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The Scientific World Journal
Volume 2014, Article ID 307421, 7 pages
Research Article

Sauna-Induced Body Mass Loss in Young Sedentary Women and Men

1Department of Physical Education and Sport, University of Warmia and Mazury in Olsztyn, Prawocheńskiego 7, 10-720 Olsztyn, Poland
2Jozef Rusiecki Olsztyn University College, Bydgoska 33, 10-243 Olsztyn, Poland
3Department of Heavy Duty Machines and Research Methodology, Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, Oczapowskiego 11, 10-719 Olsztyn, Poland

Received 16 July 2014; Revised 29 October 2014; Accepted 17 December 2014; Published 31 December 2014

Academic Editor: Pedro Moreira

Copyright © 2014 Robert Podstawski et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.