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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.
퍼팅 시 프로와 아마추어, 초보 골퍼사이의 운동학적 변인과 그립 악력 비교
최진승 ( Jin Seung Choi ),김형식 ( Hyung Sik Kim ),강동원 ( Dong Won Kang ),김한수 ( Han Su Kim ),오호상 ( Ho Sang Oh ),서정우 ( Jeong Woo Seo ),이정한 ( Jeong Han Yi ),임영태 ( Young Tae Lim ),탁계래 ( Gye Rae Tack ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.4
The purpose of this study was to compare the differences in kinematic variables and grip forces among professionals(PG), amateurs(AG), and novice group(NG) during golf putting. The participants consisted of 3 groups based on their playing ability: 8 professional golfers (handicap<5), 8 amateurs (handicap<18) and 8 novice. Each subject attempted 2.1m putts from the hole. 3D motion analysis system(Motion analysis Corp., USA) with 6 high speed cameras and grip force measurement system(Kim et al.,2007) were used to acquired kinematic and force data, respectively. To compare differences among groups, joint angles of upper limbs, trajectory and smoothness by jerk cost function(JC) of putter head and grip forces were used in this study. Results showed that there were significant differences among groups in most of variables such as joint angles, trajectory & smoothness of putter head, and distribution of grip force in both hands. In brief, we confirmed that putting stroke in PG was more accurate and smooth than that in other groups, especially NG, due to their well-controlled upper limbs and keeping grip forces constant in both hands. It can be concluded that due to skilled levels, fundamental differences of putting movement could be identified and these differences might be helpful for improving one`s putting skills.
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.
젊은 성인의 평지 및 트레드밀 보행 시 Stride Time의 변화성
최진승 ( Jin Seung Choi ),강동원 ( Dong Won Kang ),방윤환 ( Yun Hwan Bang ),강민성 ( Min Sung Kang ),탁계래 ( Gye Rae Tack ) 한국스포츠정책과학원(구 한국스포츠개발원) 2011 체육과학연구 Vol.22 No.1
이 연구의 목적은 평지와 두 가지 조건의 트레드밀 보행 시 보행 변화성의 영향을 살펴보는 것이다. 근골격계 이상이 없는 9명(24.6±1.1 year, 175.2±4.8 cm, 68.4±6.5 kg, right-handed)이 실험에 참여하였다. 모든 피험자는 평지 (overground walking, OW), 일반적으로 속도가 고정된 트레드밀(FT), 자동적으로 보행자의 걷는 속도와 트레드밀의 속도를 맞춰주는 속도 자동 적응형 트레드밀 (AT)에서 각 10분씩 보행을 수행하였다. stride time을 이용하여, 평균 stride time, 분산계수(coefficient of variance, CV) DFA(detrended Fluctuation Analysis)를 구하여 분석하였다. 분산계수는 변화의 크기를 정량적으로 나타내며, DFA는 변화의 구조, 즉 자기유사성을 나타낸다. 그 결과, OW와 AT조건보다 FT조건의 CV가 통계적으로 유의하게 작았고, DFA는 OW조건에서 다른 조건에 비해 작은 값을 보였다. 따라서, 보행 변화성에 대한 연구자의 관심 영역이 보행 변화성의 크기 또는 구조적인 것인가에 따라 적절한 보행 실험조건의 선택이 필요하다. The purpose of this study is to evaluate an effects on gait variability by overground and two kinds of treadmill walking. Nine male subjects (24.6±1.1 year, 175.2±4.8 cm, 68.4±6.5 kg, right-handed) with no neuromuscular disease were participated for this experiment. All subjects walked at the preferred (self-selected) walking speed for 10 minutes on three walking conditions: overground (OW), traditional treadmill by fixed speed (FT) and treadmill whose speed adjusted automatically by subject`s walking speed (AT). Using stride time, average stride time, Coefficient of variance (CV) which quantifies the amount of variability and Detrended Fluctuation Analysis (DFA) which explains the structure (i.e. self-similarity) of the variability were used for analysis. The results revealed that FT condition was a smaller than OW and AT condition in CV of stride time, while in DFA of stride time, OW condition was a smaller than the other conditions. Therefore, it is necessary to select for suitable walking condition of overground or 2 types of treadmill depends on what interest researcher do: such as amount or structure of gait variability.
사이클 안장 높이 증가가 대퇴 외측광근과 대퇴이두근의 길이 및 활성화 패턴에 미치는 영향
최진승 ( Jin Seung Choi ),강동원 ( Dong Wan Kang ),서정우 ( Jeong Woo Seo ),배재혁 ( Jae Hyuk Bae ),탁계래 ( Gye Rae Tack ) 한국운동역학회 2012 한국운동역학회지 Vol.22 No.4
The purpose of this study was to investigate the effects of increased saddle height on the length and activity pattern of vastus lateralis (VL) and biceps femoris (BF) muscle. To compare the effects of increased saddle height, Preferred (self-selected height of subject) and High saddle height (approximately 5 % higher saddle height than self-selected) were used. Seven elite cyclists (career: 16.1±8.5 years) participated in 3 min. sub-maximal pedaling tests under the same cadence (90 RPM) and pedaling power (150 W). Hip and knee joint angles, and the length and activity of VL and BF were compared by measuring 3D motion and electromyography (EMG) data. Results showed that there were significant differences in peak extension timing of the hip joint angle and the range of motion of the hip and knee join between different saddle heights. Although there were significant differences in muscle length of both muscles with increasing saddle height, the timing and amount of muscle activity differed only at the CF. These findings suggest that the timing and amount of bi-articular muscle activity (i.e. BF) can be altered by changing the saddle height. For practically applying these results, further study is necessary to evaluate the effects of various cadence and the pedaling power with various saddle heights.
