확률공명을 활용한 진동자극이 노인의 정적 자세조절 능력에 미치는 영향
The influence of vibratory stimulus using stochastic resonance on static posture control ability of senior adults
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초록
[목적] 본 연구의 목적은 신체적으로 건강한 8명의 노인을 대상으로 확률공명을 활용한 진동자극이 정적 자세 조절에 어떠한 영향을 주는지 살펴보는 것이다. [방법] 이러한 연구목적을 달성하기 위해 피험자들은 두 가지 정적자세조절 과제에 참여하였다. 과제1은 양발을 지면에 붙인 안정적인 정적 자세조절 과제이며, 과제 2는 주로사용하지 않는 한쪽 발을 들고 자세를 유지하는 불안정적인 정적 자세조절 과제를 수행하였다. 이때 발바닥에 제공되는 진동자극은 역치이하 80%, 90%, 역치강도, 역치이상 110%, 120%의 자극을 제공하였다. [결과] 연구결과를 살펴보면 다음과 같다. 첫째, 과제 1에서는 진동자극 강도에 관계없이 안정적인 자세조절 능력을 보이는 것으로 나타났다. 둘째, 과제 2에서 진동자극 강도에 따라 자세조절 능력에 유의한 차이가 있는 것으로 나타났다. 그리고 역치 이하의 80%와 90% 자극강도에서 자세조절의 안정성이 높은 것으로 나타났다. 셋째, 전-후 방향 안정성에 대한 결과에서도 자극강도에 따라 안정성에 유의한 차이가 있는 것으로 나타났다. [결론] 진동자극을 활용한 확률공명 기법은 양발서기 과제 보다는 외발서기 과제에서 더욱 효과적이다. 더불어, 좌우 방향 안정성은 역치 이하 강도(80%, 90%)에서 다른 자극 강도(100%, 110%, 120%)보다 안정성이 높은 것으로 나타났다.
Abstract
[Purpose] The purpose of the study was to investigate the effect of vibratory stimulus on the static postural control of 8 healty senior adults. [Methods] To achieve this goal, all subjects participated in two different kinds of static postural control tasks. Task 1 was a static postural control task, where both-legs stand on the ground. Second task was an unstable static postural control task using only single leg stance. As they maintain their balance, 6 different vibratory stimulus were provided on the sole of their feet(personal threshold 0%, 80%, 90%, 100%, 110%, 120%). [Results] The results of the study were as follows: First, there was no significant differences in postural control ability according to different types of vibrator intensity. Second, there was a significant difference in single-leg postural control ability according to vibrator intensity. Third, there was a significant difference in anterio-posterior stability according to the different types of vibrator intensity. [Conclusion] Stochastic resonance using vibratory stimulus was more effective in the single leg stance task, rather than the double leg stance task. Moreover, sub-threshold vibratory stimulus(80%, 90%) intensity were more effective than higher vibratory stimulus(100%, 110%, 120%).
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