
This prospective, single-arm observational trial examines whether aromatase inhibitor therapy in postmenopausal women with HR-positive breast cancer adversely affects cardiorespiratory fitness, skeletal muscle function, and immunosenescence.

This prospective, single-arm observational trial examines whether aromatase inhibitor therapy in postmenopausal women with HR-positive breast cancer adversely affects cardiorespiratory fitness, skeletal muscle function, and immunosenescence.