NDLI: Effect of training with different intensities and volumes on muscle fibre enzyme activity and cross sectional area in the m. triceps brachii

Content Provider	Springer Nature Link
Author	Gjøvaag, Terje F. Dahl, Hans A.
Copyright Year	2008
Abstract	This study primarily examined how intermittent versus continuous endurance training, using similar or dissimilar volumes, affected muscle fibre enzyme activities in the triceps brachii muscle. Thirty-two subjects performed either intermittent (60% of 1RM) or continuous (30% of 1RM) elbow extensions 3 times week−1 in a training apparatus. Training was performed until either a low (five) or a high volume (8 weeks) was accumulated. Muscle biopsies from the m. triceps brachii were taken pre- and post training and following 8 weeks of detraining. Marker enzymes for muscle fibre oxidative (succinate dehydrogenase SDH) and glycolytic (glycerophosphate dehydrogenase; α-GPDH) capacity was assessed by histochemistry, and the resulting enzyme activities measured by image analysis. The type of training affected enzyme activities differently. In type 1 fibres, continuous and intermittent training was equally effective in increasing SDH activity, while intermittent training increased SDH activity more than continuous training in type 2 fibres (P < 0.05). Intermittent training increased α-GPDH activity more than continuous training both in type 1 (P < 0.001) and type 2 fibres (P < 0.05), but the increase in glycolytic capacity following intermittent training was larger in type 1 (54%) than in type 2 fibres (23%). There was no effect of training volume on oxidative or glycolytic capacity in either fibre type. Thus, when training intensity is sufficient to stimulate to increases in oxidative and glycolytic capacity, the SDH and α-GPDH response seems to be volume independent. Detraining reduced Post-T enzyme activities to baseline (all; P < 0.01).
Starting Page	399
Ending Page	409
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	103
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-03-20
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Intermittent Continuous Oxidative Glycolytic Fcsa Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
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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