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KMID : 1011420190240020153
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 2 p.153 ~ p.159
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Changes in Postural Stability with the Direction and Speed of Smooth-Pursuit Eye Movements
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Bae Ji-In
Cho Hyun-Gug
Yu Dong-Sik
Moon Byeong-Yeon
Kim Sang-Yeob
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Abstract
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Purpose: This study aimed to investigate the effect of smooth-pursuit eye movements (SPEMs) without head movement on postural stability and provide basic data for developing training or rehabilitation programs using SPEMs.
Methods: Forty subjects (24 men; 16 women) aged 23.24±2.58 years participated in this study. SPEMs were induced in the horizontal, vertical, and diagonal directions within 50° of binocular vision, and the target speed was set at three conditions (10°/s, 20°/s, and 30°/s). To analyze the change of postural stability with SPEM stimuli, postural instability and sway power were evaluated using the Tetrax biofeedback system. The measured values were compared to stationary fixation.
Results: Postural instability increased when SPEMs were induced in the horizontal, vertical, and diagonal directions
compared to stationary fixation. Further, postural instability increased with increased target speed of SPEMs in all directions. When horizontal and vertical SPEMs were induced, the sway powers of low-to-medium (peripheral nervous system) and medium-to-high (somatosensory system) frequencies increased. When diagonal SPEMs were induced, the sway powers of high (central nervous system), low-to-medium, and medium-to-high frequencies increased.
Conclusions: When SPEMs without head movement occur in the diagonal direction or with high speed, they may have a negative effect on postural stability. Therefore, programs using SPEMs should be developed with proper speed and direction settings.
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KEYWORD
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Smooth pursuit eye movements, Postural instability, Sway power, Fourier transformation analysis
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