Multifractal Nonlinearity Moderates Feedforward and Feedback Responses to Suprapostural Perturbations.
An adaptive response to unexpected perturbations requires near-term and long-term adjustments over time. We used multifractal analysis to test how nonlinear interactions across timescales might support an adaptive response following an unpredictable perturbation. We reanalyzed torque data from 44 yo...
| Publicado en: | Perceptual & Motor Skills Vol. 130; no. 2; pp. 622 - 658 |
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| Autores principales: | , , , , |
| Formato: | Artículo |
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Sage Publications Inc.
Apr2023
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=162731626&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 162731626 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 00315125 PSK jtl: Perceptual & Motor Skills issn: 00315125 maglogo: Y pubinfo: dt: Apr2023 vid: 130 iid: 2 pid: 344 pub: Sage Publications Inc. artinfo: ui: 162731626 10.1177/00315125221149147 ppf: 622 ppct: 36 formats: tig: atl: Multifractal Nonlinearity Moderates Feedforward and Feedback Responses to Suprapostural Perturbations. aug: au: Kelty-Stephen, Damian G. Lee, Jinhyun Cole, Keith R. Shields, Richard K. Mangalam, Madhur affil: Department of Psychology, 14821 State University of New York at New Paltz, New Paltz, NY, USA Department of Physical Therapy and Rehabilitation Sciences, 573932 University of Iowa, Iowa City, IA, USA Department of Health, Human Function, and Rehabilitation Science, 50430 George Washington University, Washington, DC, USA Division of Biomechanics and Research Development, Department of Biomechanics, and Center for Research in Human Movement Variability, 14720 University of Nebraska at Omaha, Omaha, NE, USA su: Age distribution Task performance Anxiety Psychological adaptation Motor ability Knee physiology Torque Time Body movement Posture Descriptive statistics Research funding sug: subj: Age distribution Task performance Anxiety Psychological adaptation Motor ability Knee physiology Torque Time Body movement Posture Descriptive statistics Research funding keyword: cascade dynamics fractal perception and action perturbation rehabilitation cascade dynamics fractal perception and action perturbation rehabilitation ab: An adaptive response to unexpected perturbations requires near-term and long-term adjustments over time. We used multifractal analysis to test how nonlinear interactions across timescales might support an adaptive response following an unpredictable perturbation. We reanalyzed torque data from 44 young and 24 older adults who performed a single-leg squat task challenged by an unexpected mechanical perturbation and a secondary visual-cognitive task. We report three findings: (a) multifractal nonlinearity interacted with pre-perturbation torque production and task error to presage greater pre-voluntary feedforward increases and greater voluntary reductions, respectively, in post-perturbation task error; (b) multifractal nonlinearity presaged relatively smaller task error than standard deviations of both pre-perturbation torques and pre-perturbation task error; and (c) increased task demand (e.g., age-related changes in dexterity and dual-task settings) led to multifractal nonlinearity presaging reduced task error. All these results were consistent with our expectations, except that a pre-perturbation knee torque-dependent increase in post-perturbation task error appeared later for older than for younger participants. This correlational multifractal modeling offered theoretical clarity on the possible roles of nonlinear interactions across timescales, moderating both feedforward and feedback processes, and presaging greater stability when the standard deviation is relatively large and task demands are strong. Thus, multifractal nonlinearity usefully describes movement variability even when paired with classical descriptors like the standard deviation. We discuss potential insights from these findings for understanding suprapostural dexterity and developing rehabilitative interventions. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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