Metacarpal bone mass and upper-extremity strength in 18-year-old boys.
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.
D000293:Adolescent; D000886:Anthropometry; D001132:Arm / Q000502:physiology*; D001835:Body Weight; D006801:Humans; D008297:Male; D008663:Metacarpus / Q000032:analysis* / Q000000981:diagnostic imaging; D009132:Muscles / Q000502:physiology*; D010809:Physical Fitness; D011859:Radiography