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드롭 착지 시 탄소나노튜브 소재의 인솔 착용이 하지의 합성 관절 모멘트 및 근활성도에 미치는 영향
채원식 ( Woen Sik Chae ),정재후 ( Jae Hu Jung ) 한국스포츠정책과학원(구 한국스포츠개발원) 2015 체육과학연구 Vol.26 No.3
본 연구의 목적은 드롭 착지동작 시 탄소나노튜브 소재의 충격흡수 인솔 착용에 따른 하지의 합성 관절 모멘트 및 근활성도를 분석하는데 있다. 본 연구를 위해 하지 근골격계에 이상이 없는 20대 남성 10명을 연구대상자로 선정하였다. 2대의 디지털 캠코더와 1대의 지면반력기를 사용하여 드롭 착지동작 시 탄소나노튜브(CNT) 소재의 인솔과 EVA 소재의 인솔 착용에 따른 3차원 동작분석과 합성 관절 모멘트를 산출하였으며, 5개의 표면전극을 우측 하지 근육에 부착하여 근활성도 분석을 실시하였다. 착용된 인솔의 종류에 따른 운동역학적 변인들의 통계적 유의차를 검증하기 위해 paired t-test를 실시하였으며, 유의성 수준은 p<.05 로 설정하였다. 본 연구의 결과, 모든 합성 관절 모멘트에서는 인솔 착용에 따른 통계적 유의차가 나타나지 않았지만, 무릎관절의 신전근 모멘트에서 CNT 인솔 착용 조건이 EVA 인솔 착용 조건에 비해 상대적으로 감소한 것으로 나타났다. 평균 및 최대 적분근전도에서는 두 조건 간 통계적 유의차가 나타나지 않았지만, 대퇴이두근을 제외한 모든 근육에서 CNT 인솔 착용 조건이 EVA 인솔 착용 조건에 비해 상대적으로 근육 활성이 감소한 것으로 나타났다. 이러한 결과는 CNT 소재의 인솔 착용이 착지동작 시 무릎관절의 굴곡 동작을 적절히 제어하고, 발생되는 충격력을 감소시키는데 긍정적인 효과를 발생시키는 것으로 판단된다. The purpose of this study was to investigate effects of carbon nanotube-based insole on the resultant joint moment and muscle activity of the lower extremity during drop landing. Ten males with no known musculoskeltal disorders were recruited as the subjects. Two digital camcorders and one force plate were used to obtain 3-D kinematics and kinetics of the lower extremity. To assess the myoelectric activities of selected muscles, five surface electrodes were attached to the right side of the lower extremity. For each dependent variable, paired t-test was performed to test if significant difference existed between with carbon nanotube-based insole(CNT) and ethylene vinyl acetate-based insole(EVA) conditions(p<.05). The results showed that average and peak IEMG values from RF, TA, MG, and LG in CNT were lower than corresponding values in EVA. Although no significant difference in resultant joint moment was found between two conditions, a decrease in the knee extension moment was found with CNT. This indicates that wearing carbon nanotube-based insole may help to decrease impact force and to control excessive flexion movement of the knee joint during landing.
축구 인스텝 킥 시 상지의 이용 유무가 하지의 운동학적 변인에 미치는 영향
채원식 ( Woen Sik Chae ),강년주 ( Nyeon Ju Kang ),김종우 ( Jong Woo Kim ),윤창진 ( Chang Jin Yun ),채수덕 ( Su Duk Chae ),석창혁 ( Chang Huk Seok ),박기용 ( Gi Yong Park ),임영태 ( Young Tae Lim ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.1
The purpose of this study was to evaluate the kinematic effect of upper extremity usage for the scoccer instep kick motion. Ten male university students were recruited as the subjects. Temporal parameters, ball velocity, velocity of CG, angle of segment, angular velocity, and trunk orientation angle were determined for each trial. The results showed that temporal parameters in WU and WORU were significantly less than those found in WOU during pre impact phase. These indicated that no usage of upper extremity may increase excessive setup time in order to improve the accuracy of instep kick. Angle of right knee in WOU at LC was significantly greater than corresponding value for WU since angular momentum contributions of the lower limb were not effectively balanced by contributions of the upper limb. We found that the lower extremity movement was controlled by lateral movement in the trunk as a result of no usage of the upper extremity, resulting in the relatively greater trunk rotation in WOU.
