Abstract
The purpose of this study was to evaluate the relationship between isometric quadriceps muscle strength and measurements of bone density (BMD), mass (BMC) and ultrasound properties. A total of 113 individuals were included, 53 men and 60 women aged 22-85 years. Isometric quadriceps muscle strength correlated significantly to BMD of the total body for both men (r=0.63, p=0.02) and women r=0.77, p=0.04) after adjustments for age, weight and height. In women, there was also an association between isometric quadriceps muscle strength and BMD of the lumbar spine (r=0.67, p=0.04). These correlations were evident in premenopausal women for BMD at the lumbar spine, femoral neck and total body whereas no significant relationships were seen in postmenopausal women or any age group of men. For isometric quadriceps muscle strength and the ultrasound measurements of the heel, a positive correlation was seen in men and women aged 41-60 years. The findings point to a role of endogenous sex steroids, primarily estrogens, in the correlation between BMD and isometric quadriceps muscle strength.
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