Hydration Status and Sodium Balance of Endurance Runners Consuming Postexercise Supplements of Varying Nutrient Content

Int J Sport Nutr Exerc Metab. 2015 Oct;25(5):471-9. doi: 10.1123/ijsnem.2014-0231. Epub 2015 Mar 26.

Abstract

Postexercise protein and sodium supplementation may aid recovery and rehydration. Preserved beef provides protein and contains high quantities of sodium that may alter performance related variables in runners. The purpose of this study was to determine the effects of consuming a commercial beef product postexercise on sodium and water balance. A secondary objective was to characterize effects of the supplementation protocols on hydration, blood pressure, body mass, and running economy. Eight trained males (age = 22 ± 3 y, VO2max = 66.4 ± 4.2 ml·kg-1·min-1) completed three identical weeks of run training (6 run·wk-1, 45 ± 6 min·run-1, 74 ± 5% HRR). After exercise, subjects consumed either, a beef nutritional supplement (beef jerky; [B]), a standard recovery drink (SRD), or SRD+B in a randomized counterbalanced design. Hydration status was assessed via urinary biomarkers and body mass. No main effects of treatment were observed for 24 hr urine volume (SRD, 1.7 ± 0.5; B, 1.8 ± 0.6; SRD+B, 1.4 ± 0.4 L·d-1), urine specific gravity (1.016 ± 0.005, 1.018 ± 0.006, 1.017 ± 0.006) or body mass (68.4 ± 8.2, 68.3 ± 7.7, 68.2 ± 8.1 kg). No main effect of treatment existed for sodium intake-loss (-713 ± 1486; -973 ± 1123; -980 ± 1220 mg·d-1). Mean arterial pressure (81.0 ± 4.6, 81.1 ± 7.3, 83.8 ± 5.4 mm Hg) and average exercise running economy (VO2: SRD, 47.9 ± 3.2; B, 47.2 ± 2.6; SRD+B, 46.2 ± 3.4 ml·kg-1·min-1) was not affected. Urinary sodium excretion accounted for the daily sodium intake due to the beef nutritional supplement. Findings suggest the commercial beef snack is a viable recovery supplement following endurance exercise without concern for hydration status, performance decrements, or cardiovascular consequences.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Athletic Performance / physiology
  • Blood Pressure
  • Body Mass Index
  • Cross-Over Studies
  • Dehydration / diet therapy
  • Dehydration / etiology
  • Dietary Carbohydrates / administration & dosage
  • Dietary Supplements*
  • Drinking
  • Exercise Tolerance
  • Humans
  • Male
  • Meat Products*
  • Oxygen Consumption
  • Physical Endurance
  • Random Allocation
  • Red Meat
  • Running / physiology*
  • Sodium / urine
  • Sodium, Dietary / administration & dosage*
  • Sports Nutritional Physiological Phenomena / physiology
  • Water-Electrolyte Balance / physiology*
  • Young Adult

Substances

  • Dietary Carbohydrates
  • Sodium, Dietary
  • Sodium