Transitions of postural coordination as a function of frequency of the moving support platform
| Autor: | Aviroop Dutt-Mazumder, Karl M. Newell |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Adult
Male Phase transition Biophysics Experimental and Cognitive Psychology Functional Laterality 050105 experimental psychology Body Mass Index Postural control Young Adult 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine Center of pressure (terrestrial locomotion) Control theory Multi joint coordination Humans 0501 psychology and cognitive sciences Orthopedics and Sports Medicine Dynamic balance Postural Balance Scaling Physics 05 social sciences General Medicine Biomechanical Phenomena Critical frequency Practice Psychological Head Movements Support surface Psychomotor Performance 030217 neurology & neurosurgery |
| Zdroj: | Human Movement Science. 52:24-35 |
| ISSN: | 0167-9457 |
| DOI: | 10.1016/j.humov.2017.01.006 |
| Popis: | This study was set-up to investigate the multi-segmental organization of human postural control in a dynamic balance task. The focus was on the coupling between the center of mass (CoM) and center of pressure (CoP) as a candidate collective variable that supports maintaining balance on a sinusoidal oscillating platform in the medial-lateral (ML) plane and was continuously scaled up and then down across a frequency range from 0.2 Hz to 1.2 Hz. The CoM-CoP coordination changed from in-phase to anti-phase and anti-phase to in-phase at a critical frequency (∼0.4 Hz to 0.6 Hz, respectively) in the scaling up or down of the support surface frequency, showed hysteresis as a function of the direction of frequency change and critical fluctuations at the transition region. There was evidence of head motion independent of CoM motion at the higher platform frequencies and a learning effect on several of the dynamic indices over 2 days of practice. The findings are consistent with the hypothesis of CoM-CoP acting as an emergent collective variable that is supported by the faster time scale motions of the joints and their synergies in postural control. |
| Databáze: | OpenAIRE |
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