Physiological Effects of Weight Cycling in Female Lightweight Rowers
- 1 September 1993
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Applied Physiology
- Vol. 18 (3), 291-303
- https://doi.org/10.1139/h93-025
Abstract
Repeated cycles of weight loss and regain are referred to as weight cycling. It is a practice of many athletes who must achieve a low body weight. The purpose of this study was to determine whether a history of weight cycling results in sustained metabolic changes. Healthy female rowers with a history of dieting and weight fluctuation (n = 7) were compared to a control group of rowers who had never dieted (n = 7). Anthropometric and metabolic measurements were done at pre-, peak, and off-season during a 1-year period. At peak season the weight cyclers restricted their food intake and lost 4.2 ± 1.8 kg, and subsequently regained 4.0 ± 2.1 kg in the off-season. This was different from the controls (p =.003), who maintained a stable body weight at all times. No other group differences were observed. Resting metabolic rate (RMR) and triiodothyronine (T3) changed with time (p =.001, p =.000, respectively) in both groups, which appeared to reflect changes in fat free mass (FFM), not body weight. Long-term metabolic changes were not observed in these athletes. Key words: weight cycling, metabolic rate, body composition, rowersKeywords
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