Assessing agreement between angular data obtained by inertial measurement sensors and video recordings in two-dimensional gait analysis
Physical Education and Sports Department, Nevşehir Hacı Bektaş Veli University, Nevşehir, Turkey
Keywords: Kinematics, gait analysis, video-based analysis, inertial measurement sensors
Objective: Inertial measurement sensors have recently been used to support video-based motion analysis and, have become a standalone measurement tool in time. These devices, which are not affected by the disadvantages of the camera such as the angle of view and lens-induced image distortions, can easily present the data that video-based motion analysis can hardly present when correct analysis techniques are used. The purpose of this study is to examine the agreement of angular values calculated from the data obtained from camera images and inertial measurement sensors for use in gait analysis.
Materials and Method: In the study, 3 male (age: 21±1.57years, height: 178±3.86cm), and 3 female (age: 20±0.46years, height: 161±2.26cm) participants were asked to walk straight through on an 8-meter predetermined walking way 3 times. Six passive markers were placed on the left lower extremity to calculate angular values from video recordings and 3 inertial measurement units were placed on the same extremity to calculate angular values using units. Thigh, calf and foot angles were calculated using the data obtained from two different measurement methods. Complementary filtering method was used to calculate angular values from the sensor data. To assess the agreement between data, Bland-Altman graphs and One Sample Tests were used.
Results: Following examination of the Bland-Altman graphics, it was determined that 54 data set pairs were in agreement with 95% confidence interval. The results of the One Sample T-Tests revealed that the differences of the angular values of the body parts obtained using two different measurement methods did not differ statistically from 0 (p>.05).
Conclusion: These results show that inertial measurement sensors can be used as an alternative to image capture systems in kinematic analysis, where angular values are examined.
Cite this article as: Odek U. Assessing agreement between angular data obtained by inertial measurement sensors and video recordings in two-dimensional gait analysis. Turk J Sports Med. 2021;56(1):13-19.; http://dx.doi.org/10.47447/tjsm.0434
The authors declared no conflicts of interest with respect to authorship and/or publication of the article.
The authors received no financial support for the research and/or publication of this article.