내림 경사로 보행시 배낭 무게에 따른 하지 움직임의 운동역학적 분석
채원식 ( Woen Sik Chae ),이행섭 ( Haeng Seob Lee ),정재후 ( Jae Hu Jung ),김동수 ( Dong Soo Kim ) 한국운동역학회 2015 한국운동역학회지 Vol.25 No.2
Objective: The purpose of this study was to conduct biomechanical analysis of varying backpack loads on the lower limb movements during downhill walking over -20° ramp. Method: Thirteen male university students (age: 23.5±2.1 yrs, height: 175.7±4.6 cm, weight: 651.9±55.5 N) who have no musculoskeletal disorder were recruited as the subjects. Each subject walked over 20° ramp with four different backpack weights (0%, 10%, 20% and 30% of body weight) in random order at a speed of 1.0±0.1 m/s. Five digital camcorders and two force plates were used to obtain 3-d data and kinetics of the lower extremity. For each trial being analyzed, five critical instants were identified from the video recordings. Ground reaction force, loading rate, decay rate, and resultant joint moment of the ankle and the knee were determined by the inverse dynamics analysis. For each dependent variable, one-way ANOVA with repeated measures was used to determine whether there were significant differences among four different backpack weight conditions ( p<.05). When a significant difference was found, post hoc analyses were performed using the contrast procedure. Results: The results of this study showed that the medio-lateral GRFs at RHC in 20% and 30% body weight were significantly greater than the corresponding value in 0% of body weight. A consistent increase in the vertical GRFs as backpack loads increased was observed. The valgus joint movement of the knee at RTO in 30% body weight was significantly greater than the corresponding values in 0% and 10% body weight. The increased valgus moment of 30% body weight observed in this phase was associated with decelerating and stabilizing effects on the knee joint. The results also showed that the extension and valgus joint moments of the knee were systematically affected by the backpack load during downhill walking. Conclusion: Since downhill walking while carrying heavy external loads in a backpack may lead to excessive knee joint moment, damage can occur to the joint structures such as joint capsule and ligaments. Therefore, excessive repetitions of downhill walking should be avoided if the lower extremity is subjected to abnormally high levels of load over an extended period of time.
2011 대구 세계육상선수권 대회에 참가한 한국 남자 창던지기 선수와 입상자들의 3차원 운동학적 비교 분석
채원식 ( Woen Sik Chae ),윤창진 ( Chang Jin Yoon ),임영태 ( Young Tae Kim ),이행섭 ( Haeng Seob Lee ),김동수 ( Dong Soo Kim ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The purpose of this study was to compare selected kinematic variables between male medalists and a Korean male javelin thrower at the IAAF World Championships, Daegu 2011. The three medalists and one Korean javelin thrower that participated in the Championships were videotaped using three high-speed cameras (300 frames/s, EX-F1 Exilim, Casio, Japan), The results showed that the release and attitude angles of the Korean male javelin thrower (KMJT) were greater than that of the medalists, whereas the attack angle of the KMJT was smaller than that of the medalists. This study also found that the KMJT clearly had a lower release height than the medalists. As a possible adaptation of his physique to the skill, the KMJT used a small trunk inclination angle and produced greater inclination angles at his upper extremities. These results may be linked to an increase in the release angle of the KMJT. There were some difference between the KMJT and the medalists in terms of the length and duration of the delivery phase. In harmony with the shorter length of the delivery phase, its duration was shorter for the KMJT in comparison to the medalists. Because the delivery stride is considered to be a primary generator of endpoint speed, this decrease in the delivery phase time would decrease the javelin velocity at release. The amount of time taken in the delivery phase may be a critical factor to enhance a javelin thrower`s performance. Thus, rhythmic movement training specifically designed for the KMJT will help him attain an optimal throwing position.
