Effect of chronic endurance exercise on retention of dietary protein

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Deutscher übersetzter Titel:Die Auswirkung kontinuierlichen Ausdauertrainings auf die Zurueckbehaltung von Ernaehrungseiweiss
Autor:Friedmann, J.E.; Lemon, P.W.R.
Erschienen in:International journal of sports medicine
Veröffentlicht:10 (1989), 2, S. 118-123, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:0172-4622, 1439-3964
DOI:10.1055/s-2007-1024886
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Erfassungsnummer:PU198910038365
Quelle:BISp

Abstract

On two separate occasions, five well-trained endurance runners consumed a meat-free diet for 6 days. For one trial the subjects consumed the recommended dietary allowance (RDA) of protein (REC-PRO = 0.86 +/- 0.23 g/kg body wt/day). Protein intake for the other trial was 1.7 times higher (HI-PRO = 1.49 +/- 0.29 g/kg body wt/day). Each subject followed his regular training program (12-16 km running/day), and on day 5 of each diet completed a treadmill run at a similar intensity and duration (75 min at 72 V02max). Seventy-two hour urinary urea N loss (days 4, 5, and 6 of each diet) and day 5 exercise sweat urea N excretion were measured. Serum urea N and creatinine increased significantly during the treadmill run under both dietary conditions. No significances between diet differences were observed in sweat or urinary urea N excretion; however, excretion of both tended to be higher on the REC-PRO diet than on the HI-PRO diet. The differences in protein intake combined with the nitrogen excretion measures resulted in significant differences in estimated whole-body nitrogen retention between the two treatments. Nitrogen retention remained positive during HI-PRO trial (2.41 +/- 1.99 g/day) but was significantly reduced to -5.29 +/- 2.58 g/day during the REC-PRO trial. These results suggest that the current protein RDA may be inadequate for athletes engaging in chronik high-intensity endurance exercise. Future studies are needed to confirm this observation. Verf.-Referat