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Acute weight loss followed by an aggressive nutritional recovery strategy has little impact on on-water rowing performance
  1. G Slater1,
  2. A J Rice1,
  3. R Tanner1,
  4. K Sharpe2,
  5. C J Gore1,
  6. D G Jenkins3,
  7. A G Hahn1
  1. 1Australian Institute of Sport, Canberra, ACT, Australia
  2. 2University of Melbourne, Melbourne, Victoria, Australia
  3. 3University of Queensland, Brisbane, Queensland, Australia
  1. Correspondence to:
 Dr Rice
 Australian Institute of Sport, Canberra, ACT, Australia; tony.rice{at}ausport.gov.au

Abstract

Objectives: To assess the influence of moderate, acute weight loss on on-water rowing performance when aggressive nutritional recovery strategies were used in the two hours between weigh in and racing.

Methods: Competitive rowers (n  =  17) undertook three on-water 1800 m time trials under cool conditions (mean (SD) temperature 8.4 (2.0)°C), each separated by 48 hours. No weight limit was imposed for the first time trial—that is, unrestricted body mass (UNR1). However, one of the remaining two trials followed a 4% loss in body mass in the previous 24 hours (WT−4%). No weight limit was imposed for the other trial (UNR2). Aggressive nutritional recovery strategies (WT−4%, 2.3 g/kg carbohydrate, 34 mg/kg Na+, and 28.4 ml/kg fluid; UNR, ad libitum) were used in the first 90 minutes of the two hours between weigh in and performance trials.

Results: WT−4% had only a small and statistically non-significant effect on the on-water time trial performance (mean 1.0 second, 95% confidence interval (CI) −0.9 to 2.8; p  =  0.29) compared with UNR. This was despite a significant decrease in plasma volume at the time of weigh in for WT−4% compared with UNR (−9.2%, 95% CI −12.8% to −5.6%; p<0.001).

Conclusions: Acute weight loss of up to 4% over 24 hours, when combined with aggressive nutritional recovery strategies, can be undertaken with minimal impact on on-water rowing performance, at least in cool conditions.

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Footnotes

  • Competing interests: none declared

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