İki boyutlu hareket analizinde hareketli kamera aparatının uyum geçerliği: bir yüzme çalışması

Abstract

This study describes the building of a moving camera apparatus for use in video-based motion analysis and reports its validity in the horizontal velocity of freestyle swimming. Nine male swimmers (height = 178.3 ± 6.3cm, weight = 82.6 ± 5.8 kg, age = 22.3 ± 3.86 years) participated to the study. Twenty meters freestyle swimming performances were recorded using both a moving camera apparatus and a stationary camera. A marker placed on the lumbar region of the swimmers was tracked to calculate horizontal velocity. After 2D motion analyses, the data obtained by two different methods were investigated. Horizontal velocities calculated using stationary camera recordings were taken as reference. Results showed that the horizontal velocities calculated using the moving camera apparatus’s recordings did not deviate from reference values more than 0.05 m/s at any point of the time series. Hoeffding’s D measure test revealed significant dependencies for 18 data couples (p<.05) indicating data series draw a similar trajectory. In conclusion, the accuracy of the apparatus allows for kinematic analyses in swimming and the can be used as an alternative to stationary cameras.