Markerless motion capture has now technically matured to the point where it provides a potentially promising solution to the investigation of human movement, often by the use of cutting-edge developments within computer vision and machine learning. At present optoelectronic marker-based systems provide reasonably valid and reliable measurements of human movement, but does so at the price of a costly lab setup, long participant preparation times, and the unfeasibility of attaching markers in certain settings. Such applications may include investigations into the possible short and long-term associations between motor function and musculoskeletal health.
The easy, valid, and reliable capture of gross motor function and lower extremity kinematics in young children may have a wide range of applications within both research and clinical practice. These variables are promising for use in future research but require further investigation of their clinimetric properties. The measurements by the markerless motion capture system “The Captury” cannot be considered interchangeable with the Vicon measures, but our results suggest that this system can produce estimates of jump length, jump height, KHR, AHR, knee flexion, FPKA, and FPKD, with acceptable levels of agreement and reliability. jump height to unacceptable for knee varus. Agreement and reliability ranged from acceptable for e.g. Measurement differences between the two systems varied depending on the variables. Measurement differences between the systems were expressed in terms of root mean square errors, mean differences, limits of agreement (LOA), and intraclass correlations of absolute agreement (ICC (2,1) A) and consistency of agreement. Measurement differences between the two systems were examined for the following variables: jump length, jump height, hip flexion, knee flexion, ankle dorsi flexion, knee varus, knee to hip separation distance ratio (KHR), ankle to hip separation distance ratio (AHR), frontal plane projection angle, frontal plane knee angle (FPKA), and frontal plane knee deviation (FPKD).
#Vicon motion capture series
Measures of gross motor function and lower extremity kinematics from 14 preschool children (age between three and 6 years) performing a series of squats and standing broad jumps were recorded by a marker-based (Vicon) and a markerless (The Captury) motion capture system simultaneously, in December 2015. This study aims to document the concurrent validity of a markerless motion capture system: “The Captury.” Method
It is, however, unknown if these measures are sufficiently valid and reliable in young children to warrant further use. Markerless motion capture systems can provide measures of gross motor function and kinematics outside of lab environments and with minimal interference to the subjects being investigated. Marker-based motion capture systems provide reasonably valid and reliable measures, but recordings are restricted to expensive lab environments. Investigations into the possible associations between early in life motor function and later in life musculoskeletal health, will require easily obtainable, valid, and reliable measures of gross motor function and kinematics.
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