Electronic Resource
Springer
European journal of applied physiology
58 (1988), S. 225-227
ISSN:
1439-6327
Keywords:
Glycogen degradation
;
Low contraction force
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary The glycogen content was measured in biopsy samples of human vastus lateralis muscle during prolonged isometric contraction with low force generation. In the first experiment 15% of the maximum voluntary contraction force (MVC) was held for 10 min. Glycogen utilization was 68.1 mmol glucosyl units · kg−1 dry muscle (d.m.). The study was continued by intermittent contractions of 50 s duration and 10 s rest repeated for 50 min. This resulted in a total glycogen utilization of 167.5 mmol glucosyl units · kg−1 d.m. The study was repeated with a force set to 7.5% MVC starting with 20 min continuous contraction followed by the same intermittent contractions for a further 100 min. The glycogen decrease was 15 mmol after the continuous contraction and totally 50 mmol after 2 h with the lower force. Thus the glycogen degradation rate even at low contraction force was related to the force level, being 6 times higher when the force was increased from 7.5 to 15% MVC. With prolonged isometric work periods at work loads corresponding to 15% MVC or higher depletion of the glycogen store can limit work performance capacity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00417253
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