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KMID : 1137820090300030247
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의공학회지
2009 Volume.30 No. 3 p.247 ~ p.254
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Effects of Plantar sole Vibration using Various Frequencies on Postural Response During Standing
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Yu Mi
Piao Yong-Jun
Kim Dong-Wook
Kim Nam-Gyun
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Abstract
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We studied the postural response induced by plantar sole vibration with various frequencies(20, 60, 100Hz) and vibration zone(the anterior and posterior foot zone) of both soles during standing. Eight healthy young adults were exposed to 15s periods of plantar sole vibration while blindfolded. Body sway(COM, center of mass), the angle of neck, trunk, hip, knee, ankle and EMG of four lower limb muscles(tibialis anterior, lateral and medial gastrocnemial, soleus muscle) were recorded during 15s plantar sole vibration using 3D motion analysis system. Simulating each zone separately resulted in spatially oriented body tilts; oppositely directed backward and forward, respectively, the amplitude of which was proportional to the vibration frequency. EMG activity of lower limb muscles also varied according to the direction of the vibration zone and linearly according to the frequency. These findings led us to consider the plantar sole vibration as useful method of postural balance control and adjustment.
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KEYWORD
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postural response, vibration, plantar sole, postural orientation, com(center of mass)
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