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
{"title":"Ventilatory and perceptual habituation achieved with twice-daily, six total brief 12 °C head-out water immersions","authors":"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","doi":"10.1016/j.jtherbio.2025.104216","DOIUrl":null,"url":null,"abstract":"<div><div>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 (<em>p</em> = 0.281) across immersions. Six 12 °C CWIs were sufficient to reduce average 10-min V<sub>E</sub> after just three immersions (IMM4: 22.12 ± 4.68 vs. IMM1: 30.90 ± 14.15 L min<sup>−1</sup>, <em>p</em> < 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 (<em>p</em> = 0.002), thermal comfort improvement after 4 (<em>p</em> = 0.017), and thermal sensation elevation (<em>p</em> = 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.</div></div>","PeriodicalId":17428,"journal":{"name":"Journal of thermal biology","volume":"132 ","pages":"Article 104216"},"PeriodicalIF":2.9000,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of thermal biology","FirstCategoryId":"99","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306456525001731","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"BIOLOGY","Score":null,"Total":0}
引用次数: 0
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.
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