TY - JOUR
T1 - Concurrent validity and between-unit reliability of a foot-mounted inertial measurement unit to measure velocity during team sport activity
AU - Myhill, N.
AU - Weaving, D.
AU - Robinson, M.
AU - Barrett, S.
AU - Emmonds, S.
N1 - Publisher Copyright:
© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
PY - 2023/7/18
Y1 - 2023/7/18
N2 - The concurrent validity and between-unit reliability of a foot-mounted inertial measurement unit (F-IMU) was investigated during linear and change of direction running drills. Sixteen individuals performed four repetitions of two drills (maximal acceleration and flying 10 m sprint) and five repetitions of a multi-directional movement protocol. Participants wore two F-IMUs (Playermaker) and 10 retro-reflective markers to allow for comparisons to the criterion system (Qualisys). Validity of the F-IMU derived velocity was assessed via root-mean-square error (RMSE), 95% limits of agreement (LoA) and mean difference with 95% confidence interval (CI). Between-unit reliability was assessed via intraclass correlation (ICC) with 90% CI and 95% LoA. The mean difference for instantaneous velocity for all participants and drills combined was −0.048 ± 0.581 m ∙ s −1, the LoA were from −1.09 to −1.186 m ∙ s −1 and RMSE was 0.583 m ∙ s −1. The ICC ranged from 0.84 to 1, with LoA from −7.412 to 2.924 m ∙ s −1. Differences were dependent on the reference speed, with the greatest absolute difference (−0.66 m ∙ s −1) found at velocities above 7 m ∙ s −1. Between-unit reliability of the F-IMU ranges from good to excellent for all locomotor characteristics. Playermaker has good agreement with 3D motion capture for velocity and good to excellent between-unit reliability.
AB - The concurrent validity and between-unit reliability of a foot-mounted inertial measurement unit (F-IMU) was investigated during linear and change of direction running drills. Sixteen individuals performed four repetitions of two drills (maximal acceleration and flying 10 m sprint) and five repetitions of a multi-directional movement protocol. Participants wore two F-IMUs (Playermaker) and 10 retro-reflective markers to allow for comparisons to the criterion system (Qualisys). Validity of the F-IMU derived velocity was assessed via root-mean-square error (RMSE), 95% limits of agreement (LoA) and mean difference with 95% confidence interval (CI). Between-unit reliability was assessed via intraclass correlation (ICC) with 90% CI and 95% LoA. The mean difference for instantaneous velocity for all participants and drills combined was −0.048 ± 0.581 m ∙ s −1, the LoA were from −1.09 to −1.186 m ∙ s −1 and RMSE was 0.583 m ∙ s −1. The ICC ranged from 0.84 to 1, with LoA from −7.412 to 2.924 m ∙ s −1. Differences were dependent on the reference speed, with the greatest absolute difference (−0.66 m ∙ s −1) found at velocities above 7 m ∙ s −1. Between-unit reliability of the F-IMU ranges from good to excellent for all locomotor characteristics. Playermaker has good agreement with 3D motion capture for velocity and good to excellent between-unit reliability.
KW - Inertial measurement unit
KW - locomotor activities
KW - reliability
KW - validity
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U2 - 10.1080/24733938.2023.2237493
DO - 10.1080/24733938.2023.2237493
M3 - Article (journal)
SN - 2473-3938
SP - 1
EP - 9
JO - Science and Medicine in Football
JF - Science and Medicine in Football
ER -