Lean Body Mass and Bone Health in Urban Adolescents From Northern India.
OBJECTIVE
To prepare percentile charts of lean body mass (LBM) among Indian urban children and adolescents; and to evaluate gender differences in LBM, and its relation with pubertal status.


METHODS
Secondary data analysis.


METHODS
School in city of Delhi, India.


METHODS
1403 apparently healthy children and adolescents (826 boys) with mean (SD) age 13.2 (2.7) years.


METHODS
Lean body mass assessed by dual energy absorptiometry.


RESULTS
Total and regional lean mass were greater in older age groups in both sexes. LBM showed rising trends up to the age of 18 years in boys, whereas it plateaued after the age of 15 years in girls. The age-associated increase in LBM was significantly higher in boys (130%) compared to girls (83%) (P<0.001). Total and regional lean mass increased with progression of pubertal staging in both genders. During pubertal development, LBM almost doubled (100% increase) from stage-2 to stage-5 in boys, as opposed to a 73% rise in girls (P<0.001). Total and regional lean mass and Appendicular skeletal muscle mass index (ASMI) was positively correlated with age, body mass index (BMI), serum 25(OH)D, total fat mass, and bone mineral content (BMC). Relation between LBM and BMC remained significant even after adjusting for age, fat mass and various biochemical parameters.


CONCLUSIONS
Total and regional LBM rise with age and pubertal maturation in both genders, but more so in boys when compared to girls. LBM has direct bearing on BMC even after adjusting for age, fat mass and biochemical parameters.
Army Hospital (Research and Referral) Delhi Cantt, New Delhi; India, $Department of Endocrinology and Thyroid Research Centre, Institute of Nuclear Medicine and Allied Sciences, Delhi; ‡Biochemistry Division Department of Pathology, Deenanath Mangeshkar Hospital and Research Center, Pune; ** Division of Endocrinology and Diabetes, Medanta, The Medicity, Gurgaon; and ##Department of Endocrinology and Metabolism, AIIMS, New Delhi, India. Correspondence to: Maj Gen (retd) Dr RK Marwaha, Flat No 17, Gautam Apartments, Gautam Nagar, New Delhi 110 049, marwaha_ramank@hotmail.com.
Raman K
RK
Marwaha
M K
MK
Garg
Kuntal
K
Bhadra
Namita
N
Mahalle
Ambrish
A
Mithal
Nikhil
N
Tandon
D000293:Adolescent; D001823:Body Composition / Q000502:physiology*; D015519:Bone Density / Q000502:physiology*; D002648:Child; D015331:Cohort Studies; D005260:Female; D006801:Humans; D007194:India / Q000453:epidemiology; D008297:Male; D014505:Urban Population / Q000706:statistics & numerical data*