title: Bone formation is increased to a greater extent than bone resorption during a cycling stage race.
abstract: This study examined the effects of participation in the Tour of Southland, a 6-day bicycle race, on serum markers of bone turnover in 5 elite male cyclists. During the race, energy intake matched expenditure. Osteocalcin was increased approximately 300% on days 1-5; and C-terminal telopeptide of type I collagen was elevated (43%) on day 3. Participation in a cycling stage race does not appear to have deleterious effects on bone turnover.
authors.affiliation: Department of Nutritional Sciences, University of Missouri, Columbia, MO 65211, USA. hintonp@missori.edu
authors.forename: Pamela S
authors.initials: PS
authors.lastname: Hinton
authors.forename: Anna
authors.initials: A
authors.lastname: Rolleston
authors.forename: Nancy J
authors.initials: NJ
authors.lastname: Rehrer
authors.forename: Ien J
authors.initials: IJ
authors.lastname: Hellemans
authors.forename: Benjamin F
authors.initials: BF
authors.lastname: Miller
mesh_terms: D000293:Adolescent; D000469:Alkaline Phosphatase / Q000097:blood; D001642:Bicycling; D015415:Biomarkers / Q000097:blood; D001862:Bone Resorption / Q000097:blood / Q000209:etiology* / Q000503:physiopathology; D024042:Collagen Type I / Q000097:blood; D002149:Energy Intake; D004734:Energy Metabolism; D006706:Homeostasis; D006801:Humans; D008297:Male; D009520:New Zealand; D015675:Osteocalcin / Q000097:blood; D010012:Osteogenesis; D010455:Peptides / Q000097:blood; D010807:Physical Endurance; D013997:Time Factors; D055815:Young Adult
chemical_list: D015415:Biomarkers; D024042:Collagen Type I; D010455:Peptides; C052929:collagen type I trimeric cross-linked peptide; D015675:Osteocalcin; D000469:Alkaline Phosphatase