Abstract
Physical rehabilitation aims people with physical impairments to enhance and restore their functional ability. The Microsoft Kinect v1 and v2 technologies apply depth information and machine vision techniques to generate 3D coordinates of a set of anatomical landmarks on the human body regarded as Kinect joints. Trigonometry relationship between Kinect joints can be used to extract body Range of Motion (ROM). The purpose of this study was to evaluate stability of Kinect for ROM measurement during static stretching exercises. According to the literature, the stability of Kinect in static exercises has been reported to a limited extent. 13 healthy men participated in this study and performed 5 exercises in 2 different distances from the cameras. Exercises were recorded by Kinect v1 and Kinect v2, concurrently. The stability of Kinect was also evaluated for 5 ROMs including: elbow flexion, shoulder abduction, wrist pronation, wrist flexion, and wrist ulnar deviation. Maximum and average joint displacement errors were used for stability analysis. Results showed that Kinect v2 is more stable compared to Kinect v1. Kinect v2 joints showed displacement error of more than 15 mm for wrist. For the other joints, Kinect showed an average displacement error of less than 10 mm.
Highlights
One of the important objectives of physical rehabilitation is to optimally restore the lost motor functionality resulted from disabling impairment or disease
The following abbreviation were used for better readability: K1: K2, D1: D2, P1:P13, and Exercise 1 (E1):Exercise 5 (E5), denote Kinect v1, Kinect v2, distance at 2 m form camera, distance at 3m from camera, participant 1 through 13, and exercises 1 through 5, respectively
E1K1D1P1 indicates that exercise one was performed by the first participant, at the distance of 2m from the camera, captured by Kinect v1
Summary
One of the important objectives of physical rehabilitation is to optimally restore the lost motor functionality resulted from disabling impairment or disease. The goal for the patients is to regain the ability needed for daily activities. Repetitive stretching exercises aim to improve the functionality of joints and keep joints flexible. ROM is the measurement of movement around a specific joint in a certain direction and is used to evaluate the flexibility of joints. Traditional physical therapy programs evaluate ROM with a goniometer [1]. Various technologies such as robotics and virtual reality have been used in a wide range of rehabilitation applications, including ROM measurement [2]
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