48 | Chapter 3 place, raising each knee to the tape on the wall for as many times as possible in the 2 minute period. The number of times the right knee reaches the required height is counted. 6. Perceived Fatigue will be scored directly before and after each of the 3 physical performance tests (Timed Chair Stands Test, 10 Meter Walk Test and 2-minute Step Test) with the modified Borg’s CR10 scale (174). Physical activity Physical activity will be assessed with an inertial sensor (DynaPort MoveMonitor Plus, McRoberts BV, The Netherlands) at M0, M4 and M12 (175, 176). Participants will receive the sensor during the assessment visits at M0, M4 and M12 including corresponding instructions. The sensor will be worn on the lower back for seven consecutive days, preferably day and night, except during water activities, and will afterwards be returned by mail. The sensor includes a tri-axial gyroscope and registers trunk accelerations in vertical, mediolateral and anteroposterior directions, with a sample rate of 100 samples per second and a range of-8g to +8g for a continuous duration of 7 consecutive days. The wearing time of the sensor, the average daily time being upright (i.e. standing and shuffling), in locomotion (i.e. walking, stair walking, cycling) and time spent in sedentary behaviour (i.e. sitting and lying) will be determined. In addition to the amount of daily physical activity, the quality of daily life gait will be calculated from the accelerometry data, as a composite score of characteristics of daily life gait episodes has been shown to be predictive of falls (176). From the one-week accelerometry data, all locomotion episodes that last 10 seconds or longer will be selected and divided into epochs of 10 seconds; gait quality characteristics will be calculated for each of these 10 seconds epochs. Subsequently, gait quality characteristics will be estimated as median values over the week and the gait quality composite score will be calculated, based on a weighted sum of autocorrelation at stride frequency, power at step frequency, root mean square of the accelerations and index of harmonicity (177). Process evaluation To evaluate the In Balance intervention, participants of the intervention group will be asked to fill in a questionnaire about their expectations of the In Balance intervention at M0 and their experiences with the In Balance intervention directly after ending the intervention and at M12. Also, the experiences of the In Balance therapists will be assessed with a questionnaire after ending the In Balance intervention. To determine adherence, In Balance therapists maintain an attendance list in which the presence of the participants is logged during the In Balance intervention meetings. Participants will also be asked for the frequency and duration they conducted their homework.
RkJQdWJsaXNoZXIy MjY0ODMw