Decreased postural adaptation in patients with phobic postural vertigo-An effect of an "anxious" control of posture?

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Decreased postural adaptation in patients with phobic postural vertigo-An effect of an "anxious" control of posture? / Tjernström, Fredrik; Fransson, Per-Anders; Holmberg, Johan; Karlberg, Mikael; Magnusson, Måns.

I: Neuroscience Letters, Vol. 454, Nr. 3, 2009, s. 198-202.

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T1 - Decreased postural adaptation in patients with phobic postural vertigo-An effect of an "anxious" control of posture?

AU - Tjernström, Fredrik

AU - Fransson, Per-Anders

AU - Holmberg, Johan

AU - Karlberg, Mikael

AU - Magnusson, Måns

PY - 2009

Y1 - 2009

N2 - Postural adaptability and responses elicited by vibratory stimulation to the calf muscles recorded on a force platform with eyes open or closed were analyzed in 39 patients suffering from Postural Phobic Vertigo (PPV) (17 men and 22 women, mean age 49 years) and 24 healthy subjects (14 men, 10 women, mean age 38 years). The vibration induced increased body sway in both groups, but the adaptation pattern differed significantly. With eyes open the PPV patients decreased their induced body sway over time (-32%, p < 0.01), which the controls did not. With eyes closed the PPV patients reduced their induced body sway over time to a much lesser extent than the controls (PPV: -28%, p < 0.05, controls: -57%, p < 0.001). These new findings show that PPV patients adapt to proprioceptive perturbation to a lesser extent than normal subjects and that PPV patients do not use visual information as efficiently to modulate postural control. The results support the hypothesis that a cognitive set of posture, an "anxious control", may underlie the symptoms of PPV, i.e. an increased readiness to react to any perturbation or deviation. (C) 2009 Elsevier Ireland Ltd. All rights reserved.

AB - Postural adaptability and responses elicited by vibratory stimulation to the calf muscles recorded on a force platform with eyes open or closed were analyzed in 39 patients suffering from Postural Phobic Vertigo (PPV) (17 men and 22 women, mean age 49 years) and 24 healthy subjects (14 men, 10 women, mean age 38 years). The vibration induced increased body sway in both groups, but the adaptation pattern differed significantly. With eyes open the PPV patients decreased their induced body sway over time (-32%, p < 0.01), which the controls did not. With eyes closed the PPV patients reduced their induced body sway over time to a much lesser extent than the controls (PPV: -28%, p < 0.05, controls: -57%, p < 0.001). These new findings show that PPV patients adapt to proprioceptive perturbation to a lesser extent than normal subjects and that PPV patients do not use visual information as efficiently to modulate postural control. The results support the hypothesis that a cognitive set of posture, an "anxious control", may underlie the symptoms of PPV, i.e. an increased readiness to react to any perturbation or deviation. (C) 2009 Elsevier Ireland Ltd. All rights reserved.

KW - Adaptation

KW - Phobic postural vertigo

KW - Posture

KW - Non-organic dizziness

U2 - 10.1016/j.neulet.2009.03.020

DO - 10.1016/j.neulet.2009.03.020

M3 - Article

C2 - 19429083

VL - 454

SP - 198

EP - 202

JO - Neuroscience Letters

JF - Neuroscience Letters

SN - 0304-3940

IS - 3

ER -