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보행속도변화에 따른 인지 과제 수행이 보행수 변동성에 미치는 영향
최진승,유지혜,김형식,정순철,이정한,이봉수,탁계래,Choi, Jin-Seung,Yoo, Ji-Hye,Kim, Hyung-Shik,Chung, Soon-Cheol,Yi, Jeong-Han,Lee, Bong-Soo,Tack, Gye-Rae 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
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.
사이클 페달링 시 웨지를 이용한 하지 수직정렬이 무릎 궤적 및 페달링 파워, 속도에 미치는 영향
최진승(Jin Seung Choi),강동원(Dong Won Kang),배재혁(Jae Hyuk Bae),서정우(Jeong Woo Seo),탁계래(Gye Rae Tack) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.48
This paper evaluated quantitative effects of vertical alignment of leg on knee trajectory, pedaling power and speed during pedaling. In general, traditional cycle fittings consisted of optimization of frame size using cyclist`s body size (static fitting) and pedaling efficiency using vertical leg alignment (dynamic fitting) during pedaling. Though both fitting methods were adopted in this study, static fitting was used for all test conditions thus the effects of dynamic fitting were evaluated. Fifteen male subjects (height 172.9 cm, weight 65.2 kg, age 25.3 years) were participated in this study. For the comparison of pedaling performance between before and after fitting, two min. submaximal pedaling tests with constant pedaling load were conducted. Results showed that the range of motion of medio-lateral direction at the knee, which represented pedaling trajectory, and the coefficient of variance of pedaling power were decreased significantly. From these results, it is believed that dynamic fitting showed positive effects such as increased pedalling kinematic stability and kinetic efficiency. Further study is necessary to evaluate the effects of the dynamic fitting through enough subjects with considering pedaling force and muscle activation.
최진승(Jin Seung Choi),강동원(Dong Won Kang),탁계래(Gye Rae Tack) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.45
The purpose of this study was to investigate determinants of preferred walking speed(PWS) by comparing three methods for measuring PWS. Two measured PWSs by treadmill walking and calculated PWS by Froud velocity(VF) using lower limb length were compared in this experiment. In the results, there was no difference between two measured PWSs, while there was difference between calculated PWS by VF and others. To identify discrepancy, physical characteristics(height, weight, lower limb length, joint range of motion(ROM), joint torque) and personality by JAS questionaire were measured and compared. There were significant differences at lower limb length (r=.695, p=.024), hip joint ROM (r=-.653, p=.026), ankle joint plantar-flexion torque (r=.702, p=.041). PWS of type A personality were faster than that of type B personality(t=-2.537, p=.024). These results may be helpful to clarify various factors for determined PWS and understand the meaning of determined PWS.