The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start

Josephine Grigg; Eric Haakonssen; Evelyne Rathbone; Robin Orr; Justin W L Keogh

doi:10.1080/14763141.2017.1353129

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The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start

Journal article

Peer reviewed

The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start

Josephine Grigg, Eric Haakonssen, Evelyne Rathbone, Robin Orr and Justin W L Keogh

Sports Biomechanics, Vol.17(3), pp.383-401

2018

DOI: https://doi.org/10.1080/14763141.2017.1353129

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Abstract

motion analysis

cycling

motion capture

biomechanics

performance analysis

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°. Intra-tester 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.

Details

Title: The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start
Authors: Josephine Grigg (Author) - Bond University
Eric Haakonssen (Author) - Australian Institute of Sport
Evelyne Rathbone (Author) - Bond University
Robin Orr (Author) - Bond University
Justin W L Keogh (Author) - University of the Sunshine Coast
Publication details: Sports Biomechanics, Vol.17(3), pp.383-401
Publisher: Routledge
Date published: 2018
DOI: 10.1080/14763141.2017.1353129
ISSN: 1476-3141
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450446802621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Engineering, Biomedical; Sport Sciences