"Although there may be potential detrimental effects of elevated sodium intake, endurance athletes who typically lose > 2% of body mass during exercise should supplement with electrolytes in fluids to replace sweat losses (Shirreffs, 2001). Sodium loss rates of ~3 g·h -1 have been documented during outdoor exercise bouts (Bergeron, 2003) therefore sodium intake above the recommended DRI of 1.5 g·d -1 may be considered safe and necessary (Komaroff, 2012). Therefore, the purpose of this study was to determine the effects of daily postexercise consumption of B on markers of hydration, running economy, and blood pressure in trained male runners. "
[Show abstract][Hide abstract] ABSTRACT: Post-exercise protein and sodium supplementation may aid recovery and rehydration. Preserved beef provides protein and contains high quantities of sodium that may alter t performance related variables in runners. The purpose of this study was to determine the effects of consuming a commercial beef product post-exercise 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 hour 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) 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.
International Journal of Sport Nutrition and Exercise Metabolism 03/2015; DOI:10.1123/ijsnem.2014-0231 · 2.44 Impact Factor
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