咖啡因和牛磺酸共同摄入对疲劳时间和热循环体温调节反应的急性影响。

IF 3
James Aggett, Joe Page, Jenny Peel, Kevin John, Guilherme Matta, Jamie Tallent, Shane Heffernan, Owen Jeffries, Mark Waldron
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引用次数: 0

摘要

咖啡因和牛磺酸通常在运动前同时摄入,但会引起不同的体温调节反应;然而,它们对体温调节的综合作用尚不清楚。因此,我们评估了口服咖啡因和牛磺酸共同摄入对疲劳时间(TTE)和气体交换阈值(GET)下热循环的体温调节反应的影响。10名健康的非热适应参与者参加了一项双盲交叉研究,在高温(35°C; 40%相对湿度)下完成TTE,在摄入咖啡因(5 mg/kg)和牛磺酸(50 mg/kg)联合或安慰剂1小时后,以与GET相关的功率输出循环。整个过程中记录肺气体交换、核心和平均皮肤温度以及全身出汗率(WBSR)。产热用部分量热法测定。两组间TTE差异无统计学意义(p = 0.608);然而,补充后的耗氧量(p = 0.017)、分钟通气量(p = 0.029)和产热量(p = 0.019)较高。皮肤(p = 0.539)、核心温度(p = 0.699)、平均皮肤血流量(p = 0.119)、呼吸交换比(p = 0.546)和WBSR (p = 0.897)差异无统计学意义。运动前在高温下同时摄入咖啡因和牛磺酸,尽管增加了通气和代谢需求,但没有产生人体产生的影响。总的来说,这些数据表明对全身体温调节的影响很小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Acute Effects of Caffeine and Taurine Co-Ingestion on Time to Exhaustion and Thermoregulatory Responses to Cycling in the Heat

Acute Effects of Caffeine and Taurine Co-Ingestion on Time to Exhaustion and Thermoregulatory Responses to Cycling in the Heat

Caffeine and taurine are commonly co-ingested pre-exercise but elicit different thermoregulatory responses; however, their combined effect on thermoregulation is unknown. Therefore, we evaluated the effects of oral caffeine and taurine co-ingestion on time to exhaustion (TTE) and thermoregulatory responses to cycling in the heat at the gas exchange threshold (GET). Ten healthy nonheat acclimated participants took part in a double-blind crossover study, completing a TTE in the heat (35°C; 40% relative humidity), cycling at a power output associated with the GET and 1 h after ingesting: caffeine (5 mg/kg) and taurine (50 mg/kg) combined or placebo. Pulmonary gas exchange, core and mean skin temperatures and whole-body sweat rate (WBSR) were recorded throughout. Heat production was determined using partitional calorimetry. There were no differences in TTE between conditions (p = 0.608); however, the rate of oxygen consumption (p = 0.017), minute ventilation (p = 0.029) and heat production (p = 0.019) were higher following the supplement. There were no differences between conditions for skin (p = 0.539) and core temperature (p = 0.699), mean skin blood flow (p = 0.119), respiratory exchange ratio (p = 0.546) and WBSR (p = 0.897). Pre-exercise co-ingestion of caffeine and taurine in the heat had no ergogenic effect despite increasing the ventilatory and metabolic demand. Collectively, these data indicate minimal effects on whole-body thermoregulation.

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