Overall , intervention groups obtained higher 25(OH)D concentration than controls and there was obvious dose – response effect between intake dose and 25(OH)D concentration .
Baseline 25(OH)D concentration and age were significant indicators for 25(OH)D concentration .
Conclusions Regional- and age-specific recommended dosages of VitD supplements for population to achieve optimal 25(OH)D concentrations have been suggested
Background / Objectives Optimal doses of vitamin D ( VitD ) supplement in different population s are unclear .
We aim to evaluate the relationship between VitD supplementation and post-intervention serum 25-hydroxyvitamin D [ 25(OH)D ] concentration , to provide a recommended dosage of VitD for achieving an optimal 25(OH)D concentration for different population s .
The effect of calcium and vitamin D supplementation on bone health of male Jockeys.
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 D supplementation would improve bone turnover markers ( BTM ) and non-weight bearing bone properties of young male jockeys . DESIGN A six-month r and omised , double-blinded , placebo-controlled trial with two groups of apprentice male jockeys was conducted . METHODS Participants ( age 20.18±3.23years ) were supplemented with 800 mg of calcium and 400IU 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
Overall , intervention groups obtained higher 25(OH)D concentration than controls and there was obvious dose – response effect between intake dose and 25(OH)D concentration .
Baseline 25(OH)D concentration and age were significant indicators for 25(OH)D concentration .
Conclusions Regional- and age-specific recommended dosages of VitD supplements for population to achieve optimal 25(OH)D concentrations have been suggested
Background / Objectives Optimal doses of vitamin D ( VitD ) supplement in different population s are unclear .
We aim to evaluate the relationship between VitD supplementation and post-intervention serum 25-hydroxyvitamin D [ 25(OH)D ] concentration , to provide a recommended dosage of VitD for achieving an optimal 25(OH)D concentration for different population s .