title: Leg blood flow during exercise in man in relation to muscle fibre composition.
abstract: Fibre composition in the vastus lateralis muscle, leg blood flow, oxygen uptake and respiratory exchange ratio were determined in 12 healthy male volunteers during submaximal exercise (50% of V02 max). The percentage of slow-twitch fibres varied from 26 to 66. Mean leg blood flow during exercise was 4.68 +/- 0.191.min-1. The blood flow and respiratory exchange ratio correlated positively to the percentage of slow-twitch fibres in the vastus muscles. No correlation was found between the muscle fibre composition and either oxygen uptake heart rate or mechanical efficiency. The results with a dependence of muscle blood flow and carbon dioxide release to muscle fibre composition support the view that the arrangement of the vascular bed and blood supply differ between fast-twitch and slow-twitch muscle fibres in humans.
mesh_terms: D000293:Adolescent; D000328:Adult; D006801:Humans; D007866:Leg / Q000098:blood supply*; D008297:Male; D009132:Muscles / Q000033:anatomy & histology*; D010101:Oxygen Consumption; D005082:Physical Exertion; D012119:Respiration