Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
Oxford NIHR Musculoskeletal Biomedical Research Unit, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
Osteoporos Int. 2017 Sep;28(9):2675-2682. doi: 10.1007/s00198-017-4086-0. Epub 2017 Jun 13.
The primary objective is the description of bone mineral density (BMD) and body composition in newly licensed jockeys. One in three male, flat jockeys has a very low bone mineral density. Further research is needed to assess the short-term risk of fractures and long-term health implications of these findings.
Describe bone mineral density (BMD) and body composition in entry-level male and female, flat and jump jockeys in Great Britain.
Data was collected on jockeys applying for a professional jockey license between 2013 and 2015. Areal BMD at the spine, femoral neck (FN), total hip and body composition were assessed by dual-energy X-ray absorptiometry (DXA) scan. We examined differences between BMD and body composition by gender and race type (flat or jump). Volumetric bone mineral apparent density (BMAD) of the spine and FN was also calculated to account for group differences in bone size.
Seventy-nine male flat jockeys (age 18.5 ± 1.9, BMI 19.0 ± 1.4), 69 male jump (age 20.7 ± 2.0, BMI 20.6 ± 1.3) and 37 female flat jockeys (age 19.3 ± 2.0, BMI 20.8 ± 1.7) took part in this study. Spine BMD Z-scores ≤-2 for male flat, male jump and female flat jockeys were 29, 13 and 2.7%, respectively. Spine BMD was lower in male than female flat jockeys (p<0.001). All BMD scores were lower in male flat compared to male jump jockeys (p<0.001). Body fat percent (BF %) was lower in male flat jockeys compared to male jump and female flat jockeys (p<0.05). Lean mass index (LMI) was lower in male flat compared to male jump jockeys (p<0.001).
Male flat jockeys had a significantly lower BMD, LMI and BF% compared to jump jockeys and female flat jockeys. Male flat jockeys had lower spine BMD scores than females. Individual bone maturation may influence these findings. Further investigation into the relevance of low BMD and altered body composition on jockey health is required.
描述新获得执照的骑师的骨密度（BMD）和身体成分。三分之一的男性平地骑师骨密度极低。需要进一步研究以评估这些发现对骨折的短期风险和长期健康影响。
描述英国入职的男性和女性、平地和跳马骑师的骨密度（BMD）和身体成分。
收集了 2013 年至 2015 年期间申请职业骑师执照的骑师的数据。通过双能 X 射线吸收法（DXA）扫描评估脊柱、股骨颈（FN）、全髋关节和身体成分的面积 BMD。我们通过性别和种族类型（平地或跳马）检查了 BMD 和身体成分之间的差异。还计算了脊柱和 FN 的体积骨矿物质表观密度（BMAD），以解释骨大小的组间差异。
79 名男性平地骑师（年龄 18.5±1.9，BMI 19.0±1.4）、69 名男性跳马骑师（年龄 20.7±2.0，BMI 20.6±1.3）和 37 名女性平地骑师（年龄 19.3±2.0，BMI 20.8±1.7）参加了这项研究。男性平地、男性跳马和女性平地骑师的脊柱 BMD Z 分数≤-2 的比例分别为 29%、13%和 2.7%。男性平地骑师的脊柱 BMD 低于女性平地骑师（p<0.001）。与男性平地骑师相比，所有 BMD 评分均较低（p<0.001）。与男性平地和女性平地骑师相比，男性平地骑师的体脂百分比（BF%）较低（p<0.05）。与男性跳马骑师相比，男性平地骑师的瘦体重指数（LMI）较低（p<0.001）。
与跳马骑师和女性平地骑师相比，男性平地骑师的 BMD、LMI 和 BF%明显较低。男性平地骑师的脊柱 BMD 评分低于女性。个体骨骼成熟度可能会影响这些发现。需要进一步研究低 BMD 和身体成分改变对骑师健康的相关性。
