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[The differences in bone mineral content between female dancers and controls aged 15 - 17 years old and its relationship with physical activity level].
Zhonghua Yu Fang Yi Xue Za Zhi. 2009 Dec; 43(12):1077-80.ZY

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.

Authors+Show Affiliations

National Institute for Nutrition and Food Safety, Chinese Center for Disease Control and Prevention, Beijing 100050, China. lichen_yang@yahoo.com.cnNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
English Abstract
Journal Article
Research Support, Non-U.S. Gov't

Language

chi

PubMed ID

20193503

Citation

Yang, Li-chen, et al. "[The Differences in Bone Mineral Content Between Female Dancers and Controls Aged 15 - 17 Years Old and Its Relationship With Physical Activity Level]." Zhonghua Yu Fang Yi Xue Za Zhi [Chinese Journal of Preventive Medicine], vol. 43, no. 12, 2009, pp. 1077-80.
Yang LC, Hu J, Lan Y, et al. [The differences in bone mineral content between female dancers and controls aged 15 - 17 years old and its relationship with physical activity level]. Zhonghua Yu Fang Yi Xue Za Zhi. 2009;43(12):1077-80.
Yang, L. C., Hu, J., Lan, Y., Yang, Y. H., Zhang, Q., & Piao, J. H. (2009). [The differences in bone mineral content between female dancers and controls aged 15 - 17 years old and its relationship with physical activity level]. Zhonghua Yu Fang Yi Xue Za Zhi [Chinese Journal of Preventive Medicine], 43(12), 1077-80.
Yang LC, et al. [The Differences in Bone Mineral Content Between Female Dancers and Controls Aged 15 - 17 Years Old and Its Relationship With Physical Activity Level]. Zhonghua Yu Fang Yi Xue Za Zhi. 2009;43(12):1077-80. PubMed PMID: 20193503.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [The differences in bone mineral content between female dancers and controls aged 15 - 17 years old and its relationship with physical activity level]. AU - Yang,Li-chen, AU - Hu,Jing, AU - Lan,Yan, AU - Yang,Yan-hua, AU - Zhang,Qian, AU - Piao,Jian-hua, PY - 2010/3/3/entrez PY - 2010/3/3/pubmed PY - 2010/6/11/medline SP - 1077 EP - 80 JF - Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine] JO - Zhonghua Yu Fang Yi Xue Za Zhi VL - 43 IS - 12 N2 - 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. SN - 0253-9624 UR - https://www.unboundmedicine.com/medline/citation/20193503/[The_differences_in_bone_mineral_content_between_female_dancers_and_controls_aged_15___17_years_old_and_its_relationship_with_physical_activity_level]_ L2 - http://journal.yiigle.com/LinkIn.do?linkin_type=pubmed&amp;issn=0253-9624&amp;year=2009&amp;vol=43&amp;issue=12&amp;fpage=1077 DB - PRIME DP - Unbound Medicine ER -