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Ile purpose of this study »as to imcstigatc the relationship het « ecu biological age. habitual physical activity and aul liropomet I'ical and physiological charactei'isties in 12-and Ki-year-old schoolboys (n 7(1). Mi'1/iiiil.i. At the beginning and the end of the school year 1971/72 biological age «as determined by measuring skeletal age (Vom left hand N-ray photographs. Habitual physical activity «as determined by quest ionnaire interview and pedometers. lii'fuill«: All anthropométrie:!] characterist ies showed significant eorrelnt ions (/' (t.(C>) with sUeletal age except foi 1 bicipital and ti'icipital skiid'olds. Out of 9 physical fitness tests handgrip «as the only test that showed a significant correlation (O.f)2) with skeletal age. Pedometer scores gave signilicant negative correlations (/' (1.05) with antiiroponict ncal characteristics except for trieipitnl skinfold. The titncss tests bent arm hang. 12 min run walk, sit and reach and \V| 70 showed significant correlations (/' (1.1(5) with pedometer scores. K r I/ ironln: Skeletal age Habitual physical activity Ant hropomet rienl characteristics-Physical fitness characteristic*.

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