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Lead Stories: Friday, November 21, 2008

Q&A: Is it true that weight loss during exercise is normal?

Posted December 29th, 2007 at 2:16 PM by Martin Kennedy

Section: Health & Fitness, Injury & Rehab, Exercise

If you weigh yourself before and after an hour or two of exercise, the difference is likely to be fluid loss. However, in events lasting several hours or even several days, measurable fat loss can occur. At a competitive 12-hour indoor stationary bicycle marathon, one athlete took fluids and food throughout the entire competition, and still lost 2.64 pounds (Schweizerische Rundschau für Medizin Praxis, July 2007).

Of this weight loss, 1.98 pounds was due to loss of fat. His calculated muscle weight increased by 1.46 pounds due to damage to the muscle cells, which results in fluid retention in the cells.
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