Objective profiling of varied human motion based on normative assessment of magnetometer time series data

Claire M Barnes, Cain C T Clark, Paul Rees, Gareth Stratton, Huw D Summers

Research output: Contribution to journalArticle

2 Citations (Scopus)
13 Downloads (Pure)

Abstract

OBJECTIVE: To quantify varied human motion and obtain an objective assessment of relative performance across a cohort.

APPROACH: A wrist-worn magnetometer was used to record and quantify the complex motion patterns of 55 children aged 10 to 12 years old, generated during a fundamental movement skills programme. Sensor-based quantification of the physical activity used dynamic time warping of the magnetometer time series data for pairs of children. Pairwise comparison across the whole cohort produced a similarity matrix of all child to child correlations. Normative assessment scores were based on the Euclidean distance between n participants within an n  -  1 multi-variate space, created from multi-dimensional scaling of the similarity matrix. The sensor-based scores were compared to the current standardised assessment which involves binary scoring of technique, outcome and time components by trained assessors.

MAIN RESULTS: Visualisation of the relative performance using the first three axes of the multi-dimensional matrix, shows a 'performance sphere' in which children sit on concentric shells of increasing radius as performance deteriorates. Good agreement between standard and sensor scores is found, with Spearman rank correlation coefficients of the overall activity score in the range of 0.62-0.71 for different cohorts and a kappa statistic of 0.34 for categorisation of all 55 children into lower, middle, upper tertile and top 5% bands.

SIGNIFICANCE: By using multi-dimensional analysis of similarity measures between participants rather than direct parameterisation of the physiological data, complex and varied patterns of physical motion can be quantified, allowing objective and robust profiling of relative function across participant groups.

Original languageEnglish
JournalPhysiological Measurement
Volume39
Issue number4
Early online date27 Mar 2018
DOIs
Publication statusPublished - 26 Apr 2018
Externally publishedYes

Fingerprint

Magnetometers
Time series
Sensors
Parameterization
Visualization
Statistics
Nonparametric Statistics
Wrist
Exercise

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • magnetometer
  • time series analysis
  • dynamic time warping
  • movement skill
  • physical activity
  • multi-dimensional scaling

Cite this

Objective profiling of varied human motion based on normative assessment of magnetometer time series data. / Barnes, Claire M; Clark, Cain C T; Rees, Paul; Stratton, Gareth; Summers, Huw D.

In: Physiological Measurement, Vol. 39, No. 4, 26.04.2018.

Research output: Contribution to journalArticle

Barnes, Claire M ; Clark, Cain C T ; Rees, Paul ; Stratton, Gareth ; Summers, Huw D. / Objective profiling of varied human motion based on normative assessment of magnetometer time series data. In: Physiological Measurement. 2018 ; Vol. 39, No. 4.
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