EXAS Quality of performance intrarater reliability
Description
Aim: To assess the intrarater reliability of the quality of performance score of the Exercise Adherence Scale (EXAS) For the reliability study, two researchers included a convenience sample of healthy adults who were aged 18-65 years old and had sufficient command of the Dutch language to read and understand written or spoken instructions. Potential participants were excluded if they were unable to perform exercises due to physical or mental problems or when performing exercises caused pain or discomfort. Recruitment took place at Fontys University of Applied Sciences, the Netherlands. A total of four different exercises commonly recommended by physiotherapists in HBE programs for LBP were selected for reliability testing by an panel of physiotherapists specialised in treating patients with LBP. The selected exercises were the squat, the deadlift using a broomstick, the lunge and the bridge exercise. For each exercise, participants were asked to watch an instruction video showing an actor performing the exercises and were provided with additional written instructions. Participants were allowed to review the video and instructions up to three times and then performed the exercise to the best of their ability. Participant performance of the exercise was recorded using two high definition video cameras (JVC Everio GZ-HM300, JVC, Yokohama, Japan) capturing video at 30 frames per second set up at a distance of 3 meters from the front and the left side. The process was repeated until the participant had completed all four exercises and recordings were successfully collected. Following this, a physiotherapist was asked to rate the quality of performance of the exercises by the participants using the video recordings. One week later, the same physiotherapist repeated the process to complete data collection for intrarater reliability. Data was analysed using SPSS 23. Intrarater reliability was assessed using Cohen’s Kappa with quadratic weights and it's 95% confidence interval was determined. The results show a K(qw)=0.87 (95%-CI 0.83-0.92).