체성감각 정보가 자세 조절 시 자유 모멘트에 미치는 영향
Frequency Analysis Approach to Study the Effect of Somatosensory Information on Free Moment in Postural Control
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본 연구의 목적은 체성감각 정보가 자세 조절 시 횡단면 상의 회전 움직임(자유 모멘트: FM)에 미치는 영향을 규명하는 것이다. 연구 대상자는 12명의 건강한 성인 남성이었으며, 실험 과제는 눈을 감은 조건하에 체성감각 정보 제한 유무에 따라 안정된 기저면(firm)과 불안정한 기저면(foam) 조건에서 직렬 서기(tandem) 자세로 30초간 최대한 정적으로 자세를 유지하는 것이었다. 실험 과제는 2회 반복 측정하였다. 체성감각 정보의 제한은 FM과 ML 방향의 COP의 가변성을 증가시켰다. FM 주파수성분 분석 결과 체성감각 정보의 제한은 저역대(0-0.1Hz), 중역대(0.1-0.5Hz), 고역대(0.5-1Hz) 파워를 증가시켰다. COP 주파수 성분 분석 결과 체성감각 정보의 제한은 AP 방향에서 중역대, 고역대 파워를 증가시켰으며 ML 방향에서 세 주파수 대역모두 증가시켰다. FM의 주파수 성분은 저역대에서 낮은 파워, 고역대에서 높은 파워를 나타냈으며, COP는 저역대에서 높은파워, 고역대에서 낮은 파워를 나타냈다. 본 연구의 결과는 FM과 COP가 다른 특성을 가지고 있음을 보여준다. 본 연구는FM을 변인으로 하는 후속 연구에 유익한 기초자료로 사용될 수 있을 것으로 사료된다.
Abstract
The purpose of the study is to find the effect of somatosensory information on rotational movement on transversal plane(FM) during posture control. The participants were 12 healthy males. The task was to stand as stable as possible in a tandem stance for 30 seconds on firm/foam surface, with eyes closed, repeated 2 times. FM variability and COP ML variability were higher on foam surface than firm surface. Frequency analysis on FM revealed that reduced somatosensory increases the power of low(0-0.1Hz), middle(0.1-0.5Hz), and high(0.5-1Hz) frequency bands. The power of middle and high frequency bands of COP AP were increased by reduced somatosensory. The power of all three frequency bands of COP ML were increased by somatosensory reduction. FM showed low power in low frequency band, higher power in higher frequency. COP showed high power in low frequency, lower power in higher frequency. The result of the present study revealed the different characteristics between FM and COP. The study could be used as basic data for future studies with FM as a variable.
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