title: A wireless accelerometer node for reliable and valid measurement of lumbar accelerations during treadmill running.
abstract: This study investigated the reliability of a wireless accelerometer and its agreement with optical motion capture for the measurement of root mean square (RMS) acceleration during running. RMS acceleration provides a whole-body metric of movement mechanics and economy. Fifteen healthy college-age participants performed treadmill running for two 60-s trials at 2.22, 2.78, and 3.33 m/s and one trial of 150 s (five 30-s epochs) at 2.78 m/s. We assessed between-trial and within-trial reliability, and agreement in each axis between a trunk-mounted wireless accelerometer and a reflective marker on the accelerometer measured by optical motion capture. Intraclass correlations assessing between-trial repeatability were 0.89-0.97, depending on the axis, and intraclass correlations assessing within-trial repeatability were 0.99-1.00. Bland-Altman analyses assessing agreement indicated mean difference values between -0.03 and 0.03 g, depending on the axis. Anterio-posterior acceleration had the greatest limits of agreement (LOA) (±0.12 g) and vertical acceleration had the smallest LOA (±0.03 g). For measuring RMS acceleration of the trunk, this wireless accelerometer node provides repeatable and valid measurement compared with the standard laboratory method of optical motion capture.
authors.affiliation: a School of Health Promotion & Human Performance , Eastern Michigan University , Ypsilanti , MI , USA.
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Lindsay
authors.affiliation: b School of Health Sciences & Human Performance , Ithaca College , Ithaca , NY , USA.
authors.forename: James A
authors.initials: JA
authors.lastname: Yaggie
authors.affiliation: a School of Health Promotion & Human Performance , Eastern Michigan University , Ypsilanti , MI , USA.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: McGregor
mesh_terms: D061725:Accelerometry / Q000295:instrumentation*; D000328:Adult; D004867:Equipment Design; D005080:Exercise Test; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D008161:Lumbosacral Region / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology; D015203:Reproducibility of Results; D012420:Running / Q000502:physiology*; D055815:Young Adult
keywords: Optical motion capture; agreement; root mean square