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Impact of Acute Weight Loss and/or Thermal Stress on Rowing Ergometer Performance
Journal article   Peer reviewed

Impact of Acute Weight Loss and/or Thermal Stress on Rowing Ergometer Performance

Gary J Slater, A J Rice, K Sharpe, R Tanner, David G Jenkins, C J Gore and A G Hahn
Medicine and Science in Sports and Exercise, Vol.37(8), pp.1387-1394
2005
DOI: https://doi.org/10.1249/01.mss.0000174900.13358.7e
PMID: 16118587
url
https://doi.org/10.1249/01.mss.0000174900.13358.7eView
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Abstract

Human Movement and Sports Science Nutrition and Dietetics weight loss rowing thermal stress
Purpose: The impact of acute weight loss on rowing performance was assessed when generous nutrient intake was provided in 2 h of recovery after making weight. Methods: Competitive rowers (N = 17) completed four ergometer trials, each separated by 48 h. Two trials were performed after a 4% body mass loss in the previous 24 h (WT) and two were performed after no weight restrictions, that is, unrestricted (UNR). In addition, two trials (1 × WT, 1 × UNR) were in a thermoneutral environment (NEUTRAL, mean 21.1 ± SD 0.7°C, 29.0 ± 4.5% RH) and two were in the heat (HOT 32.4, ± 0.4°C, 60.4 ± 2.7% RH). Trials were performed in a counterbalanced fashion according to a Latin square design. Aggressive nutritional recovery strategies (WT 2.3 g·kg-1 carbohydrate, 34 mg·kg-1 Na, 28.4 mL·kg-1 fluid; UNR ad libitum) were employed in the 2 h after weigh-in. Results: Both WT (mean 2.1, 95% CI 0.7-3.4 s; P = 0.003) and HOT (4.1, 2.7 - 5.4 s; P < 0.001) compromised 2000-m time-trial performance. Whereas WT resulted in hypohydration, the associated reduction in plasma volume explained only part of the performance compromise observed (0.2 s for every 1% decrement) Moreover, WT did not influence core temperature or indices of cardiovascular function. Conclusions: Acute weight loss compromised performance, despite generous nutrient intake in recovery, although the effect was small. Performance decrements were further exacerbated when exercise was performed in the heat.

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