Branched-chain amino acid supplementation during trekking at high altitude
Deutscher übersetzter Titel: | Supplementierung mit verzweigtkettigen Aminosäuren während des Trekkings in großer Höhe |
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Autor: | Schena, F.; Guerrini, F.; Tregnaghi, P.; Kayser, B. |
Erschienen in: | European journal of applied physiology |
Veröffentlicht: | 65 (1992), 5, S. 394-398, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 1439-6319, 0301-5548 |
DOI: | 10.1007/BF00243503 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199309060627 |
Quelle: | BISp |
Abstract des Autors
To investigate the influence of a branched-chain amino acid (BCAA) supplementation on chronic hypoxia-related loss of body mass and muscle loss, 16 subjects <age 35.8 (SD 5.6) years> participating in a 21-day trek at a mean altitude of 3,255 (SD 458) m, were divided in two age-, sex- and fitness-matched groups and took either a dietary supplementation of BCAA (5.76, 2.88 and 2.88 g per day of leucine, isoleucine and valine, respectively) or a placebo (PLAC) in a controlled double-blind manner. Daily energy intake at altitude decreased by 4 in both groups compared with sea level. After altitude exposure both groups showed a significant loss of body mass, 1.7 and 2.8 for BCAA and PLAC, respectively. Fat mass had decreased significantly by 11.7 for BCAA and 10.3 for PLAC, whereas BCAA showed a significantly increased lean mass of 1.5, as opposed to no change in PLAC. Arm muscle cross-sectional area tended to increase in BCAA, whereas there was a significant decrease of 6.8 in PLAC (P<0.05 between groups). The same tendency, although not significant, was observed for the thigh muscle cross-sectional area. On the whole it seemed that PLAC had been catabolizing whereas BCAA had been synthesizing muscle tissue. Single jump height from a squatted position showed a similar tendency to increase in both groups. Lower limb maximal power decreased less in BCAA than in PLAC (2.4 vs 7.8,P<0.05). We concluded that BCAA supplementation may prevent muscle loss during chronic hypobaric hypoxia.