Background: At present time, smartphones have become very popular and powerful devices, and smartphone applications with the good validity have been designed to assess human balance ability.
Objects: The purpose of this study is to evaluate the feasibility of smartphone acceleration in the assessment of postural control ability for six different conditions.
Methods: Twenty healthy college-aged individuals volunteered. Static balance ability was measured twice with one-day interval using smartphone application and 3D motion capture system under the six different conditions.
Results: Dominant frequencies for each test condition did not show significant differences except for two conditions. The intra-rater correlation coefficient between the first and second tests showed high correlations in six conditions(r>.70, p<.05). Smartphone acceleration and the acceleration calculated from the 3D marker position data showed high correlation coefficient(r>.80, p<.001).
Conclusion: Acceleration recorded from a smartphone could be useful assessment variables for balance test in the clinical field.

Abstract
 Ⅰ. 서론
 Ⅱ. 연구방법
  1. 연구대상자
  2. 실험장비 및 도구
  3. 실험방법
  4. 분석 방법
 Ⅲ. 결과
  1. 측정자내 신뢰도
  2. 동시 타당도
  3. 가속도 신호의 중심 주파수
 Ⅴ. 결론
 References

• 황지선(호서대학교 일반대학원 물리치료학과) | Jisun Hwang (Department of Physical Therapy, Graduate School of Hoseo University)
• 황선홍(호서대학교 생명보건대학 물리치료학과, 호서대학교 기초과학연구소) | Seonhong Hwang (Department of Physical Therapy and Basic Science Institute, Hoseo University) Corresponding author