Supervised Physical Activity in Young Women With Early Breast Cancer During Neoadjuvant Chemotherpy

HIIT training twice a week throughout the chemotherapy: treadmill, elliptical, stationary bicycle and indoor rower. The intensity of physical activity will be increasing during consecutive mesocycles. Each training session will begin with a 10-min. wole-body warm-up session at 50-60% hear rate (HR) max. Mesocycle 1 - one month with 4 sets of 1 min. 45 sec. of exercise at a maximal intensity of 75% HR max. Mesocycle 2 with exercises at 80% to 90% HR max divided into 3 periods: 1/ one month, session of 5 sets 1 min. 30 sec. each; 2/ two months, sessions of 5 sets 1 min. 45 sec. each; 3/ two months, sessions of 5 sets 2 min. each. Moreover patients will be instructed to individually perform- a 45-min. aerobic training session (e.g.: walking, jogging, roller skating, swimming) once a week, in patient's own time.

Patients aged 18 to 40 in good physical condition (Eastern Cooperative Oncology Group (ECOG) scale 0-1) who are set to receive neoadjuvant chemotherapy will be selected. Criteria for entry into the study include proper liver, kidney and bone marrow function as well as heart ejection fraction of ≥ 50%. Treatment will be carried out according to 4 x AC regimen (doxorubicin 60 mg/ m2 cyclophosphamide 600 mg/ m2 i.v. every 21 or every 14 days + pegfilgastrim) followed by 12 x paclitaxel 80 mg/ m2 every 7 days and in the case of HER2 positive tumors trastuzumab ± pertuzumab (according to SPC).

Patients will be asked to perform 150-300 min. of moderate-intensity aerobic activity or 75-150 min. of vigorous aerobic activity. Each participant will be monitored by an activity watch worn at all times by the patient.