Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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A Study on Stride-to-stride Variability by Treadmill Walking

트레드밀을 이용한 보행간 Variability 분석에 관한 연구

  • Choi, Jin-Seung (Konkuk University, Research Institute of Biomedical Engineering) ;
  • Kang, Dong-Won (Konkuk University, Research Institute of Biomedical Engineering) ;
  • Tack, Gye-Rae (Konkuk University, Research Institute of Biomedical Engineeing)
  • 최진승 (건국대학교, 의공학실용기술연구소) ;
  • 강동원 (건국대학교, 의공학실용기술연구소) ;
  • 탁계래 (건국대학교, 의공학실용기술연구소)
  • Published : 2007.12.31
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Abstract

The purpose of this study was to investigate the difference in the stride-to-stride variability between two treadmill conditions; traditional treadmill and special treadmill whose speed can be adjusted automatically by subject's walking speed. Eight male subjects (25.1 years, 172.7 cm, 66.6 kg) were participated in treadmill walking experiment. First, preferred walking speed (PWS) of each subject was determined. Second, each subject performed walking experiment with fixed PWS condition and with free PWS condition for 10 minutes. 3D motion capture system (Motion analysis Corp., USA) with 6 cameras was used to collect motion data with sampling frequency of 120Hz. Temporal and spatial variables for stride-to-stride variability were calculated. Coefficient of variance (CV) which quantifies the amount of variability and Detrended Fluctuation Analysis (DFA) which explains the structure (self-similarity) of the variability were used for analysis. Results showed that the amount of variability during free PWS condition was greater than that of fixed PWS condition. DFA results showed that there was a statistical difference between two treadmill conditions for the variables of step length, stance time, and double support time. From these results, it is possible that traditional treadmill study might give incorrect conclusion about gait variability study. Further study is necessary to clarify these matters by considering the number of subjects, experimental time, and gait variables for the study of stride-to-stride variability.

Keywords

References

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