Adding polylactate to a glucose polymer solution does not improve endurance
Deutscher übersetzter Titel: | Der Zusatz von Polylaktat zu einem Glukosepolymerdrink verbessert die Ausdauerleistung nicht |
---|---|
Autor: | Swensen, T.; Crater, G.; Bassett, D.R.; Howley, E.T. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 15 (1994), 7, S. 430-434, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-1021083 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199511103514 |
Quelle: | BISp |
Abstract des Autors
Polylactate (PL), a semi-soluble amino acid/lactate salt, is a newly developed carbohydrate supplement purported to increase endurance. Our purpose was to determine if the addition of PL to a glucose polymer solution (GP) extends exercise time relative to a pure GP solution. In a double blind and random crossover design, 5 subjects exercised twice to exhaustion at 70% of VO2max. During the trials, they consumed GP or a GP/PL mixture at the rate of 0.3 g carbohydrate per kg of body wt in a 7% solution every 20 min until exhaustion. The GP/PL mixture contained 6.25 g GP to 0.75 g PL per 100 ml of water. Mixture composition was critical because PL, as supplied by the manufacturer and under our experimental conditions, produced severe gastro-intestinal efflux in concentrations >/- 2.5%; PL was tolerable in concentrations </- 0.75%. At 20 min intervals, we measured VO2, respiratory exchange ratio, heart rate, and perceived exertion. At 30 min intervals, we measured serum glucose, insulin, free fatty acids, and glycerol as well as whole blood lactate and pH. We found that the addition of PL to a GP solution had no measurable physiological or performance effects. Verf.-Referat