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ISSN : 1226-9654

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Vol.28 No.1

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안구운동이 파킨슨병환자들의 자세 유지에 미치는 영향

The effect of eye movements on the postural control of patients with Parkinson’s disease

한국심리학회지: 인지 및 생물 / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2016, v.28 no.1, pp.123-142
https://doi.org/10.22172/cogbio.2016.28.1.006
김남균 (계명대학교)
이호원 (경북대학교)
박상범 (계명대학교)
김남균, 이호원, & 박상범. (2016). 안구운동이 파킨슨병환자들의 자세 유지에 미치는 영향. 한국심리학회지: 인지 및 생물, 28(1), 123-142, https://doi.org/10.22172/cogbio.2016.28.1.006

초록

본 연구에서는 움직이는 물체를 추적하기 위해서 실시하는 수평안구운동이 파킨슨병환자들의 자세 유지에 영향을 미치는지를 확인하고자 시도하였다. 물체는 좌우 6°의 범위 내에서 교대로 1분간 움직였으며, 움직이는 동안 형태가 주기적으로 변화하였다. 참가자들은 화면에서 1m 떨어진 위치에서 편안히 선 자세로 움직이는 물체를 추적하면서 변화하는 형태의 수를 센 뒤 시행이 종료되었을 때 그 시행에서 나타난 물체의 수를 보고하는 과제를 수행하였다. 참가자들이 이 과제를 수행하는 동안 참가자들의 머리, 몸통 및 허리의 위치를 실시간으로 기록하였으며, 이 기록을 이용하여 각 부위의 전후 및 좌우 움직임의 평균값, 표준편차, 및 범위를 추출하였으며, 그 결과를 정상노인집단의 수치와 비교 분석하였다. 그 결과 정상대조군들은 주파수로 조절한 과제의 난이도에 전혀 영향을 받지 않은 반면, 파킨슨병환자들은 주파수의 영향을 받아 신체가 정상노인집단에 비해 큰 폭으로 불규칙하게 움직였을 뿐 아니라, 신체 부위들 또한 비동기화되어 불안정한 자세가 유도되는 것으로 나타났다. 이런 결과는 자세 유지 기능의 점진적 손상이 지각과 운동의 기능적 결합을 단절시킴으로서 자세 유지 기능이 지각과제의 부하를 더 이상 적응적으로 대처하지 못하여 발생하는 결과로 해석할 수 있다. 본 연구 결과는 불안정한 자세로 인해 낙상의 위험에 취약한 파킨슨병환자들이 고려해야할 또 다른 요소가 된다.

keywords
파킨슨병, 초자세과제, 자세 유지, 이중과제간섭, 안구운동, Parkinson's disease, Suprapostural task, postural control, dual task interference, eye movements

Abstract

The present study compared the effect of eye movements on postural control in 13 Parkinson’s disease (PD) patients (Hoehn-Yahr stage 2-3) and 13 age-matched healthy adults. Participants viewed, from a distance of 1 m, a computer display of an oscillating object that continuously changed shape and reported the number of times the shape changed over each 60 s trial. Four oscillation rates (0, 0.5, 0.8, and 1.2Hz) were presented. Postural sway data (mean position, standard deviation, and range of the excursions in the anterior-posterior and medio-lateral directions) were obtained using a wireless motion tracking system via sensors attached to each participant’s head, neck, and cervical spine. The effect of eye movement frequency on postural sway was minimal in the healthy adults, consistent with the view that postural control and suprapostural task (eye movement control) are functionally integrated to facilitate the performance of suprapostural control tasks. By contrast, PD patients’ showed greater and more variable postural sway, particularly in the anterior-posterior direction. It appears that PD patients’ impaired postural control systems are no longer integrated functionally with their eye movement control. This result suggests an additional factor to consider in PD patients who are susceptible to falls due to postural instability.

keywords
파킨슨병, 초자세과제, 자세 유지, 이중과제간섭, 안구운동, Parkinson's disease, Suprapostural task, postural control, dual task interference, eye movements

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