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ScientificWorldJournal. 2014;2014:307421. doi: 10.1155/2014/307421. Epub 2014 Dec 31.

Sauna-induced body mass loss in young sedentary women and men.

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Department of Physical Education and Sport, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 7, 10-720 Olsztyn, Poland.
Jozef Rusiecki Olsztyn University College, Bydgoska 33, 10-243 Olsztyn, Poland.
Department of Heavy Duty Machines and Research Methodology, Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, Oczapowskiego 11, 10-719 Olsztyn, Poland.


The aim of the study was to evaluate the relationship between body mass index (BMI) and body mass loss (BML) induced by thermal stress in a dry sauna. The study was conducted on a group of 674 sedentary students, 326 women and 348 men aged 19-20. The correlations between BMI scores and BML were determined. The subjects were placed in supine position in a dry sauna for two sessions of 10 minutes each with a 5-minute break. The influence of BMI on the amount of BML in the sauna was determined by nonlinear stepwise regression. The smallest BML was noted in underweight subjects; students with normal weight lost more weight, whereas the greatest BML was reported in overweight and obese subjects. Persons with a high BMI are at higher risk of dehydration, and they should pay particular attention to replenishing fluids during a visit to the sauna. The proposed equations for calculating BML based on a person's BMI can be useful in estimating the amount of fluids that should be replenished by both men and women during a visit to a dry sauna.

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