The relationship between grip strength and radius bone mineral density in postmenopausal women

ABSTRACT

BACKGROUND: Several studies have reported that muscle strength and bone mineral density have a significant positive correlation and most previous literature on muscle strength and bone mineral density examined their association. To evaluate the association between grip strength and radius bone mineral density, more precise PQCT was used rather than SPA or DEXA. METHODS: The study was performed from June to August 1999 in Pundang community with 154 postmenopausal women who undertaken osteoporosis screening program who participated in this study. Bone mineral density was measured at the radius using PQCT (peripheral quantitive computed tomograpy). Grip and pinch strength were measured in both the dominant and nondominant hands using a dyanometer. Other data were obtained from the questionnaire. RESULTS: Grip and pinch strength of the dominant hands were significantly higher than the nondominant hands. There was no significant difference in bone mineral density by exercise and fracture history. Age-adjusted partial correlation analysis indicated a significant positive correlation of radius BMD with dominant hands grip strength. Significant positive correlations also were found between radius BMD and pinch strength. CONCLUSION: Subjects with stronger grip strength had a low BMD. There was a significant positive correlationship between bone mineral density and dominant hand grip strength. especially with the more positive association of cortical BMD with forearm circumference. The data suggest that grip strength is a weak predictor of radius bone mineral density and provide a feasible way of predicting it.