Changes in amount and intensity of physical activity over time in breast cancer survivors

Menée à partir de données portant sur 171 patientes ayant survécu à un cancer du sein, cette étude analyse l'évolution de la quantité et de l'intensité d'une activité physique, 1 et 4 ans après le diagnostic de la maladie

Résumé en anglais

Physical activity (PA) is associated with decreased breast cancer recurrence and mortality, as well as fewer treatment-related symptoms. Nevertheless, most breast cancer survivors do not meet PA guidelines. The purpose of this manuscript is to characterize PA trends over time in breast cancer survivors.Mayo Clinic Breast Disease Registry participants received surveys at baseline and at one and four years after diagnosis; breast cancer recurrence and/or metastatic disease were exclusion criteria. Participants were considered to be “meeting guidelines” if they self-reported at least 150 minutes of moderate-intensity (eg, fast walking) and/or strenuous (eg, jogging) PA per week. Statistical analyses include analysis of covariance methods, paired t-tests, conditional logistic regression models, and McNemar tests of homogeneity.171 participants were included in the analysis. The amount of total PA decreased over time (p = 0.07). Mild-intensity PA (eg, easy walking) decreased most over time (p = 0.05). Among participants aged 18-49, mild-intensity (p = 0.05) and moderate-intensity (p = 0.02) PA decreased over time. Strenuous-intensity PA levels decreased over time among participants with a normal body mass index (p = 0.002) and with obesity (p = 0.01).We found a trend-level decrease in total PA over time, driven mostly by a decrease in mild-intensity PA. Young breast cancer survivors are especially likely to reduce their PA over time. Further research on implementing PA guidelines in clinical practice is warranted.