20대 남성의 낮은 조도의 평지 보행 시 보행 패턴 변화
최진승 ( Jin Seung Choi ),강동원 ( Dong Won Kang ),방윤환 ( Yun Hwan Bang ),탁계래 ( Gye Rae Tack ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.4
This study examined the changes in the walking pattern during level walking under low illumination conditions. Fourteen male subjects (22.1±2.21 years, 174±3.74 cm, 68.86±10.81 kg) with normal vision and no disabilities were enrolled in this study. All experiments were performed on a level walkway with three conditions: normal walking (preferred & low speed) and walking with low illumination. 3D motion capturing system was used for acquisition and analysis of the walking motion data with a sampling frequency of 120Hz. The walking speed, normalized jerk(NJ) at the center of mass(COM), wrist and heel, knee and elbow joint angle, ratio of the knee joint angle to elbow joint angle and the toe clearance on stance phase were used to compare the differences in walking pattern between the two illumination conditions, The results showed that the walking speed and joint angles decreased in low illumination, whereas the NJ and toe minimum clearance increased. In low illumination, most variables were similar to effects of low speed walking, but toe clearance was different from the effects of low speed. These results can be used as primary data for examining the changes in the level walking pattern of young adults under low illumination. Further study will be needed to compare these results in young adults with those in the elderly.
고령자와 젊은 성인의 선호속도보행 시 보행리듬 제한에 따른 보행 패턴의 변화: 기초연구
최진승(Choi, Jin-Seung) 한국사회체육학회 2021 한국사회체육학회지 Vol.- No.84
Purpose: The purpose of this study is to compare the age-specific changes according to the gait rhythm restriction using a metronome when walking at a preferred speed for older and young adults. Method: Twenty-nine healthy young adults (age: 22.8±2 years old, 15 males & 14 females) and 24 elderly people (age: 76.5±1 years old, 11 males & 13 females, BBS score: 54.3±1) participated in the experiment. The gait experiment was configured to walk twice pre subject at a preferred speed for 6 minutes in a 50m long corridor. The gait consisted of two conditions: walking at the preferred speed (PWS) and walking at the preferred speed with metronome rhythm(PWS+met). For the analysis, 19 variables composed of 4 categories (7 spatiotemporal variables, 3 lower limb movement variables, 6 upper body movement variables, and 3 turning variables) were used. An inertial sensor system was used to measure the gait variables. Repeated measures ANOVA were performed to compare gait variables by age according to gait conditions. The significant level of hypothesis verification is set up as α =.05. Results: There was a difference in all gait categories compared between healthy older and young adults when walking at the preferred speed (p<.05). However, in the within-group comparison according to the gait rhythm restriction, there were significantly statistical differences in the time variable and the turning variable categories during metronomic walking in the case of young adults p(<.05), while there were significant differences in the spatial variable and lower limb movement categories in the case of the elderly (p<.05). Conclusion: In summary, this study provides basic data that can confirm gait adaptation patterns by age when walking using a simple cognitive-motor dual task such as a metronome.
최대 및 최대하 페달링 시 무릎각도법을 이용한 사이클 안장높이 결정에 대한 기초연구
최진승(Jin Seung Choi),배재혁(Jae Hyuk Bae),강동원(Dong Won Kang),신윤호(Yoon Ho Shin),이주학(Joo Hack Lee),탁계래(Gye Rae Tack) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.53
The purpose of this study was to identify the applicability of the knee angle method during submaximal (SUB) and maximal (MAX) pedaling, and to compare with the movement of hip and ankle joint. Six cyclists(age: 34.6±5.6years, height: 174.2±5.7cm, weight: 84.8±7.6kg, career: 15.8±9.2years) participated in this experiment. 3D motion analysis system was used to acquire the movement of lower limb. Using these motion data, hip, knee and ankle joint angle were calculated. To compare SUB and MAX pedaling pattern, knee joint angle, minimum angle and range of motion (ROM) of each joint were used. Result showed that the knee angle method can be applied regardless of changes of cadence, in other words, both knee angles were in the range from 25° to 35° suggested by knee angle method. There were significant differences in the timing of minimum ankle joint of MAX and those of SUB, but those were not directly related to the changes of the knee joint angle. To clarify those causes, it is necessary to perform further study using ankle strategy for improving pedaling and preventing injury.