Metacarpal Bone Mass and Upper-Extremity Strength in 18-Year-Old Boys

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Abstract
The relation between bone mass and upper-extremity strength in 106 18-year-old boys was investigated. Bone mass was measured radiogrammetrically at the second metacarpal bone, and upper-extremity strength was measured by three power ability tests: vertical jump height, arm pull strength, and bent arm hang time. A significant correlation between arm pull strength and cortical thickness and cortical area was found. There was also a significant correlation between body weight, bone mass, and power tests. After partial correlation study, leaving out weight, a significant correlation between bone mass indices and arm pull strength remained. The larger bone mass in the above-average-fit boy is due to a larger periosteal diameter and smaller endosteal diameter. This study suggests that static strength is one of the determinants of bone gain before maturity.

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