[15至17岁女性舞蹈演员与对照组骨矿物质含量的差异及其与身体活动水平的关系]

[The differences in bone mineral content between female dancers and controls aged 15 - 17 years old and its relationship with physical activity level].

作者信息

Yang Li-chen, Hu Jing, Lan Yan, Yang Yan-hua, Zhang Qian, Piao Jian-hua

机构信息

National Institute for Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China.

出版信息

Zhonghua Yu Fang Yi Xue Za Zhi. 2009 Dec;43(12):1077-80.

PMID:20193503

Abstract

OBJECTIVE

To assess bone mineral content (BMC) of 15 - 17 year-old dancers and high school females and analyze the relationship between physical activity status and BMC.

METHODS

Sixty dancers and 77 healthy controls aged 15 - 17 years old were enrolled in our study. BMC in the total body and forearm were measured by dual-energy X-ray absorptiometry (DEXA) while body weight and height were also measured. Physical activity information was collected by "one-year physical activity questionnaire".

RESULTS

The physical activity level (PAL) and the average daily energy expenditure (EE) of dancers were all higher than controls (PAL: 2.17 +/- 0.34 vs 1.63 +/- 0.34, t = 7.283; EE: (6876.43 +/- 1036.72) kJ vs (5388.43 +/- 920.83) kJ, t = 7.214, both P values < 0.01). The dancers showed lower BMC/height at total body and arms compared with the controls (the total body BMC/height was (13.896 +/- 1.308) vs (14.494 +/- 1.272) g/cm, F = -2.563); and the BMC/height of left and right arm were (0.779 +/- 0.088) vs (0.829 +/- 0.101) g/cm (F = -2.892) and (0.766 +/- 0.093) vs (0.829 +/- 0.097) g/cm (F = -3.650) respectively, all these P values were < 0.01.Yet after adjusting age and BMI, the dancers showed higher BMC/height at total body and legs, the corresponding values were (14.550 +/- 0.146) vs (13.947 +/- 0.131) g/cm (F = 7.868), (2.681 +/- 0.033) vs (2.389 +/- 0.030) g/cm (F = 36.520), (2.821 +/- 0.031) vs (2.450 +/- 0.028) g/cm (F = 65.279), all these P values were < 0.01. While no differences were found with controls at non-weight bearing sites (arms). Daily period (h) of training was significantly related to BMC/height of legs, total body (r value were 0.618, 0.448 and 0.554 respectively, all the P values < 0.01), while the history of training was also correlated with BMC/height of two legs (r value were 0.38 and 0.304 respectively, both P values < 0.05).

CONCLUSION

The adolescent dancers showed higher BMC after adjusting age and BMI, which was attributed to the long-term high level weight-bearing physical activity.

摘要

目的

评估15 - 17岁舞蹈演员和高中女生的骨矿物质含量（BMC），并分析身体活动状况与BMC之间的关系。

方法

本研究纳入了60名15 - 17岁的舞蹈演员和77名健康对照者。采用双能X线吸收法（DEXA）测量全身和前臂的BMC，同时测量体重和身高。通过“一年身体活动问卷”收集身体活动信息。

结果

舞蹈演员的身体活动水平（PAL）和平均每日能量消耗（EE）均高于对照组（PAL：2.17±0.34对1.63±0.34，t = 7.283；EE：（6876.43±1036.72）kJ对（5388.43±920.83）kJ，t = 7.214，P值均<0.01）。与对照组相比，舞蹈演员全身和手臂的BMC/身高较低（全身BMC/身高为（13.896±1.308）对（14.494±1.272）g/cm，F = -2.563）；左右手臂的BMC/身高分别为（0.779±0.088）对（0.829±0.101）g/cm（F = -2.892）和（0.766±0.093）对（0.829±0.097）g/cm（F = -3.650），所有这些P值均<0.01。然而，在调整年龄和BMI后，舞蹈演员全身和腿部的BMC/身高较高，相应值分别为（14.550±0.146）对（13.947±0.131）g/cm（F = 7.868），（2.681±0.033）对（2.389±0.030）g/cm（F = 36.520），（2.821±0.031）对（2.450±0.028）g/cm（F = 65.279），所有这些P值均<0.01。而在非承重部位（手臂）与对照组未发现差异。每日训练时长（小时）与腿部、全身的BMC/身高显著相关（r值分别为0.618、0.448和0.554，所有P值<0.01），而训练史也与双腿的BMC/身高相关（r值分别为0.38和0.304，P值均<0.05）。