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J Appl Physiol (February 8, 2002). doi:10.1152/japplphysiol.01066.2001
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Articles in PresS, published online ahead of print February 8, 2002
J Appl Physiol, 10.1152/jap.01066.2001
Submitted on October 23, 2001
Accepted on January 24, 2002

Prepubertal Asians Have Less Limb Skeletal Muscle

Mi-Yeon Song1, Jaehee Kim2, Mary Horlick3, Jack Wang4, Richard N Pierson4, Moonseong Heo4, and Dympna Gallagher1*

1 Obesity Research Center, Department of Medicine, St. Luke's-Roosevelt Hospital, New York, New York, USA; Institute of Human Nutrition, Teacher's College, New York, New York, USA
2 Obesity Research Center, Department of Medicine, St. Luke's-Roosevelt Hospital, New York, New York, USA; Department of Biobehavioral Studies, Teacher's College, New York, New York, USA
3 Obesity Research Center, Department of Medicine, St. Luke's-Roosevelt Hospital, New York, New York, USA; Childrens Hospital, Columbia University, College of Physicians & Surgeons, New York, New York, USA
4 Obesity Research Center, Department of Medicine, St. Luke's-Roosevelt Hospital, New York, New York, USA

* To whom correspondence should be addressed. E-mail: DG108{at}Columbia.edu.

Skeletal muscle mass in prepubertal Asian children has not been examined previously. The aims of this study were to test the hypotheses that: 1) prepubertal Asians have lower appendicular skeletal muscle mass (ASM) compared to African-Americans and Caucasians, and 2) ASM is lower in prepubertal Asian females compared to Asian males. ASM was estimated using dual energy x-ray absorptiometry in healthy prepubertal females (n = 170) and males (n = 166). The results showed that after adjusting for age, height, and body weight: 1) Asian females and males had lower amounts of ASM than African-Americans (P < 0.001); 2) Asian females had lower amounts of ASM than Caucasian females (P = 0.004); 3) there was a trend towards lower ASM in Asian compared to Caucasian males (P = 0.07); 4) and Asian females had significantly lower ASM than Asian males (P < 0.001). This study, indicates that skeletal muscle mass as a fraction of body weight is smaller in Asian compared to African-American and Caucasian children.




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