Ventilatory and perceptual habituation achieved with twice-daily, six total brief 12 °C head-out water immersions

IF 2.9 2区 生物学 Q2 BIOLOGY
Afton D. Seeley , Thomas A. Mayer , Shaun C. Brazelton , David H. Gonzalez Rojas , Kathryn G. McCarthy , Phillip O. Bodurtha , Molly E. Heikkinen , Gabrielle E.W. Giersch , MariaLena A. Shaw , Andrew M. Greenfield , Karleigh E. Bradbury , Koby C. Conz , Benjamin J. Ryan , Aaron R. Caldwell , K. Riley Connor , Billie K. Alba , John W. Castellani
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Abstract

Repetitive cold exposure can evoke habituation capable of reducing physiological stress, energy expenditure and improving comfort in the cold. This study sought to evaluate physiological responses to repeated 10-min 12 °C head-out cold immersions to determine whether metabolic habituation with lower temporal burden could be achieved. Fourteen males (25 ± 7 years, 23.8 ± 5.8% body fat) completed two water immersion sequences consisting of twice daily, six total 10-min head-out immersions, one in cold water (CWI, 12.0 ± 0.1 °C) and the other in thermoneutral water (TN, 35.0 ± 0.2 °C). Water immersion was completed twice per day, separated by at least 4 h, for three consecutive days wearing only compression shorts. CWI was unable to induce metabolic habituation evidenced by unchanged oxygen consumption (p = 0.281) across immersions. Six 12 °C CWIs were sufficient to reduce average 10-min VE after just three immersions (IMM4: 22.12 ± 4.68 vs. IMM1: 30.90 ± 14.15 L min−1, p < 0.001), via reduced tidal volume (−0.252 [-0.446 to −0.058] L). Perceptual habituation was achieved, with cold exposure inducing shivering sensation habituation after 2 immersions (p = 0.002), thermal comfort improvement after 4 (p = 0.017), and thermal sensation elevation (p = 0.029) after the completion of 5 head-out immersions. Heart rate, mean arterial blood pressure, change in core temperature, and mean weighted skin temperature did not demonstrate evidence of cold-water habituation. In summary, a total of six 12 °C water head-out immersions provided an adaptive stimulus capable of inducing both ventilatory and perceptual habituation but unable to habituate cardiovascular, metabolic, or thermoregulatory cold response.
通过每天两次,总共6次简短的12°C头部出水浸泡,实现通风和感知习惯
重复的寒冷暴露可以引起习惯化,从而减少生理压力、能量消耗并提高在寒冷中的舒适度。本研究旨在评估反复10分钟12°C头部冷浸泡的生理反应,以确定是否可以实现较低时间负担的代谢习惯化。14名男性(25±7岁,体脂23.8±5.8%)完成了两个水浸泡序列,包括每天两次,6次总共10分钟的头部浸泡,一次在冷水中(CWI, 12.0±0.1°C),另一次在热中性水中(TN, 35.0±0.2°C)。每天两次水浸泡,间隔至少4小时,连续3天只穿压缩短裤。CWI不能诱导代谢习惯,这可以从不同浸泡过程中氧气消耗不变(p = 0.281)得到证明。6个12°C cwi足以在三次浸泡后降低平均10分钟VE (IMM4: 22.12±4.68 vs. IMM1: 30.90±14.15 L min - 1, p <;0.001),通过减少潮汐量(- 0.252[-0.446至- 0.058]L)。实验结果显示,2次浸泡后冷暴露诱导寒战感觉习惯化(p = 0.002), 4次浸泡后热舒适改善(p = 0.017),完成5次头朝外浸泡后热感觉提升(p = 0.029)。心率、平均动脉血压、核心温度变化和平均加权皮肤温度没有显示冷水习惯的证据。总之,总共6次12°C的水浸提供了适应性刺激,能够诱导通气和知觉适应,但不能适应心血管、代谢或体温调节冷反应。
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来源期刊
Journal of thermal biology
Journal of thermal biology 生物-动物学
CiteScore
5.30
自引率
7.40%
发文量
196
审稿时长
14.5 weeks
期刊介绍: The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are: • The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature • The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature • Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause • Effects of temperature on reproduction and development, growth, ageing and life-span • Studies on modelling heat transfer between organisms and their environment • The contributions of temperature to effects of climate change on animal species and man • Studies of conservation biology and physiology related to temperature • Behavioural and physiological regulation of body temperature including its pathophysiology and fever • Medical applications of hypo- and hyperthermia Article types: • Original articles • Review articles
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