Back to Search
Start Over
The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start.
- Source :
- Sports Biomechanics; 2018, Vol. 17 Issue 3, p383-401, 19p
- Publication Year :
- 2018
-
Abstract
- The aim of this study was to quantify the validity and intra-tester reliability of a novel method of kinematic measurement. The measurement target was the joint angles of an athlete performing a BMX Supercross (SX) gate start action through the first 1.2 s of movement in situ on a BMX SX ramp using a standard gate start procedure. The method employed GoPro® Hero 4 Silver (GoPro Inc., USA) cameras capturing data at 120 fps 720 p on a 'normal' lens setting. Kinovea 0.8.15 (Kinovea.org, France) was used for analysis. Tracking data was exported and angles computed in Matlab (Mathworks®, USA). The gold standard 3D method for joint angle measurement could not safely be employed in this environment, so a rigid angle was used. Validity was measured to be within 2°. Intratester reliability was measured by the same tester performing the analysis twice with an average of 55 days between analyses. Intra-tester reliability was high, with an absolute error <6° and <9 frames (0.075 s) across all angles and time points for key positions, respectively. The methodology is valid within 2° and reliable within 6° for the calculation of joint angles in the first -1.25 s. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14763141
- Volume :
- 17
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Sports Biomechanics
- Publication Type :
- Academic Journal
- Accession number :
- 132687152
- Full Text :
- https://doi.org/10.1080/14763141.2017.1353129