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1 Copenhagen Muscle Research Centre, Copenhagen, Denmark; Department of Infectious Diseases, Rigshospitalet, Copenhagen Muscle Research Centre, Copenhagen, Denmark
2 Copenhagen Muscle Research Centre, Copenhagen, Denmark; University of Copenhagen, August Kroch Institute, Copenhagen, Denmark; University of Copenhagen, August Kroch Institute, Copenhagen, Denmark
* To whom correspondence should be addressed. E-mail: bkp{at}rh.dk.
Angiogenesis, the growth of new blood vessels from existing ones, occurs in skeletal muscle as an adaptive response to exercise that satisfies the increased requirement of this tissue for oxygen delivery and metabolic processes. Of the factors that have been identified to regulate this process, the endothelial cell mitogen vascular endothelial growth factor (VEGF) has been proposed to play a key role. The aim of this study was to measure skeletal muscle VEGF mRNA content and arterial-venous (a-v) protein balance across the working leg in response to a single bout of prolonged, submaximal exercise. Seven physically active males completed 3 h of two-legged kicking ergometry. Muscle biopsies were collected from the vastus lateralis muscle from both working legs, and blood samples were collected from one femoral artery and femoral vein before, during, and in recovery from exercise. We show that the exercise stimulus elicited a decrease in VEGF protein arterial-venous (a-v) balance across the exercising leg (p=0.007), and anine fold elevation in skeletal muscle VEGF mRNA expression (p<0.001). The changes in VEGF protein balance and mRNA content were most pronounced 1 h after the cessation of exercise. In conclusion, these findings demonstrate that sub-maximal exercise, suitable for humans with low CV fitness, induces a decrease in VEGF a-v balance that is likely to be of clinical significance in promoting angiogenic effects.
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