NDLI: Are the effects of training on fat metabolism involved in the improvement of performance during high-intensity exercise?

Content Provider	Springer Nature Link
Author	Messonnier, Laurent Denis, Christian Prieur, Fabrice Lacour, Jean René
Copyright Year	2005
Abstract	The objective of the present study was to relate changes in certain muscle characteristics and indicators of metabolism in response to endurance training to the concomitant changes in time to exhaustion (Tlim) at a work rate corresponding to maximal oxygen uptake $$\left( {{\dot {\text{V}}O}_{{\text{2peak}}} } \right).$$ Eight healthy sedentary subjects pedalled on a cycle ergometer 2 h a day, 6 days a week, for 4 weeks. Training caused increases in $$\dot{\text{V}}$$ O2peak (by 8%), Tlim (from 299±23 s before to 486±63 s after training), citrate synthase and 3-hydroxyl-acyl-CoA dehydrogenase (HAD) activities (by 54% and 16%, respectively) and capillary density (by 31%). Decreases in activity of lactate dehydrogenase (LDH) and muscle type of LDH (by 24% and 28%, respectively) and the phosphofructokinase/citrate synthase ratio (by 37%) were also observed. Respiratory exchange ratio (RER) tended to be lower (P<0.1) at all relative work rates after training while the corresponding ventilation rates ( $$\dot{\text{V}}$$ E) were unchanged. At the same absolute work rate, RER and $$\dot{\text{V}}$$ E were lower after training (P<0.05). The improvement of Tlim with training was related to the increases in HAD activity (r=0.91, P=0.0043), and to the decreases in RER calculated for Papeak (r=0.71, P=0.0496). The present results suggest that the training-induced adaptations in fat metabolism might influence Tlim at a work rate corresponding to $$\dot{\text{V}}$$ O2peak and stimulate the still debated and incompletely understood role of fat metabolism during short high-intensity exercise
Starting Page	434
Ending Page	441
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	94
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-04-21
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fat oxidation Respiratory exchange ratio Time to exhaustion Performance
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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