http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
드롭 착지 시 스포츠 테이핑이 하지의 충격력과 근육 조율에 미치는 영향
강년주 ( Nyeon Ju Kang ),채원식 ( Woen Sik Chae ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.2
The purpose of this study was to evaluate the biomechanical effect of sports taping on the lower limb during drop landing. Twelve male university students who have no musculoskeletal disorder were recruited as the subjects. Principal strain, median frequency, vertical GRF, loading rate, angular velocity and resultant joint moment were determined for each trial. For each dependent variable, paired t-test was performed to test if significant difference existed between taped and untaped conditions(p<.05). The results showed that principal strain of the thigh and the shank in taping group were significantly less than those found in control group. These indicated that sports taping may prevent excessive mechanical strain caused by impact force during the deceleration phase. Flexion(-)-extension(+) and varus(-)-valgus(+) resultant joint moment of the knee joint in taping group were greater than corresponding value for control group. It seems that extensor muscle of the knee joint were not only supported by sports taping during knee flexion but also sports taping is effective for minimizing the possibility of injury.
류종우(Jong Woo Ryu),강년주(Nyeon Ju Kang),김수혁(Soo Hyuk Kim),신영호(Young Ho Shin),강호율(Ho Youl Kang),곽혜은(Hye Eun Kwak) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.48
This study was to determine how the angular velocity affects muscle activity during the knee joint isokinetic contraction. Twelve male university students were recruited as the subjects. Four pairs of surface electrodes were attached to the right-hand side of the body to monitor the rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF). Subjects performed the knee joint isokinetic contraction for 3 minutes in each angular velocity (30 °/sec, 120 °/sec, 240 °/sec). In each angular velocity, the peak torque of a knee joint extensor muscle according to the angular velocity to the exercise duration decreased more significantly in the angular velocity 240 °/sec than in the 30 °/sec and 120 °/sec in each exercise duration and also decreased more significantly in the velocity 120 °/sec than in the 30 °/sec in two min. and three. The average torque of a knee joint extensor muscle in the 240 °/sec decreased more significantly in two min. and three than at the first time check. In the velocity 120 °/sec and 240 °/sec, the peak and average torque of a knee joint flexor muscle according to the exercise duration decreased more significantly in all exercise duration than at the first time check. When it comes to the change of the muscle activity according to the angular velocity, the peak IEMG (Integrated electromyography) of the RF, VL, VM, and BF decreased as the angular velocity increased, whereas the average IEMG increased with the angular velocity increasing. In the angular velocity 240 °/sec, the average torque of the extensor muscle significantly decreased, whereas the average IEMG of RF and VM significantly increased. During the constant velocity movement, the increase of the angular velocity makes the average IEMG increase. During the high velocity movement, the torque decreased while the average IEMG of RF and VM increased.
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.
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.
에르고미터 운동 시 근활성도와 생리학적 피로도 비교 분석
윤창진 ( Chang Jin Yoon ),채원식 ( Woen Sik Chae ),강년주 ( Nyeon Ju Kang ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.3
The purpose of this study was (a)to compare electromyographic (EMG) activities and physiological variables on the development of fatigue induced by ergometer test, (b)to determine investigate the differences in the stage of fatigue between the electromyographic characteristics and physiological variables. Nine male university students who have no musculoskeletal disorder were recruited as the subjects. The electromyographic characteristics(peak IEMG, average IEMG, median frequency, mean edge frequency) and physiological variables(HR, RPE, blood lactate) were determined for each stage(15, 30, 45, 60 minutes, all out). For each dependent variable, one-way analysis of variance(ANOVA) with repeated measures and correlation analysis were performed to test if significant difference existed(p<.05). The results showed that peak IEMG, average IEMG from low extremity and physiological variables were significantly increased during the all-out stage. EMG parameters in VL, VM show significantly correlation with physiological variables during whole stages. This indicated that IEMG values may be proper parameters to determine muscle fatigue rather than physiological variables.
하지 근력의 좌우 비대칭성이 초등학생의 보행 동적안정성에 미치는 영향
김건수 ( Gun Soo Kim ),채원식 ( Woen Sik Chae ),윤창진 ( Chang Jin Yoon ),이행섭 ( Haeng Seob Lee ),강년주 ( Nyeon Ju Kang ),김동수 ( Dong Soo Kim ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.3
The purpose of this study was to evaluate the effect of asymmetric muscle force in lower extremity on dynamic balance during walking. Sixteen elementary students(age: 12.3±0.7 yrs, height: 149.4±9.7 cm, weight 40.6±7.8 kg) who have no musculoskeletal disorder were recruited as the subjects. Temporal parameters, M-L inclination angle of XCoM-CoP, M-L and A-P CoP, loading rate, and decay rate were determined for each trial. For each dependent variable, a independent-sample t-test was performed to test if significant difference existed between each conditions(p<.05). The displacement of antero-posterior COP during RTO-LHC1 in SG was siginificantly smaller than corresponding value in AG. In contrast, the displacement of medio-lateral COP during RTO-LHC1 in SG was greater than those of AG. It seems that imbalance of muscle force may result in increasing the medio-lateral stance in order to minimize the instability. We found that the asymmetric muscle force in the lower extremity may be a reason for the awkward control of impact force.