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    Can Walking Ward Off Bone Loss?

    Study Shows Walking Builds Bone Mass in Men Getting Prostate Cancer Treatment
    By
    WebMD Health News
    Reviewed by Louise Chang, MD

    Oct. 29, 2007 (Los Angeles) -- Brisk walking may reverse the severe bone loss associated with a common prostate cancer therapy, curbing the risk of fractures and osteoporosis, researchers report.

    In a small study of men undergoing androgen deprivation therapy (ADT) and radiation for prostate cancer, strolling at a rapid pace for 30 minutes five days a week for eight weeks built bone strength.

    In contrast, men who didn't exercise lost bone mass, says researcher Paula Chiplis, PhD, RN, a clinical instructor and senior research assistant in the department of nursing at Johns Hopkins Hospital in Baltimore.

    "With exercise, prostate cancer patients gained bone density at a time in life when even healthy men are starting to lose bone density. This is really exciting," Jennifer Wenzel, PhD, RN, a researcher at Johns Hopkins who also worked on the study, tells WebMD.

    The findings were reported at the American Society for Therapeutic Radiology and Oncology's annual meeting.

    Hormone Therapy

    Men with localized cancer that is confined to the prostate gland can be treated with radiation therapy along with ADT. Radiation is used to kill the cancer cells. ADT inhibits the production of hormones called androgens that feed cancer cells, slowing tumor growth and improving the odds of survival.

    But androgens also help build bone strength, so suppressing them results in a form of "male menopause," which weakens the bones and increases the risk of fractures and osteoporosis, Chiplis says.

    Radiation is also thought to weaken bones, although the reasons are less clear, she adds.

    Brisk Walking Builds Bones

    But exercise can change all that, Chiplis says. In the study, brisk walking led to a 0.49% gain in bone mass in just eight to 10 weeks.

    Men who didn't exercise lost 2.21% of their bone mass in the two-month study period; placed in context, healthy men lose between 0.5 to 1% of their bone mass per year, beginning in middle age, she says.

    And men undergoing ADT lose 4% to 13% of their bone density annually, Chiplis tells WebMD. "Given these benchmarks, the effect of exercise is huge."

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