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Pataky, T, Robinson, MA, Vanrenterghem, J and Donnelly, C (2022) Simultaneously assessing amplitude and temporal effects in biomechanical trajectories using nonlinear registration and statistical nonparametric mapping. Journal of Biomechanics, 136. ISSN 0021-9290
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Abstract
Biomechanical trajectories generally embody amplitude and temporal effects, but these effects are often analyzed separately. Here we demonstrate how amplitude–phase separation techniques from the statistics literature can be used to simultaneously analyze both. The approach hinges on nonlinear registration, which temporally warps trajectories to minimize timing effects, and the resulting optimal time warps can be combined with the resulting amplitudes in a simultaneous test. We first analyzed two simulated datasets with controlled amplitude and temporal effects to demonstrate how amplitude–timing separation can avoid incorrect conclusions from common amplitude-only hypothesis testing. We then analyzed two experimental datasets, demonstrating how amplitude–phase separation can yield unique perspectives on the relative contributions of amplitude and timing effects embodied in biomechanical trajectories. Last, we show that the proposed approach can be sensitive to procedural and parameter specifics, so we recommend that these sensitivities should be explored and reported.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Biomechanical trajectory analysis; Data processing; Statistical analysis; Temporal warping; Time normalization; Biomedical Engineering; 0903 Biomedical Engineering; 0913 Mechanical Engineering; 1106 Human Movement and Sports Sciences |
| Subjects: | R Medicine > RC Internal medicine > RC1200 Sports Medicine |
| Divisions: | Sport & Exercise Sciences |
| Publisher: | Elsevier |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 10 Jun 2022 09:24 |
| Last Modified: | 14 Apr 2023 00:50 |
| DOI or ID number: | 10.1016/j.jbiomech.2022.111049 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/17045 |
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