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

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

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°. 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.

Original languageEnglish
Pages (from-to)383-401
Number of pages19
JournalSports Biomechanics
Volume17
Issue number3
Early online date13 Nov 2017
DOIs
Publication statusPublished - 3 Jul 2018

Fingerprint

Biomechanical Phenomena
Joints
Architectural Accessibility
Silver
Athletes
Lenses
France

Cite this

@article{6244ded691e049a98c86b98a4aa9ad35,
title = "The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start",
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{\circledR} 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{\circledR}, 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.",
author = "Josephine Grigg and Eric Haakonssen and Evelyne Rathbone and Robin Orr and Keogh, {Justin W L}",
year = "2018",
month = "7",
day = "3",
doi = "10.1080/14763141.2017.1353129",
language = "English",
volume = "17",
pages = "383--401",
journal = "Sports Biomechanics",
issn = "1476-3141",
publisher = "Routledge",
number = "3",

}

The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start. / Grigg, Josephine; Haakonssen, Eric; Rathbone, Evelyne; Orr, Robin; Keogh, Justin W L.

In: Sports Biomechanics, Vol. 17, No. 3, 03.07.2018, p. 383-401.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The validity and intra-tester reliability of markerless motion capture to analyse kinematics of the BMX Supercross gate start

AU - Grigg, Josephine

AU - Haakonssen, Eric

AU - Rathbone, Evelyne

AU - Orr, Robin

AU - Keogh, Justin W L

PY - 2018/7/3

Y1 - 2018/7/3

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85033680511&partnerID=8YFLogxK

U2 - 10.1080/14763141.2017.1353129

DO - 10.1080/14763141.2017.1353129

M3 - Article

VL - 17

SP - 383

EP - 401

JO - Sports Biomechanics

JF - Sports Biomechanics

SN - 1476-3141

IS - 3

ER -