Metabolic consequences of repeated exercise in long distance runners

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Deutscher übersetzter Titel:Stoffwechselveränderungen durch wiederholte Muskelarbeit bei Langstreckenläufern
Autor:Yoshida, Takayoshi; Watari, Hiroshi
Erschienen in:European journal of applied physiology
Veröffentlicht:67 (1993), 3, S. 261-265, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Gedruckte Ressource Elektronische Ressource (online)
Sprache:Englisch
ISSN:1439-6319, 0301-5548
DOI:10.1007/BF00864226
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Erfassungsnummer:PU199310068001
Quelle:BISp

Abstract des Autors

To assess the rates of change in muscle metabolites such as phosphocreatine (PCr) and inorganic phosphate (Pi) during repeated exercise sessions with rest periods, 31-phosphorus nuclear magnetic resonance spectroscopy was used for continuous and noninvasive measurements. Five long-distance runners and six healthy male subjects as controls performed a 2-min femoral flexion exercise at 20 kg/m/min in a 2.1 T superconducting magnet with a 67-cm bore; they repeated this exercise four times with a 2-min rest period. At the beginning of exercise, PCr decreased exponentially; at the end, it increased. During exercise and in the early phase of the recovery in every exercise session, the PCr values were significantly higher in the long-distance runners than in the control subjects. The Pi increases and decreases involved with exercise also revealed exponential changes. The Pi values did not significantly differ during exercise; however, Pi recovery was faster in the long-distance runners than in the control subjects. The Pi:PCr ratio during exercise increased linearly with exercise; and Pi:PCr during recovery was smaller in the long-distance runners than in the control subjects. In conclusion, the long-distance runners revealed faster PCr and Pi kinetics after exercise and a smaller Pi:PCr during exercise than did the control subjects. It is suggested that these results were attributable to a greater oxidative capacity of muscles in the long-distance runners.