Determinants of axial and peripheral bone mass in Chinese adolescents
a Department of
Orthopaedics and Traumatology, Chinese University of Hong Kong, Prince
of Wales Hospital, Hong Kong, b Department of Paediatrics, Chinese University
of Hong Kong, c Centre for Clinical Trials
and Epidemiological Research, Chinese University of Hong Kong, d Department of
Orthopaedic Surgery, University of Aberdeen Medical School, Polwarth
Building, Foresterhill, Aberdeen AB25 2ZD, UK
Correspondence to: Dr Maffulli.
Accepted 24 December 1997
OBJECTIVE
To determine the relation of puberty,
physical activity, physical fitness, and calcium intake with bone
mineral content (BMC) of the distal radius, and on bone mineral density
(BMD) of the L2 to L4 vertebrae in a group of healthy Chinese adolescents.
DESIGNCross sectional survey.
SUBJECTSA group of 179 healthy Chinese
adolescents (92 boys and 87 girls) aged 12 to 13 years enrolled in the
first year of the Tii Junior High School in Shatin, Hong Kong. Ninety
four of the pupils enrolled were in the physical education major class
(PE), and the other 85 were in the art major class (ARTS).
MAIN OUTCOME MEASURESCorrelation of BMC of the
distal radius and BMD of the L2 to L4 vertebrae with level of physical
activity, physical fitness (isometric and isokinetic), muscle strength
of the upper and lower limb, and calcium intake.
RESULTSBMC of the distal radius and BMD of the L2
to L4 vertebrae were significantly positively correlated. Univariate
and regression analysis showed that age, pubertal staging, physical
fitness, and muscle strength were significantly associated with bone
mass in a positive way. Calcium intake and type of sport practised did
not exert a significant influence on BMC of the distal radius and BMD
of the L2 to L4 vertebrae in boys. The results for the BMD of the L2 to
L4 vertebrae were similar in girls and boys; however, in girls, the BMC
of the distal radius had a negative correlation with calcium intake.
Physical fitness was a significant positive predictor of BMD of the L2
to L4 vertebrae.
CONCLUSIONSAmong Chinese adolescents bone mass
was positively influenced by certain measures of physical fitness as
well as by age, weight, and pubertal stage.
© 1998 by Archives of Disease in Childhood
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