The Control of Postural Stability during Standing is Decreased in Stroke Patients during Active Head Rotation

  • Mitsutake Tsubasa
    Department of Rehabilitation, Shiroishi Kyoritsu Hospital, Japan Division of Cognitive Neuropsychology, Graduate School of Medicine, Saga University: 1296 Hukuta, Shiroishi, Kishima, Saga 849-1112, Japan
  • Chuda Yuji
    Department of Rehabilitation, Shiroishi Kyoritsu Hospital, Japan
  • Oka Shinichiro
    Department of Physical Therapy, School of Health Sciences at Fukuoka, International University of Health and Welfare, Japan
  • Hirata Hirokatsu
    Department of Rehabilitation, Takagi Hospital, Japan
  • Matsuo Takashi
    Department of Rehabilitation, Shiroishi Kyoritsu Hospital, Japan
  • Horikawa Etsuo
    Division of Cognitive Neuropsychology, Graduate School of Medicine, Saga University: 1296 Hukuta, Shiroishi, Kishima, Saga 849-1112, Japan

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[Purpose] The aim of this study was to evaluate the effect of active head rotation on postural control in stroke patients during standing as compared with age-matched healthy subjects. [Subjects and Methods] In total, 46 stroke patients and 37 age-matched healthy subjects were recruited for the study. A stabilometer was used to assess postural stability in participants during standing, with or without active head rotation, and with their eyes open or closed. Subjects were asked to stand on a force plate while rotating their head in the yaw plane at a frequency of 1.0 Hz. A metronome was used to maintain the head rotation frequency, and the head rotation range was maintained at a total of 70° during the postural stability examinations. [Results] The control of postural stability during standing with active head rotation was significantly decreased in the stroke group as compared with the healthy group with both the eyes open and closed. No significant differences in relation to standing without head motion were observed between groups. [Conclusion] The findings suggest that postural instability is increased in stroke patients during active head rotation, and therefore, vestibular function in relation to head rotation might be reduced in stroke patients.

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