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Bone mass of asian adolescents in China: influence of physical activity and smoking.
Med Sci Sports Exerc. 2003 May; 35(5):720-9.MS

Abstract

INTRODUCTION/PURPOSE

Research addressing the role of biology and behavior on bone development during times of peak bone acquisition in adolescence is limited. The present investigation was conducted to address the influence of body composition (lean body mass, fat mass), menarche, leisure physical activity, sports team participation, smoking, and second-hand smoke on skeletal mass of a unique sample of Asian adolescents in China.

METHODS

A total of 166 girls and 300 boys (ages 12-16 yr) participated in this study. Bone mineral density (BMD) and content (bone mineral content (BMC)) of the forearm and the os calcis were measured using dual energy x-ray absorptiometry (DXA); lean body mass (LBM) and fat mass were estimated by bioelectrical impedance analysis (BIA); grip strength was measured by isometric dynamometry. Menarche, leisure physical activity, sports team participation, and active and passive smoking were determined using questionnaire.

RESULTS

In girls, a total of 44% of the variance in forearm BMC was attributed to a model which included LBM (32%), time since menarche (10%), and age (2%); heel BMC was best predicted by LBM alone (42%), with no significant contribution by other variables. In boys, a total of 39% of the variance in forearm BMC was attributed to a model which included LBM (28%), age (5%), sports team participation (4%), height (1%), and fat mass (1%); heel BMC was best predicted by LBM (50%) and height (3%), accounting for 53% of the variance.

CONCLUSION

The findings of this study suggest that lean body mass is the primary determinant of bone mass in Chinese adolescents. Menarche is also an important contributor in girls, whereas age and sports team participation are secondary predictors of bone mass in boys.

Authors+Show Affiliations

Institute for Prevention Research, Department of Preventive Medicine, Keck School of Medicine, Los Angeles, CA, USA. aafghani@tourou.eduNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

12750579

Citation

Afghani, Afrooz, et al. "Bone Mass of Asian Adolescents in China: Influence of Physical Activity and Smoking." Medicine and Science in Sports and Exercise, vol. 35, no. 5, 2003, pp. 720-9.
Afghani A, Xie B, Wiswell RA, et al. Bone mass of asian adolescents in China: influence of physical activity and smoking. Med Sci Sports Exerc. 2003;35(5):720-9.
Afghani, A., Xie, B., Wiswell, R. A., Gong, J., Li, Y., & Anderson Johnson, C. (2003). Bone mass of asian adolescents in China: influence of physical activity and smoking. Medicine and Science in Sports and Exercise, 35(5), 720-9.
Afghani A, et al. Bone Mass of Asian Adolescents in China: Influence of Physical Activity and Smoking. Med Sci Sports Exerc. 2003;35(5):720-9. PubMed PMID: 12750579.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Bone mass of asian adolescents in China: influence of physical activity and smoking. AU - Afghani,Afrooz, AU - Xie,Bin, AU - Wiswell,Robert A, AU - Gong,Jie, AU - Li,Yan, AU - Anderson Johnson,C, PY - 2003/5/17/pubmed PY - 2003/8/15/medline PY - 2003/5/17/entrez SP - 720 EP - 9 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 35 IS - 5 N2 - INTRODUCTION/PURPOSE: Research addressing the role of biology and behavior on bone development during times of peak bone acquisition in adolescence is limited. The present investigation was conducted to address the influence of body composition (lean body mass, fat mass), menarche, leisure physical activity, sports team participation, smoking, and second-hand smoke on skeletal mass of a unique sample of Asian adolescents in China. METHODS: A total of 166 girls and 300 boys (ages 12-16 yr) participated in this study. Bone mineral density (BMD) and content (bone mineral content (BMC)) of the forearm and the os calcis were measured using dual energy x-ray absorptiometry (DXA); lean body mass (LBM) and fat mass were estimated by bioelectrical impedance analysis (BIA); grip strength was measured by isometric dynamometry. Menarche, leisure physical activity, sports team participation, and active and passive smoking were determined using questionnaire. RESULTS: In girls, a total of 44% of the variance in forearm BMC was attributed to a model which included LBM (32%), time since menarche (10%), and age (2%); heel BMC was best predicted by LBM alone (42%), with no significant contribution by other variables. In boys, a total of 39% of the variance in forearm BMC was attributed to a model which included LBM (28%), age (5%), sports team participation (4%), height (1%), and fat mass (1%); heel BMC was best predicted by LBM (50%) and height (3%), accounting for 53% of the variance. CONCLUSION: The findings of this study suggest that lean body mass is the primary determinant of bone mass in Chinese adolescents. Menarche is also an important contributor in girls, whereas age and sports team participation are secondary predictors of bone mass in boys. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/12750579/Bone_mass_of_asian_adolescents_in_China:_influence_of_physical_activity_and_smoking_ L2 - http://dx.doi.org/10.1249/01.MSS.0000064940.76574.BD DB - PRIME DP - Unbound Medicine ER -