Are tibial angles measured with inertial sensors useful surrogates for frontal plane projection angles using 2-dimensional video analysis during single leg squat tasks? A reliability and agreement analysis in elite football (soccer) players

Hughes, T; Jones, R; Starbuck, C; Picot, J; Sergeant, JC; Callaghan, MJ

Abstract

During single leg squats (SLS), tibial angle (TA) quantification using inertial measurement units (IMU) may offer
a practical alternative to frontal plane projection angle (FPPA) measurement using 2-dimensional (2D) video
analysis. This study determined: (i) the reliability of IMUs and 2D video analysis for TA measurement, and 2D
video analysis for FPPA measurement; (ii) the agreement between IMU TA and both 2D video TA and FPPA
measurements during single leg squats in elite footballers. 18 players were tested on consecutive days. Absolute
TA (ATA) and relative TA (RTA) were measured with IMUs. ATA and FPPA were measured concurrently using
2D video analysis. Within-session reliability for all measurements varied across days (intraclass correlation
coefficient (ICC) range=0.27–0.83, standard error of measurement (SEM) range=2.12–6.23°, minimal detectable
change (MDC) range=5.87–17.26°). Between-sessions, ATA reliability was good for both systems
(ICCs=0.70–0.74, SEMs=1.64–7.53°, MDCs=4.55–7.01°), while IMU RTA and 2D FPPA reliability ranged
from poor to good (ICCs=0.39–0.72, SEMs=2.60–5.99°, MDCs=7.20–16.61°). All limits of agreement exceeded
a 5° acceptability threshold. Both systems were reliable for between-session ATA, although agreement
was poor. IMU RTA and 2D video FPPA reliability was variable. For SLS assessment, IMU derived TAs are not
useful surrogates for 2D video FPPA measures in this population.

Citation

Hughes, T., Jones, R., Starbuck, C., Picot, J., Sergeant, J., & Callaghan, M. (2019). Are tibial angles measured with inertial sensors useful surrogates for frontal plane projection angles using 2-dimensional video analysis during single leg squat tasks? A reliability and agreement analysis in elite football (soccer) players. Journal of Electro - myography and Kinesiology, 44, 21-30. https://doi.org/10.1016/j.jelekin.2018.11.005

• Journal Article Type: Article
• Acceptance Date: Nov 8, 2018
• Online Publication Date: Nov 10, 2018
• Publication Date: Feb 1, 2019
• Deposit Date: Nov 22, 2018
• Publicly Available Date: Nov 22, 2018
• Journal: Journal of Electromyography and Kinesiology
• Print ISSN: 1050-6411
• Publisher: Elsevier
• Volume: 44
• Pages: 21-30
• DOI: https://doi.org/10.1016/j.jelekin.2018.11.005
• Publisher URL: https://doi.org/10.1016/j.jelekin.2018.11.005
• Related Public URLs: https://www.journals.elsevier.com/journal-of-electromyography-and-kinesiology