Daniel Snape, Barney Wainwright, Iain T Parsons, Michael J Stacey, David R Woods, John O'Hara
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引用次数: 0
摘要
混合方法热适应(HA)方案可以通过支持训练锥度同时促进热适应来优化性能;然而,对心血管和体液调节的影响,以保护健康是未知的。因此,我们研究了混合方法加热方案对生理反应的影响,包括心血管和液体调节应变与运动热应激,以及在高温下的自定节奏表现。20名铁人三项运动员(15名男性,5名女性)被随机分配到8天的HA (HOT)或在热中性条件下(TEMP)运动。热应力测试(HST)包括在气候室(32°C, 70%相对湿度)中循环45分钟,在第1天,第5天(仅热)和第8天进行。在干预前后,在相同的气候条件下(第0天和第10天)进行骑行计时赛。静息和hst后(仅第1天和第8天)静脉血样本分析儿茶酚胺产物去甲肾上腺素和加压素替代copeptin。HA治疗7天后(第1天vs.第8天),HOT组静息直肠温度显著低于TEMP组(-0.32±0.36°C, P = 0.002)。HA治疗7天后,去甲肾上腺素降低24.3% (P = 0.012), copeptin降低53.4% (HOT vs. TEMP, P = 0.012)。然而,HA没有影响(0.3%,P = 0.984)在高温下的自定节奏性能。混合方法的透明质酸诱导了心血管压力的逐渐减少和流体调节压力的净减少,但没有改善高温下的自我节奏表现。
Seven days of mixed-method heat acclimation improved markers of cardiovascular and fluid-regulatory strain during exercise-heat stress.
A mixed-method heat acclimation (HA) protocol may optimise performance by supporting the training taper while promoting thermal adaptation; however, the impact on cardiovascular and fluid-regulatory adjustments to protect health is unknown. Therefore, we examined the effects of a mixed-method heat protocol on physiological responses, including cardiovascular and fluid-regulatory strain with exercise-heat stress, and self-paced performance in the heat. Twenty (15 males, five females) triathletes were randomised to 8 days of HA (HOT), or exercise in thermoneutral conditions (TEMP). A heat stress test (HST) comprising 45 min of cycling in a climatic chamber (32°C, 70% relative humidity) was performed on days 1, 5 (HOT only) and 8. Before and after the intervention, a cycling time trial was conducted in the same climatic conditions (days 0 and 10). Venous blood samples were analysed at rest and post-HST (days 1 and 8 only) for the catecholamine product normetanephrine and the vasopressin surrogate copeptin. Following 7 days of HA (days 1 vs. 8) resting rectal temperature was significantly lower in the HOT compared to the TEMP group (-0.32 ± 0.36°C, P = 0.002). Normetanephrine was 24.3% lower after 7 days of HA (P = 0.012), and copeptin was 53.4% lower at the post-HST time point (HOT vs. TEMP, P = 0.012). However, HA had no effect (0.3%, P = 0.984) on self-paced performance in the heat. Mixed-method HA elicited a progressive reduction in cardiovascular strain and a net reduction in fluid-regulatory strain without improving self-paced performance in the heat.
期刊介绍:
Experimental Physiology publishes research papers that report novel insights into homeostatic and adaptive responses in health, as well as those that further our understanding of pathophysiological mechanisms in disease. We encourage papers that embrace the journal’s orientation of translation and integration, including studies of the adaptive responses to exercise, acute and chronic environmental stressors, growth and aging, and diseases where integrative homeostatic mechanisms play a key role in the response to and evolution of the disease process. Examples of such diseases include hypertension, heart failure, hypoxic lung disease, endocrine and neurological disorders. We are also keen to publish research that has a translational aspect or clinical application. Comparative physiology work that can be applied to aid the understanding human physiology is also encouraged.
Manuscripts that report the use of bioinformatic, genomic, molecular, proteomic and cellular techniques to provide novel insights into integrative physiological and pathophysiological mechanisms are welcomed.