The Center of Inflammation and Metabolism and the Center for Physical Activity Research, Rigshospitalet, University of Copenhagen, Copenhagen 2100, Denmark.
Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark.
Cell Rep Med. 2021 Oct 11;2(10):100408. doi: 10.1016/j.xcrm.2021.100408. eCollection 2021 Oct 19.
The Scandinavian winter-swimming culture combines brief dips in cold water with hot sauna sessions, with conceivable effects on body temperature. We study thermogenic brown adipose tissue (BAT) in experienced winter-swimming men performing this activity 2-3 times per week. Our data suggest a lower thermal comfort state in the winter swimmers compared with controls, with a lower core temperature and absence of BAT activity. In response to cold, we observe greater increases in cold-induced thermogenesis and supraclavicular skin temperature in the winter swimmers, whereas BAT glucose uptake and muscle activity increase similarly to those of the controls. All subjects demonstrate nocturnal reduction in supraclavicular skin temperature, whereas a distinct peak occurs at 4:30-5:30 a.m. in the winter swimmers. Our data leverage understanding of BAT in adult human thermoregulation, suggest both heat and cold acclimation in winter swimmers, and propose winter swimming as a potential strategy for increasing energy expenditure.
斯堪的纳维亚冬季游泳文化将短暂浸入冷水中与热桑拿相结合，对体温可能产生影响。我们研究了每周进行 2-3 次这种活动的经验丰富的冬季游泳男性的产热棕色脂肪组织 (BAT)。与对照组相比，我们的数据表明冬季游泳者的热舒适状态较低，核心温度较低且 BAT 活动不存在。为了应对寒冷，我们观察到冬季游泳者的冷诱导产热和锁骨上皮肤温度增加更大，而 BAT 葡萄糖摄取和肌肉活动增加与对照组相似。所有受试者夜间锁骨上皮肤温度均降低，而冬季游泳者在凌晨 4:30-5:30 出现明显高峰。我们的数据利用了对成人体温调节中 BAT 的理解，表明冬季游泳者既适应了热又适应了冷，并提出冬季游泳可能是增加能量消耗的一种策略。
