Visual contribution to human standing balance during support surface tilts

Assländer, Lorenz; Hettich, Georg; Mergner, Thomas

Visual contribution to human standing balance during support surface tilts

Dateien

Assländer_0-352019.pdfGröße: 1.14 MBDownloads: 233

Datum

2015

Autor:innen

Assländer, Lorenz

Hettich, Georg

Mergner, Thomas

Open Access-Veröffentlichung

Open Access Hybrid

Sammlungen

Sportwissenschaft

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Human movement science. 2015, 41, pp. 147-164. ISSN 0167-9457. eISSN 1872-7646. Available under: doi: 10.1016/j.humov.2015.02.010

Zusammenfassung

Visual position and velocity cues improve human standing balance, reducing sway responses to external disturbances and sway variability. Previous work suggested that human balancing is based on sensory estimates of external disturbances and their compensation using feedback mechanisms (Disturbance Estimation and Compensation, DEC model). This study investigates the visual effects on sway responses to pseudo-random support surface tilts, assuming that improvements result from lowering the velocity threshold in a tilt estimate and the position threshold in an estimate of the gravity disturbance. Center of mass (COM) sway was measured with four different tilt amplitudes, separating the effect of visual cues across the conditions 'Eyes closed' (no visual cues), '4Hz stroboscopic illumination' (visual position cues), and 'continuous illumination' (visual position and velocity cues). In a model based approach, parameters of disturbance estimators were identified. The model reproduced experimental results and showed a specific reduction of the position and velocity threshold when adding visual position and velocity cues, respectively. Sway variability was analyzed to explore a hypothesized relation between estimator thresholds and internal noise. Results suggest that adding the visual cues reduces the contribution of vestibular noise, thereby reducing sway variability and allowing for lower thresholds, which improves the disturbance compensation.

Fachgebiet (DDC)

796 Sport

Zitieren

ISO 690

ASSLÄNDER, Lorenz, Georg HETTICH, Thomas MERGNER, 2015. Visual contribution to human standing balance during support surface tilts. In: Human movement science. 2015, 41, pp. 147-164. ISSN 0167-9457. eISSN 1872-7646. Available under: doi: 10.1016/j.humov.2015.02.010

BibTex

@article{Asslander2015Visua-35036,
  year={2015},
  doi={10.1016/j.humov.2015.02.010},
  title={Visual contribution to human standing balance during support surface tilts},
  volume={41},
  issn={0167-9457},
  journal={Human movement science},
  pages={147--164},
  author={Assländer, Lorenz and Hettich, Georg and Mergner, Thomas}
}

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