title: Effects of low intensity aerobic training on skeletal muscle capillary and blood lipoprotein profiles.
abstract: The effects of low intensity endurance training on skeletal muscle capillary density and serum lipoprotein levels were studied in 11 non-obese men (18-25 years). The subjects performed a 6-week training regimen (60 min, 5 times per week) at the lactate threshold (LT). Capillary density was determined in biopsy specimens obtained from the vastus lateralis muscle before and after the training. The number of capillaries per fiber (cap/fiber ratio) before training was 1.97 +/- 0.47, and increased to 2.49 +/- 0.69 after training (p < 0.05). The maximal oxygen uptake (VO2 max) and LT- VO2 increased significantly by 5% (p < 0.01) and 27% (p < 0.01), respectively, whereas no change was observed in body weight. Low density lipoprotein cholesterol (LDL-C) tended to decrease (p = 0.06). The change in the cap/fiber ratio correlated inversely with the change in the ratio of LDL-C to high density lipoprotein cholesterol (HDL-C) (r = -0.61, p < 0.05). It was also, positively associated with the change in HDL2-C (r = 0.82, p < 0.01) and inversely associated with the change in HDL3-C (r = -0.63, p < 0.05). The change in LT- VO2 was inversely associated with the change in LDL-C (r = -0.62, r < 0.05). These results indicate that low intensity training increases capillary density in skeletal muscle, which may explain in part the changes in the lipoprotein profiles.
authors.affiliation: Department of Community Health Science, Saga Medical School, Japan. naoko@post.saga-med.ac.jp
authors.forename: Naoko
authors.initials: N
authors.lastname: Shono
authors.forename: Hidenori
authors.initials: H
authors.lastname: Urata
authors.forename: Bengt
authors.initials: B
authors.lastname: Saltin
authors.forename: Masao
authors.initials: M
authors.lastname: Mizuno
authors.forename: Taeko
authors.initials: T
authors.lastname: Harada
authors.forename: Munehiro
authors.initials: M
authors.lastname: Shindo
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Tanaka
mesh_terms: D000293:Adolescent; D000328:Adult; D008076:Cholesterol, HDL / Q000097:blood*; D008078:Cholesterol, LDL / Q000097:blood*; D015444:Exercise / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D008833:Microcirculation / Q000502:physiology; D018656:Muscle Fibers, Fast-Twitch / Q000166:cytology; D018657:Muscle Fibers, Slow-Twitch / Q000166:cytology; D018482:Muscle, Skeletal / Q000098:blood supply* / Q000166:cytology / Q000502:physiology; D010809:Physical Fitness / Q000502:physiology
chemical_list: D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D019344:Lactic Acid