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Muscle power, force associated with cortical bone strength

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BALTIMORE — Muscle power and force could contribute to cortical bone strength via distinct mechanisms, according to data presented by Sarah A. Hardcastle, MBChB, BSc, MRCP, clinical research fellow at the University of Bristol in the United Kingdom, here at ASBMR 2013.

The study included participants (n=189; 119 women) from three sites within the U.K.-based High Bone Mass study, in whom jumping mechanography was performed, according to Hardcastle. Peak ground reaction force and peak power were measured during multiple one-legged hopping and a single two-legged jump, respectively.

“The Mechanostat theory states that the skeleton adapts to loads imposed upon it, including muscle forces. Cross-sectional studies have shown associations between measures of muscle function and peripheral quantitative computed tomography (pQCT)-measured cortical bone strength. However, relatively few studies have used jumping mechanography in this context,” Hardcastle, winner of the ASBMR Young Investigator Award, said.

 

Sarah A. Hardcastle

“We found that both peak power and force were equivalently associated with bone strength as measured by pQCT,” Hardcastle said.

Median jump power was 2.25 kW (interquartile range [IQR]: 1.78-2.93) and force was 1.95 kN (IQR: 1.68-2.39). Hardcastle said that jump power, but not force, was positively associated with hip BMD (P=.01 and P=.74, respectively, following adjustment for age, gender, height and weight).

In 113 patients with both force and mid-tibial pQCT data, results also suggest a positive association between jump power and tibial strength-strain index (SSI) (standardized beta=0.26; 95% CI, 0.09-0.44) and with cortical thickness (0.33; 95% CI, 0.06-0.6), but not with total bone area (0.1; 95% CI, –0.1 to 0.3).

Data also indicate force was positively associated with SSI (0.24; 95% CI, 0.07-0.42) and total bone area (0.22; 95% CI, 0.03-0.42), but not with cortical thickness (0.05; 95% CI, –0.22 to 0.32).

These data suggest that force and power may modify cortical bone strength through distinct mechanisms, Hardcastle said. – by Samantha Costa

For more information:

Hardcastle S. Oral Poster Presentations: Clinical #FR0366. Presented at: the American Society for Bone and Mineral Research 2013 Annual Meeting; Oct. 4-7, 2013; Baltimore.

Disclosure: Hardcastle reports no relevant financial disclosures.