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KMID : 1137820060270060323
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의공학회지
2006 Volume.27 No. 6 p.323 ~ p.331
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Effects of Cognitive Task on Stride Rate Variability by Walking Speeds
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Choi Jin-Seung
Yoo Ji-Hye
Kim Hyung-Shik
Chung Soon-Cheol
Yi Jeong-Han
Lee Bong-Soo
Tack Gye-Rae
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Abstract
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The purpose of this study was to investigate the effect of performing a cognitive task during treadmill walking on the stride rate variability. Ten university students(age $24.0{\pm}0.25$, height $172{\pm}3.1cm$, weight $66{\pm}5.3kg$) were participated in dual task experiments which consist of both walking alone and walking with a cognitive task. Two-back task was selected for the cognitive task since it did not have learning effect during the experimental procedure.3D motion analysis system was used to measure subject’s position data by changing walking speed with 4.8, 5.6, 6.4, 6.8, and 7.2 km/hr. Stride rate was calculated by the time between heel contact and heel contact. Accuracy rate of a cognitive task during walking, coefficient of variance, allometric scaling methods and Fano factor were used to estimated the stride rate variability. As the walking speed increased, accuracy rate decreased and the logarithmic value of Fano factor increased which showed the statistical difference. Thus it can be concluded that the gait control mechanism is distracted by the secondary attention focus which is the cognitive task ie. two-back task. Further study is needed to clarify this by increasing the number of subject and experiment time.
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KEYWORD
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attention focus, walking speed, cognitive task, fractal analysis, variability
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