在青春期，需要进行剧烈强度的体育活动来改善骨量吗？来自巴西出生队列的研究结果。
Is vigorous-intensity physical activity required for improving bone mass in adolescence? Findings from a Brazilian birth cohort.
机构信息
Post-Graduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil.
Department of Nutrition, Federal University of Pelotas, Pelotas, Brazil.
出版信息
Osteoporos Int. 2019 Jun;30(6):1307-1315. doi: 10.1007/s00198-019-04862-6. Epub 2019 Feb 22.
UNLABELLED
The association between moderate and vigorous physical activity throughout adolescence and areal bone density (aBMD) at 18 years of age was evaluated. Vigorous-intensity physical activity at 11, 15, and 18 years was associated with aBMD in early adulthood, especially in boys. Cross-sectional analyses showed a positive association between moderate physical activity and aBMD.
INTRODUCTION
To evaluate independent associations of moderate and vigorous physical activity (MPA, VPA) across adolescence with areal bone mineral density (aBMD).
METHODS
Physical activity (PA) was assessed at 11, 15, and 18 years of age by self-report and at 18 years by accelerometry in the 1993 Pelotas Birth Cohort Study. Time spent in MPA and VPA was determined using metabolic equivalents and specific cutoffs based on raw acceleration. Lumbar spine and femoral neck aBMD were measured by DXA at 18 years. Statistical analyses evaluated the association of MPA and VPA with aBMD, after adjusting for skin color, asset index, current height and age at menarche, and peak strain score (based on ground reaction forces of PA).
RESULTS
Lumbar spine and femoral neck aBMD were available for 3947 (49.9% of boys) and 3960 (49.6% of boys) individuals, respectively. Time spent in MPA at 11 and 15 years was not associated with aBMD. VPA at all time points was positively related to both lumbar spine and femoral neck aBMD in boys. Results were consistent for objectively measured VPA. Girls who achieved 75+ minutes/week of VPA in at least two follow-ups showed higher aBMD at 18 years of age. Boys who reached 75+ minutes/week of VPA at all follow-ups had on average 0.117 g/cm (95% CI: 0.090; 0.144) higher femoral neck aBMD than those who never achieved this threshold.
CONCLUSIONS
Self-reported VPA but not MPA throughout adolescence was associated with aBMD. Recommendation for PA in young people should consider the importance of VPA.
背景
评估了青少年时期适度和剧烈身体活动与 18 岁时骨密度（aBMD）之间的关系。11、15 和 18 岁时的高强度身体活动与成年早期的 aBMD 相关，尤其是男孩。横断面分析显示，中等强度身体活动与 aBMD 呈正相关。
目的
评估整个青春期中等强度和剧烈身体活动（MPA、VPA）与骨面积密度（aBMD）的独立关联。
方法
1993 年佩洛塔斯出生队列研究通过自我报告在 11、15 和 18 岁时评估身体活动（PA），并在 18 岁时通过加速度计进行评估。使用代谢当量和基于原始加速度的特定截止值确定 MPA 和 VPA 的时间。18 岁时通过 DXA 测量腰椎和股骨颈 aBMD。统计分析在调整肤色、资产指数、当前身高和初潮年龄以及峰值应变评分（基于 PA 的地面反作用力）后，评估了 MPA 和 VPA 与 aBMD 的关联。
结果
腰椎和股骨颈 aBMD 可用于 3947 名（男孩占 49.9%）和 3960 名（男孩占 49.6%）个体。11 岁和 15 岁时的 MPA 时间与 aBMD 无关。所有时间点的 VPA 与男孩的腰椎和股骨颈 aBMD 均呈正相关。客观测量的 VPA 结果一致。在至少两次随访中达到每周 75 分钟以上 VPA 的女孩，18 岁时的 aBMD 更高。在所有随访中达到每周 75 分钟以上 VPA 的男孩，股骨颈 aBMD 平均比从未达到这一阈值的男孩高 0.117g/cm（95%CI：0.090；0.144）。
结论
青少年时期自我报告的 VPA 而不是 MPA 与 aBMD 相关。建议年轻人进行 PA 应考虑 VPA 的重要性。
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