title: Serum osteocalcin (BGP) levels in normal men: a longitudinal evaluation reveals an age-associated increase.
abstract: Serum levels of bone gla protein (BGP) have been reported to increase with aging and hence to reflect an age-related increase in bone remodeling activity. To evaluate the relationship between aging and serum BGP levels in a study of longitudinal design, we measured BGP concentrations in 77 normal men at 6 month intervals over a 3 year period. Mean BGP levels at the onset (4.95 +/- 1.5 ng/ml) increased significantly during the study (p = 0.004), and the mean of individual BGP slopes was positive (0.38 +/- 0.6 ng/ml per year, p = 0.0001). The rate of change in BGP was not related to serum creatinine levels or dietary calcium intake.
authors.affiliation: Medical Service, Portland VA Medical Center, OR.
authors.forename: E S
authors.initials: ES
authors.lastname: Orwoll
authors.forename: L J
authors.initials: LJ
authors.lastname: Deftos
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000097:blood*; D003404:Creatinine / Q000097:blood; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D015675:Osteocalcin / Q000097:blood*; D012016:Reference Values
chemical_list: D015675:Osteocalcin; D003404:Creatinine