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Women recover muscle strength more slowly than men
Date:9/25/2008

Women's muscles may require longer, more intensive rehabilitation after bed rest and cast immobilization, as reported today by the Institute for Neuromusculoskeletal Research at the Ohio University College of Osteopathic Medicine (OU-COM).

According to Brian C. Clark, Ph.D., assistant professor of neuromuscular biology, the discrepancy may relate to how sex-specific hormones regulate the growth of muscle mass. The study is the first to report sex differences in muscle strength restoration following immobilization of a limb.

"Our findings may have important implications for how women are treated for fractures, including more and/or different rehabilitation methods," Clark said.

Clark worked on the study with Ohio University researchers Richard L. Hoffman and David W. Russ, Ph.D., as well as Todd M. Manini, Ph.D., of the University of Florida. The team discussed their findings this week at the Integrative Biology of Exercise meeting, hosted by the American Physiology Society (APS) in Hilton Head, S.C. A report of their preliminary data will appear in an upcoming issue of Archives of Physical Medicine and Rehabilitation.

The researchers set casts to the non-dominant wrists and hands of 10 healthy volunteers five men and five women for three weeks. Wrist muscle strength was measured prior to placement of the casts, weekly during immobilization and one week after cast removal. Researchers also used electrical stimulation to induce muscle contractions, which showed how well the participants' nervous systems were able to activate their wrist muscles.

Results showed that men and women lost muscle strength at similar rates during immobilization. But within one week of cast removal, the men's strength returned almost to pre-cast levels, while the women's strength levels remained 30 percent lower than normal.

Immobilization did reduce the ability of the nervous system to activate wrist muscles, and the r
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Contact: Karoline Lane
lanek@ohio.edu
740-593-2261
Ohio University
Source:Eurekalert

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