期刊
FRONTIERS IN PHYSIOLOGY
卷 2, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fphys.2011.00075
关键词
glucose uptake; muscle activation; knee-extensors; EMG; PET
类别
资金
- Academy of Finland [206970, 204240]
- Ministry of Education in Finland [143/722/2002, 51/722/2003, 40/627/2005]
- Julio Vainio Foundation (Finland)
- Danish National Research Foundation (Denmark)
- Danish Medical Research Council
- Lundbeck Foundation (Denmark)
- Novo-Nordisk Foundation
- Nordea Foundation and Fonds de la recherche en Sante Quebec
- Natural Science and Engineering Research Council of Canada
One-legged dynamic knee-extension exercise (DKE) is a widely used model to study the local cardiovascular and metabolic responses to exercise of the quadriceps muscles. In this study, we explored the extent to which different muscles of the quadriceps are activated during exercise using positron emission tomography (PET) determined uptake of [F-18]-fluoro-deoxy-glucose (GU) during DKE. Five healthy male subjects performed DKE at 25W for 35 min and both the contracting and contralateral resting leg were scanned with PET from mid-thigh and distally. On average, exercise GU was the highest in the vastus intermedius (VI) and lowest in the vastus lateralis (VL; VI vs VL, p < 0.05), whereas the coefficient of variation was highest in VL (VL vs VI, p < 0.05). Coefficient of variation between the mean values of the four quadriceps femoris (OF) muscles in the exercising leg was 35 +/- 9%. Compared to mean GU in OF (=100%), GU was on average 73% in VL, 84% in rectus femoris, 115% in vastus medialis, and 142% in VI. Variable activation of hamstring muscles and muscles of the lower leg was also observed. These results show that GU of different muscles of quadriceps muscle group as well as between individuals vary greatly during DKE, and suggests that muscle activity is not equal between quadriceps muscles in this exercise model. Furthermore, posterior thigh muscles and lower leg muscles are more active than hitherto thought even during this moderate exercise intensity.
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