Payne, J. K., Held, J., Thorpe, J., & Shaw, H. (2008). Effect of exercise on biomarkers, fatigue, sleep disturbances, and depressive symptoms in older women with breast cancer receiving hormonal therapy. Oncology Nursing Forum, 35, 635–642.
To determine if a home-based walking program is more effective than usual care in reducing fatigue, sleep disturbances, and symptoms of depression in older women receiving hormone treatment for breast cancer.
Patients were recruited from breast cancer clinics and randomized to usual care or a prescribed exercise program that focused on walking. Researchers followed patients' progress over a 14-week period. Patients completed study instruments at baseline, two weeks later via mail, 12 weeks after baseline at a clinic visit, and 14 weeks after baseline via mail. Cortisol, serotonin, interleukin-6 (IL-6), and bilirubin were collected at the initial clinic visit and again at three months. At visit 1 and at 12 weeks, patients were asked to wear a sleep-watch actigraph for 72 continuous hours. The walking exercise intervention was a moderate walking activity for 20 minutes, four times a week. Patients were to log the duration and frequency of walking activity.
The study was a longitudinal, repeated-measures, randomized, clinical trial.
Levels of fatigue over time and between groups were not significantly different. PSQI scores decreased significantly over time in the exercise group (p = 0.007) and did not change in the usual care control. Actigraphy analysis after 12 weeks showed a shorter wake time (p = 0.02), sleep time (p = 0.05), and less movement during sleep (p = 0.002) in the exercise group. There was no difference between groups in regard to sleep efficiency, which is the ratio of total sleep time to time in bed. There were no differences in cortisol levels over time or between groups. ANOVA showed a significant difference between groups and across time in serotonin levels, with an intervention effect of exercise (p = 0.009). There were no differences between groups or over time in regard to symptoms of depression.
A home-based walking intervention appears to be acceptable to older women receiving hormone therapy for breast cancer and an intervention that is feasible for use in that population. Decline in PSQI scores in the exercise group suggest that this type of intervention may help improve sleep quality in this population. Effects of the exercise intervention on biomarkers are unclear.
An exercise program involving walking may be helpful to patients receiving hormone treatment for breast cancer, but the actual effects of such a program on fatigue, sleep, and symptoms of depression are unclear.