Breathing training in the process of rehabilitation after treatment for breast cancer.

All subjects will be informed about its purpose, manner of conducting and the possibility of resignation at any time during the research project. The respondents will give written consent to participate in the research. In addition, there will be an information meeting on the impact of respiratory muscle training on their muscle functions and on lung ventilation. Study group (SG): The research will cover women treated for breast cancer associated in the Wroclaw Femina Fenix Association, regularly participating in general gymnastics since the end of oncological treatment. Control group (CG): The control group will consist healthy women, never treated for neoplastic disease - students of the University of the Third Age at the University of Physical Education in Wroclaw, who also regularly participated in general improvement exercises. Several women women (both SG and CG) will be involved in inspiratory muscle training using the Treshold device (Respironics Threshold IMT). At the beginning of the program (1 day of training), each group will conduct by physiotherapist an educational lecture (1 h) on the respiratory function and hygiene and breathing support techniques, and all participants of the inspiratory muscle training will additionally lecture combine with the presentation of the device and the training instructor Inspiratory muscle training will conduct 5 times a week, of which 4 sessions at home, and 1 under the supervision of a physiotherapist. Inspiratory muscle training lasted 8 weeks. Before starting the training program, instructional classes on the proper technique of performing exercises with the Threshold IMT apparatus will carry out, while maintaining the rules consistent with the technique of proper breathing. Training take place in a standing position. After setting the individual resistance, the subjects place a nose clip and then tightly cover the mouthpiece with the mouth. The inspiratory phase will characterized by a quick, energetic, short and diaphragmatic breath. The exhale will slow, calm, and long and will to last until reaching the RV (residual volume), because every breath should start from that level. Each subject perform exercises alone on his personal training device. After the initial PImax assessment, an individual level of training load will set. The strength of the inspiratory muscles, in the first measurement, was expressed in kPa, and then it will be convert into cm H2O according to the formula 1 kPa = 10.2 cm H2O. This change allowed calculating the appropriate training load, using the Threshold IMT training device. In the first week, the training load will be 30% PImax, and each session last 5 minutes, twice a day. The value of the initial load will dictate by the safety conditions of conducting the training. In the following weeks, the load will be increased and the duration of exercise was extended during the day (60% PImax, 2x 15min). Each patient keep a participant diary in which recorded the dates and time of training. This diary is going to check by the physiotherapist once a week.