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Träfflista för sökning "(WFRF:(Johansson Mikael)) pers:(Magnusson Måns) srt2:(2000-2004)"

Sökning: (WFRF:(Johansson Mikael)) pers:(Magnusson Måns) > (2000-2004)

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1.
  • Fransson, Per-Anders, et al. (författare)
  • Postural Control Adaptation during Galvanic Vestibular and Vibratory Proprioceptive Stimulation
  • 2003
  • Ingår i: IEEE Transactions on Biomedical Engineering. - 1558-2531. ; 50:12, s. 1310-1319
  • Tidskriftsartikel (refereegranskat)abstract
    • he objective for this study was to investigate whether the adaptation of postural control was similar during galvanic vestibular stimulation and during vibratory proprioceptivestimulation of the calf muscles. Healthy subjects were tested during erect stance with eyes open or closed. An analysis method designed to consider the adaptive adjustments was used to evaluate the motion dynamics and the evoked changes of posture and stimulation response.Galvanic vestibular stimulation induced primarily lateral body movements and vibratory proprioceptive stimulation induced anteroposterior movements. The lateral body sway generated by the galvanic stimulation was proportionally smaller and contained more high-frequency movements (0.1 Hz) than the anteroposterior body sway induced by the vibratory stimulation. The adaptive adjustments of the body sway to the stimulation had similar time course and magnitude during galvanic and vibratory stimulation. The perturbations induced by stimulation were gradually reduced within the same time range (15–20 s) and both kinds of stimulation induced a body leaning whose direction was dependent on stimulus. The similarities in the adjustmentpatterns suggest that postural control operates in the same way independent of the receptor systems affected by the disturbance and irrespective of whether the motion responses were induced in a lateral or anteroposterior direction.
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2.
  • Johansson, Rolf, et al. (författare)
  • Multi-Stimulus Multi-Response Posturography
  • 2001
  • Ingår i: Mathematical Biosciences. - 0025-5564. ; 174:1, s. 41-59
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study a method for the analysis of simultaneous multiple measurements of kinematics and stabilizing forces related to human postural dynamics is proposed. Each subject in a group of normal subjects (n=10) was tested with eyes-open and eyes-closed with simultaneous but uncorrelated vestibular and proprioceptive stimuli in order to investigate the contributions of individual sensory feedback loops. Statistical analysis was made by means of multi-input multi-output identification of a transfer function from stimuli to stabilizing forces of the feet and the resulting body position, the transfer function being compatible with a biomechanical model formulated as a stabilized segmented inverted pendulum subject to feedback of body sway and position. Each individual model estimated is effective in predicting a subject's response to new stimuli and in describing the interacting effects of stimuli on body kinetics. The proposed methodology responds to the current needs of data analysis of multi-stimulus multi-response experiments.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
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refereegranskat (2)
Författare/redaktör
Johansson, Rolf (2)
Fransson, Per-Anders (2)
Magnusson, Måns (2)
Karlberg, Mikael (2)
Hafström, Anna (1)
Tjäder, Annika (1)
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Lunds universitet (2)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
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