Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Sweat rate and sodium loss during work in the heat | Journal of Occupational Medicine and Toxicology BioMed Central Research Sweat rate and sodium loss during work in the heat Graham P Bates and Veronica S Miller Address School of Public Health Curtin University of Technology Perth Western Australia Email Graham P Bates - Veronica S Miller - Corresponding author Open Access Published 29 January 2008 Received 3 I October 2007 Journal of Occupational Medicine and Toxicology 2008 3 4 doi 1745-6673-3-4 Accepted 29 January 2008 This article is available from http content 3 1 4 2008 Bates and Miller licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Objective Significant and poorly documented electrolyte losses result from prolonged sweating. This study aimed to quantify likely sodium losses during work in heat. Methods Male subjects exercised in an environmental chamber on two consecutive days in both winter and summer. Sweat collecting devices were attached to the upper arms and legs. Results Sweat rates were higher and sodium concentrations were lower in the summer acclimatised than the winter unacclimatised trials. Sweat sodium concentration was reduced on the second day in summer but not winter. Regional differences were found in both seasons. Conclusion The difference between days in summer probably reflects short-term acclimation. The difference between seasons reflects acclimatisation. The data predict average sodium Na losses over a work shift of g equivalent to 10-15 g salt NaCl . Losses are potentially greater in unacclimatised individuals. Fluid and electrolyte losses resulting from prolonged sweating must be replaced to prevent imbalance in body fluids however guidelines for this .
