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The effect of calcium and vitamin D supplementation on bone health of male Jockeys
Silk, Leslie N. Greene, David A. Baker, Michael K. Jander, Caron B.
Silk, Leslie N.
Greene, David A.
Baker, Michael K.
Jander, Caron B.
Abstract
Objectives: Engagement in high volumes of physical activity coupled with energy restriction during periods of musculoskeletal development may compromise bone health. Jockeys limit caloric intakes on a weekly basis often from their mid-to-late teens. The aim of this study was to establish whether calcium and vitamin Dsupplementation would improve bone turnover markers (BTM) and non-weight bearing bone properties of young male jockeys. Design: A six-month randomised, double-blinded, placebo-controlled trial with two groups of apprentice male jockeys was conducted. Methods: Participants (age 20.18 ± 3.23 years) were supplemented with 800 mg of calcium and 400 IU of vitamin D (n = 8) or a placebo (n = 9) daily. Bone properties were assessed at the ultra-distal (4%) and proximal (66%) radius using pQCT at baseline and six months. Vitamin D, P1NP and CTX were assessed. Results: ANCOVA results for blood-borne markers indicated higher vitamin D levels (18.1%, p = 0.014, partial η2 = 0.38) and lower CTX (ng·L−1) (−24.8%, p = 0.011, partial η2 = 0.40) in the supplemented group with no differences observed in P1NP. Analysis of bone variables indicated no between group differences in either trabecular or cortical bone properties at the 4% and 66% sites post-intervention. Conclusions: This trial is the first to examine the efficacy of calcium and vitamin D supplementation in improving non-weight bearing bone properties in a young male athletic population. Results indicate positive alterations to bone metabolism; however, longer duration or higher dosage appears to be required to detect changes in bone material properties at the radius. Further examination of such interventions in weight-restricted athletes is warranted.
Keywords
peripheral quantitative computed tomography (pQCT), radius, weight-restricted, bone turnover markers
Date
2017
Type
Journal article
Journal
Journal of Science and Medicine in Sport
Book
Volume
20
Issue
3
Page Range
225-229
Article Number
ACU Department
School of Behavioural and Health Sciences
Faculty of Health Sciences
Research Office
Faculty of Health Sciences
Research Office
Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled