Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Skeletal muscle metabolic and ionic adaptations during intense exercise following sprint training in humans
Ist Teil von
Journal of applied physiology (1985), 2000-11, Vol.89 (5), p.1793-1803
Ort / Verlag
Bethesda, MD: Am Physiological Soc
Erscheinungsjahr
2000
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
1 School of Exercise and Sport Science, The University of
Sydney, Lidcombe, 1825; 2 School of Human Movement,
Recreation and Performance, and 3 Exercise Metabolism Unit,
School of Life Science and Technology, Centre for Rehabilitation,
Exercise, and Sport Science, Victoria University of Technology,
Footscray, 8011; and 4 School of Health Sciences, Deakin
University, Burwood, 3125, Australia
The effects of sprint
training on muscle metabolism and ion regulation during intense
exercise remain controversial. We employed a rigorous methodological
approach, contrasting these responses during exercise to exhaustion and
during identical work before and after training. Seven untrained men
undertook 7 wk of sprint training. Subjects cycled to exhaustion at
130% pretraining peak oxygen uptake before (PreExh) and after training
(PostExh), as well as performing another posttraining test identical to
PreExh (PostMatch). Biopsies were taken at rest and immediately
postexercise. After training in PostMatch, muscle and plasma lactate
(Lac ) and H + concentrations, anaerobic ATP
production rate, glycogen and ATP degradation, IMP accumulation, and
peak plasma K + and norepinephrine concentrations were
reduced ( P < 0.05). In PostExh, time to exhaustion was
21% greater than PreExh ( P < 0.001); however, muscle
Lac accumulation was unchanged; muscle H +
concentration, ATP degradation, IMP accumulation, and anaerobic ATP
production rate were reduced; and plasma Lac ,
norepinephrine, and H + concentrations were higher
( P < 0.05). Sprint training resulted in reduced
anaerobic ATP generation during intense exercise, suggesting that
aerobic metabolism was enhanced, which may allow increased time to fatigue.
anaerobic ATP production; lactate; oxidative metabolism; hydrogen
ion; potassium
Deceased 7 February 1996.