BACKGROUND/INTRODUCTION/OBJECTIVE: Premenopausal women treated for breast cancer are at high risk for bone loss. This trial examined the effects of a 1-year combined aerobic and resistance exercise program on bone mineral density (BMD) in women treated for premenopausal breast cancer. MATERIALS AND METHODS: Premenopausal women (n = 206) age <= 55 years at cancer diagnosis who were within two years of receiving adjuvant chemotherapy were randomized to a 12-month exercise program or a control group. BMD was measured by dual-energy x-ray absorptiometry at baseline and after 1 year; blood was drawn for skeletal markers. Change from baseline to end of study was compared within and between treatment groups using paired and unpaired t-tests. RESULTS: Lumbar spine BMD declined in both treatment groups with no significant difference between treatment groups (-0.008 +/- 0.003 g/cm2 exercise versus -0.014 +/- 0.003 g/cm2 control, p = 0.24). However, among the women who did not lose lean mass during the study (n = 100, 54 control, 46 exercise), the exercise intervention prevented lumbar spine bone loss (0.001 +/- 0.005 g/cm2 treatment group versus -0.014 +/- 0.005 g/cm2 control group, p = 0.03). Bone turnover markers decreased significantly in both groups with no differences between groups. CONCLUSIONS: Among women who maintained lean mass, our exercise intervention prevented bone loss; however, our intervention did not prevent bone loss among women who lost muscle mass. Additional investigation into exercise regimens that can prevent both bone and muscle loss may help prevent long-term consequences of premenopausal breast cancer treatment.

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