Physical Activity Profile and Sedentary Behaviour in Adults With Cystic Fibrosis

Eligible patients will be presented with the study during a routine care visit CF center, at the end of a physiotherapy, adapted physical activity or nurse session, in accordance with the schedule for the day's visit, with no changes induced by this study. After sufficient time for reflection, patients agreeing to participate will be given self-questionnaires. From this visit, a proposal to participate at V2 will be made only to the inactive and/or hight sedentary patients on the ONAPS-PAQ questionnaire, under elexacaftor-tezacaftor-ivacaftor (ETI). Volunteers will know their participation in either actimetry or a qualitative interview following a draw. At V2, 40 patients will be offered a 7-day longitudinal follow-up by actimetry, and between 10 to 15 patients will take part in an qualitative semi-structured interview identifying motivational barriers and levers for action. At V3, patients monitored by actimetry will be invited to return their actimeter by postage-paid mail.