탄소나노튜브 인솔 착용에 따른 드롭 착지 동작의 생체역학적 분석
채원식 ( Woen Sik Chae ),정재후 ( Jae Hu Jung ),이행섭 ( Haeng Seob Lee ) 한국운동역학회 2012 한국운동역학회지 Vol.22 No.4
The purpose of this study was to determine the biomechanical effect of wearing carbon nanotube-based insole on cushioning and muscle tuning during drop landing. Twenty male university students(age: 21.2±1.5 yrs, height: 175.4±4.7 cm, weight: 70.2±5.8 kg) who have no musculoskeletal disorder were recruited as the subjects. Average axial strain, average shear strain, inversion angle, linear velocity, angular velocity, vertical GRF and loading rate were determined for each trial. For each dependent variable, a one-way analysis of variance(ANOVA) with repeated measures was performed to test if significant difference existed among different three conditions(p<.05). The results showed that Average axial strain of line 4 was significantly less in CNT compared with EVA and PU during IP phase. The average shear strain was less in CNT compared with EVA and PU during other phases. The inversion angle was increased in CNT compared with EVA and PU during all phase. In linear velocity, angular velocity, vertical GRF and loading rate, there were no significant difference between the three groups. This result seems that fine particle of carbon nanotube couldn`t make geometric form which can absolve impact force by increasing density through eliminating voids of forms, Thus, searching for methods that keep voids of forms may play a pivotal role in developing of insole. This has led to suggestions the need for further biomechanical analysis to these factors.
드롭 착지동작 시 마우스가드 착용이 운동역학적 변인에 미치는 영향
채원식 ( Woen Sik Chae ),이규복 ( Kyu Bok Lee ),정재광 ( Jae Kwang Jung ),이행섭 ( Haeng Seob Lee ),김동수 ( Dong Soo Kim ),정재후 ( Jae Hu Jung ) 한국운동역학회 2013 한국운동역학회지 Vol.23 No.4
The purpose of this study was to determine the biomechanical effect of wearing the mouthguard on the lower limb during drop landing. Nine male university students who have no musculoskeletal disorder were recruited as the subjects. Linear velocity, angular velocity, vertical GRF, loading rate, joint moment, and lower extremity muscle activity were determined for each subject. For each dependent variable, paired t-test was performed to test if significant difference existed between with mouthguard (WM) and without mouthguard (WOM) conditions (p<.05). The results showed that linear velocity, angular velocity, vertical GRF and loading rate were no significant difference between the two groups. The inversion moment of the ankle joint was increased in WM compared to WOM. Average IEMG values from BF, TA, and LG in WM were significantly greater than corresponding values in WOM during IP phase. This indicates that wearing mouthguard played a vital role in muscle tuning for maintaining joint stability of the lower limb and preventing injury.
골프 드라이브 스윙 시 압축 밴드를 적용한 기능성 의류가 신체의 운동역학적 변인에 미치는 영향
채원식 ( Woen Sik Chae ),강년주 ( Nyeon Ju Kang ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.3
The purpose of this study was to determine how spandex wear with compressive band affects biomechanical parameters during a golf swing. Nine male golf players, each with at least 6 years golf experienc(handy 4.5±5.4), were recruited as the participants. Eight pairs of surface electrodes were attached to the left and right side of the body to monitor the pectoralis major(PM), external abdominal oblique(AO), erector spinae(ES), and vastus lateralis(VL). This study showed that the angular velocity of the club in EG were increased during the down swing phase but X-Factor and X-factor Stretch were reduced. Average and maximum nEMG (normalized EMG) values of the left AO(external abdominal oblique) were less in EG(experimental group) compared with CG(control group) during the back swing, whereas those of left PM(pectoralis major) in EG were greater than CG. It is more likely that EG performed effectively golf swing without excess muscle activity. Thus, the spandex wear with compressive band played an important role in improving swing performance with injury prevention. This has led to suggestions of the need for further kinetic and kinematic analyses to evaluate its function.