{"title":"雪橇犬运动前后的热关系。","authors":"Kailey D. Paul, Ana Gabriela Jiménez","doi":"10.1002/jez.2809","DOIUrl":null,"url":null,"abstract":"<p>Regulation of internal body temperature (T<sub>b</sub>), or thermoregulation, is an evolutionarily conserved trait that places demand on basal metabolic rate of endothermic animals. Across species, athletes generate increased quantities of heat in comparison to their nonathletic counterparts and, therefore, must mediate physiological unbalance by upregulating the effectiveness of their heat dissipation abilities. Canine athletes are no exception to this phenomenon, however, with literature denoting body temperatures lower than nonathletic canines, it is clear they must possess adaptations to mitigate this demand. With VO<sub>2</sub> max measurements of more than 200 mL/kg/min in sled dogs with mild training to 300 mL/kg/min in highly trained animals, sled dogs are a prime example of athleticism in canines. Seeking to determine correlations between T<sub>ear</sub> and body mass, morphology, and age of canine athletes, core body temperature (T<sub>b</sub>) was measured with an instant ear thermometer, using T<sub>ear</sub> as a correlate before and after a 2-mile run. In addition, we employed thermal imaging analysis to capture body-wide heat dissipation patterns in sled dogs, and focused on thermal variation of mouth (T<sub>mouth</sub>), nose (T<sub>nose</sub>), and eyes (T<sub>eye</sub>). Furthermore, we looked at correlations between thermal variability across these four tissues and head morphology of each dog. T<sub>ear</sub> was consistently the highest temperature across all tissues measured, with a 1.5°C increase between pre- to postexercise (<i>p</i> < 0.001). Thermal imaging revealed significant positive correlations between T<sub>mouth</sub> and body mass 15 min postexercise (<i>p</i> = 0.0023) as well as significantly negative correlations between T<sub>nose</sub> and body mass at before exercise (<i>p</i> = 0.0468), T<sub>eye</sub> and nose length after run (<i>p</i> = 0.0076), and T<sub>mouth</sub> and nose length after run (<i>p</i> = 0.0110). As body temperature rises during exercise, it becomes increasingly important to regulate blood flow throughout the body to supply working tissues with oxygen. This demand is offset by the role of the snout in evaporative cooling through panting, functioning as a prime location for heat dissipation and therefore maintaining significant relationships with many other vascularized tissues.</p>","PeriodicalId":15711,"journal":{"name":"Journal of experimental zoology. Part A, Ecological and integrative physiology","volume":"341 5","pages":"606-614"},"PeriodicalIF":1.9000,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Thermal relations in sled dogs before and after exercise\",\"authors\":\"Kailey D. Paul, Ana Gabriela Jiménez\",\"doi\":\"10.1002/jez.2809\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Regulation of internal body temperature (T<sub>b</sub>), or thermoregulation, is an evolutionarily conserved trait that places demand on basal metabolic rate of endothermic animals. Across species, athletes generate increased quantities of heat in comparison to their nonathletic counterparts and, therefore, must mediate physiological unbalance by upregulating the effectiveness of their heat dissipation abilities. Canine athletes are no exception to this phenomenon, however, with literature denoting body temperatures lower than nonathletic canines, it is clear they must possess adaptations to mitigate this demand. With VO<sub>2</sub> max measurements of more than 200 mL/kg/min in sled dogs with mild training to 300 mL/kg/min in highly trained animals, sled dogs are a prime example of athleticism in canines. Seeking to determine correlations between T<sub>ear</sub> and body mass, morphology, and age of canine athletes, core body temperature (T<sub>b</sub>) was measured with an instant ear thermometer, using T<sub>ear</sub> as a correlate before and after a 2-mile run. In addition, we employed thermal imaging analysis to capture body-wide heat dissipation patterns in sled dogs, and focused on thermal variation of mouth (T<sub>mouth</sub>), nose (T<sub>nose</sub>), and eyes (T<sub>eye</sub>). Furthermore, we looked at correlations between thermal variability across these four tissues and head morphology of each dog. T<sub>ear</sub> was consistently the highest temperature across all tissues measured, with a 1.5°C increase between pre- to postexercise (<i>p</i> < 0.001). Thermal imaging revealed significant positive correlations between T<sub>mouth</sub> and body mass 15 min postexercise (<i>p</i> = 0.0023) as well as significantly negative correlations between T<sub>nose</sub> and body mass at before exercise (<i>p</i> = 0.0468), T<sub>eye</sub> and nose length after run (<i>p</i> = 0.0076), and T<sub>mouth</sub> and nose length after run (<i>p</i> = 0.0110). As body temperature rises during exercise, it becomes increasingly important to regulate blood flow throughout the body to supply working tissues with oxygen. This demand is offset by the role of the snout in evaporative cooling through panting, functioning as a prime location for heat dissipation and therefore maintaining significant relationships with many other vascularized tissues.</p>\",\"PeriodicalId\":15711,\"journal\":{\"name\":\"Journal of experimental zoology. Part A, Ecological and integrative physiology\",\"volume\":\"341 5\",\"pages\":\"606-614\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2024-03-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of experimental zoology. 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Thermal relations in sled dogs before and after exercise
Regulation of internal body temperature (Tb), or thermoregulation, is an evolutionarily conserved trait that places demand on basal metabolic rate of endothermic animals. Across species, athletes generate increased quantities of heat in comparison to their nonathletic counterparts and, therefore, must mediate physiological unbalance by upregulating the effectiveness of their heat dissipation abilities. Canine athletes are no exception to this phenomenon, however, with literature denoting body temperatures lower than nonathletic canines, it is clear they must possess adaptations to mitigate this demand. With VO2 max measurements of more than 200 mL/kg/min in sled dogs with mild training to 300 mL/kg/min in highly trained animals, sled dogs are a prime example of athleticism in canines. Seeking to determine correlations between Tear and body mass, morphology, and age of canine athletes, core body temperature (Tb) was measured with an instant ear thermometer, using Tear as a correlate before and after a 2-mile run. In addition, we employed thermal imaging analysis to capture body-wide heat dissipation patterns in sled dogs, and focused on thermal variation of mouth (Tmouth), nose (Tnose), and eyes (Teye). Furthermore, we looked at correlations between thermal variability across these four tissues and head morphology of each dog. Tear was consistently the highest temperature across all tissues measured, with a 1.5°C increase between pre- to postexercise (p < 0.001). Thermal imaging revealed significant positive correlations between Tmouth and body mass 15 min postexercise (p = 0.0023) as well as significantly negative correlations between Tnose and body mass at before exercise (p = 0.0468), Teye and nose length after run (p = 0.0076), and Tmouth and nose length after run (p = 0.0110). As body temperature rises during exercise, it becomes increasingly important to regulate blood flow throughout the body to supply working tissues with oxygen. This demand is offset by the role of the snout in evaporative cooling through panting, functioning as a prime location for heat dissipation and therefore maintaining significant relationships with many other vascularized tissues.
期刊介绍:
The Journal of Experimental Zoology – A publishes articles at the interface between Development, Physiology, Ecology and Evolution. Contributions that help to reveal how molecular, functional and ecological variation relate to one another are particularly welcome. The Journal publishes original research in the form of rapid communications or regular research articles, as well as perspectives and reviews on topics pertaining to the scope of the Journal. Acceptable articles are limited to studies on animals.