Author
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Lukaski, Henry |
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Submitted to: Cell Biology and Toxicology
Publication Type: Abstract Only Publication Acceptance Date: 8/15/2007 Publication Date: 9/1/2008 Citation: Lukaski, H.C. 2008. Mineral losses during extreme environmental conditions [abstract]. Cell Biology and Toxicology. 24(Suppl 1):S122 Interpretive Summary: Technical Abstract: Minerals are nutrients that are conserved by the body. During exposure to environmental stimuli, such as heat and/or exercise, the excretion of minerals, macro (Na, K, Ca, Mg) and micro (Cu, Fe, Zn), occurs through the body surface in the form of cellular desquamation and sweat, as well as in the urine. Whereas it is well established that urinary excretion of minerals increases following physical activity, compared to no activity, there is uncertainty regarding surface mineral losses during acute, compared to prolonged bouts of exercise, as well as on repeated days in a hot environment. Surface losses of minerals, total of cellular and sweat, have been sampled from various sites of the body including upper and lower arm, chest, back, thigh, and forehead by using different collection devices or materials. These losses are expressed as concentrations of minerals (mg/L or ng/L), are appreciable, and show wide intra- and inter-individual variability. In general, conservation of minerals occurs during prolonged and repeated bouts of exercise in the heat. Methods of sweat collection, sources of contamination, differences by sex, and trends of mineral losses in heat acclimated and unacclimated individuals will be presented. The impact of surface losses of minerals on body mineral retention also will be discussed. |
