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Capillary supply of the quadriceps femoris muscle of man: adaptive response to exercise
Author(s) -
Andersen Per,
Henriksson Jan
Publication year - 1977
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1977.sp011975
Subject(s) - quadriceps femoris muscle , skeletal muscle , capillary action , chemistry , cytochrome c oxidase , myofibril , endocrinology , anatomy , medicine , endurance training , biochemistry , mitochondrion , isometric exercise , materials science , composite material
1. Five subjects trained for 8 weeks on a bicycle ergometer for an average of 40 min/day, four times a week at a work load requiring 80% of the maximal oxygen uptake ( V̇ O 2 max. ). V̇ O 2 max. determinations were performed, and muscle biopsies from the quadriceps femoris muscle (vastus lateralis) were taken before, as well as repeatedly during, the training period. The muscle biopsies were histochemically stained for fibre‐types (myofibrillar ATPase) and capillaries (amylase‐PAS method), and analysed biochemically for succinate dehydrogenase and cytochrome oxidase activities. 2. The training programme resulted in a 16% increase in V̇ O 2 max. , a 20% increase in capillary density, a 20% increase in mean fibre area, and an approximately 40% increase in the activities of succinate dehydrogenase and cytochrome oxidase. 3. The capillary supply to type I, IIA and IIB fibres, expressed as the mean number of capillaries in contact with each fibre‐type, relative to fibre‐type area, increased equally. 4. The present study shows that endurance training constitutes a powerful stimulus for capillary proliferation in human skeletal muscle.