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Article

December 15, 2013

Exercise Improves Joint Pain Related to Aromatase Inhibitors

Author(s):

Jon Garinn

When it comes to relieving joint pain from aromatase inhibitors, motion is lotion.

Asked why she continued her acting career into her later years, Helen Hayes responded, “If you rest, you rust.” That philosophy seems to underscore new research about how best to relieve the joint pain and stiffness experienced by survivors of breast cancer who are taking aromatase inhibitors: Not by resting those achy joints but by putting them in motion.

Postmenopausal women whose breast cancer is fueled by hormones (estrogen receptor-positive breast cancer) are typically prescribed aromatase inhibitors (AIs), a class of drugs that include anastrozole, letrozole and exemestane, for five years after surgery or primary treatment. AIs stop the production of estrogen by blocking the enzyme aromatase, which is responsible for converting the hormone androgen into estrogen. But AIs can cause sometimes debilitating side effects, such as bone loss and heart problems. The most common side effect, experienced by about half of women taking an AI, is arthralgia, a joint pain so persistent that it is reported to be the main reason women stop taking the drug.

At the 2013 San Antonio Breast Cancer Symposium, Melinda L. Irwin, co-leader of the Cancer Prevention and Control Research Program at the Yale Cancer Center, presented data from a randomized trial that investigated the impact of a year-long exercise program on women who were taking AIs and experiencing joint pain.

The HOPE (Hormone and Physical Exercise) study examined 121 women who were physically inactive but able to exercise, and who had been taking an AI for a minimum of six months. The participants, all of whom reported experiencing at least mild joint pain, were randomized to receive standard care (which included written information on the importance of exercise) or to participate in an exercise program that included twice-weekly supervised resistance and strength training sessions and at least 150 minutes per week of moderate-intensity aerobic exercise. Participants in the exercise group received free personal training and gym memberships.

After 12 months, the participants in the exercise group experienced a 20 to 30 percent decrease in joint pain, in addition to other benefits, such as weight loss, and an increase in cardio-respiratory fitness. Participants receiving standard care reported a slight increase in pain. Irwin noted that 80 percent of participants in the exercise group successfully adhered to the regimen, due in part to the free access to personal trainers and fitness facilities. She further noted that the improvement in pain from exercise was better than from other arthralgia therapies previously tested, such as glucosamine, vitamin D and acupuncture.

She also acknowledged that it has long been known that exercise is good for what ails people, yet, similar to the general population, more than 70 percent of cancer survivors are inactive.

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