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Susan I. Barr, PhD
University of British Columbia Vancouver

Robert P. Heaney, MD
Creighton University Omaha, Neb

JAMA. 1997;277(1):22-23.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.

—Klesges and colleagues¹ present data that appear to have profound implications for active individuals. Male basketball players lost bone mass during a 1-year period, and it was determined that this was mediated by loss of enormous amounts of calcium through sweat. The following year, with calcium supplementation, bone mass was gained. However, before athletes rush to consume calcium supplements, several important questions must be addressed.

The first questions relate to collection and analysis of sweat samples. The authors state that they followed the procedure described by Tipton et al,² but this does not appear to have occurred. Tipton et al² used the arm-bag method to collect sweat, whereas Klesges et al¹ extracted sweat from T-shirts worn under the athletes' regular jerseys. The authors do not establish that this method provides a valid estimate of sweat calcium concentration, and indeed it seems probable that . . . [Full Text PDF of this Article]

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