title: The Effect of Reduced Physical Activity and Retraining on Blood Lipids and Body Composition in Young and Older Adult Men.
abstract: We studied the effect of physical inactivity and subsequent retraining on cardiovascular risk factors in 17 young (Y; 23.4 ± 0.5 years) and 15 older adult (O; 68.1 ± 1.1 years) men who underwent 14 days of one leg immobilization followed by six weeks of training. Body weight remained unchanged. Daily physical activity decreased by 31 ± 9% (Y) and 37 ± 9% (O) (p < .001). Maximal oxygen uptake decreased with inactivity (Y) and always increased with training. Visceral fat mass decreased (p < .05) with training. Concentrations of lipids in blood were always highest in the older adults. FFA and glycerol increased with reduced activity (p < .05), but reverted with training. Training resulted in increases in HDL-C (p < .05) and a decrease in LDL-C and TC:HDL-C ratio (p < .05). A minor reduction in daily physical activity for two weeks increased blood lipids in both young and older men. Six weeks of training improved blood lipids along with loss of visceral fat.
authors.affiliation: Xlab, Center for Healthy Aging, Department of Biomedical Sciences, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
authors.forename: Jesper
authors.initials: J
authors.lastname: Nørregaard
authors.forename: Martin
authors.initials: M
authors.lastname: Gram
authors.forename: Andreas
authors.initials: A
authors.lastname: Vigelsø
authors.forename: Caroline
authors.initials: C
authors.lastname: Wiuff
authors.forename: Anja Birk
authors.initials: AB
authors.lastname: Kuhlman
authors.forename: Jørn Wulff
authors.initials: JW
authors.lastname: Helge
authors.forename: Flemming
authors.initials: F
authors.lastname: Dela
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D001823:Body Composition / Q000502:physiology*; D006801:Humans; D050152:Intra-Abdominal Fat / Q000502:physiology; D008055:Lipids / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology; D010806:Physical Education and Training; D012307:Risk Factors; D057185:Sedentary Behavior
chemical_list: D008055:Lipids