男子和五名妇女食用了5克酪蛋白水解物或安慰剂。摄入后30分钟，参与者以最大60％VO循环骑行，直到自愿疲倦，穿着热水（43°C）循环服。在不同情况下，运动至疲惫的时间，体温，前臂出汗率和前臂皮肤血管电导率没有差异。但是，与运动期间服用安慰剂相比，摄入酪蛋白水解物后胸部出汗率和平均皮肤温度升高。酪蛋白水解物摄入后增加的胸汗速率与对体核温度升高的sudomotor敏感性增加有关，但与开始出汗的温度阈值无关。在运动期间胸汗率与血浆总氨基酸浓度之间发现正相关。这些结果表明，酪蛋白水解物的摄入通过增加胸部出汗机制的周围敏感性以及在高温运动中升高皮肤温度来异质地增加出汗。但是，血浆氨基酸浓度和出汗率之间的生理联系仍然不清楚。

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