title: Human whole body cold adaptation.
abstract: Reviews on whole body human cold adaptation generally do not distinguish between population studies and dedicated acclimation studies, leading to confusing results. Population studies show that indigenous black Africans have reduced shivering thermogenesis in the cold and poor cold induced vasodilation in fingers and toes compared to Caucasians and Inuit. About 40,000 y after humans left Africa, natives in cold terrestrial areas seems to have developed not only behavioral adaptations, but also physiological adaptations to cold. Dedicated studies show that repeated whole body exposure of individual volunteers, mainly Caucasians, to severe cold results in reduced cold sensation but no major physiological changes. Repeated cold water immersion seems to slightly reduce metabolic heat production, while repeated exposure to milder cold conditions shows some increase in metabolic heat production, in particular non-shivering thermogenesis. In conclusion, human cold adaptation in the form of increased metabolism and insulation seems to have occurred during recent evolution in populations, but cannot be developed during a lifetime in cold conditions as encountered in temperate and arctic regions. Therefore, we mainly depend on our behavioral skills to live in and survive the cold.
authors.affiliation: MOVE Research Institute, Faculty of Behavioral and Movement Sciences, VU University Amsterdam, The Netherlands; TNO, Soesterberg, The Netherlands; Amsterdam University of Applied Sciences, Amsterdam, The Netherlands.
authors.forename: Hein A M
authors.initials: HA
authors.lastname: Daanen
authors.affiliation: Department of Human Biology/Movement Sciences, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University , The Netherlands.
authors.forename: Wouter D
authors.initials: WD
authors.lastname: Van Marken Lichtenbelt
keywords: acclimation; adaptation; brown fat; cold; cold induced vasodilation; cold water immersion; human; non-shivering thermogenesis; shivering