Abstract
This study evaluates the reliability and agreement of the 3D range of motion (ROM) of trunk and lower limb joints, measured by inertial measurement units (MVN BIOMECH Awinda, Xsens Technologies), during a single leg squat (SLS) and sit to stand (STS) task. Furthermore, distinction was made between movement phases, to discuss the reliability and agreement for different phases of both movement tasks. Twenty healthy participants were measured on two testing days. On day one, measurements were conducted by two operators to determine the within-session and between-operator reliability and agreement. On day two, measurements were conducted by the same operator, to determine the between-session reliability and agreement. The SLS task had lower within-session reliability and agreement compared with between-session and between-operator reliability and agreement. The reliability and agreement of the hip, knee, and ankle ROM in the sagittal plane were good for both phases of the SLS task. For both phases of STS task, within-session reliability and agreement were good, and between-session and between-operator reliability and agreement were lower in all planes. As both tasks are physically demanding, differences may be explained by inconsistent movement strategies. These results show that inertial sensor systems show promise for use in further research to investigate (mal)adaptive movement strategies.
Highlights
The use of inertial sensor technology for human motion analysis is increasing
Few studies evaluated the reliability and agreement of the hip, knee, and ankle kinematics measured by an inertial sensor system [5,6,7]
Individual results (ICC, standard error of measurement (SEM), and minimum detectable change (MDC)) of the within-session, between-session, and between-operator can be found in the Supplementary Materials (Tables S1 and S2)
Summary
The use of inertial sensor technology for human motion analysis is increasing. Inertial sensor technology fuses signals from the accelerometer, gyroscope, and magnetometer to estimate the orientation and position of a body segment [1,2]. By applying multiple inertial measurement units on different body segments, three dimensional (3D) joint kinematics can be obtained outside the laboratory [3]. Before an inertial sensor system can be used in clinical practice, it is important to establish the validity and reliability. Multiple studies have evaluated the validity or reliability of (3D) kinematics measured by an inertial sensor system [4]. Few studies evaluated the reliability and agreement of the hip, knee, and ankle kinematics measured by an inertial sensor system [5,6,7].
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