Earticle

Hexagonal bolt, nut, fittings, and high-pressure valves with special alloy play an important role in many industrial products, for instance, such as semiconductor facilities, hydrogen stations and fuel cell electric vehicles. The purpose of this study is to predict the reaction force of roller in drawing system. Numerical analysis was conducted to obtain data for designing the turning wheel, which is key parts in drawing system, using the reaction force of roller. As the results, the reaction force of X axis direction was about 9~20 times larger than that of Z axis direction and the reaction force of Y axis direction was negligible. The maximum reaction force of roller was the case of 4 stage and the numerical results in this study could be helped for designing the mechanical parts of variable hexagonal rolling die.

This study investigates the mechanical behavior at the compression of bonded aluminum foam. Four kinds of specimen thicknesses are 25, 50, 75 and 100mm. These aluminum foams are compressed with the speed of 5mm/min. The reaction forces in cases of 25, 50, 75 and 100mm are 2510, 5080, 7700 and 10400N respectively. The equivalent stresses are 0.96, 1.00, 1.02 and 1.03MPa respectively. These analysis results are verified by comparing with the experimental results. The results of this study can be contributed to the safe design of structure.

Objective To analyze the differences in the vertical ground reaction force (GRF) variables of hemiplegic patients compared with a control group, and between the affected and unaffected limbs of hemiplegic patients using foot scans. Methods Patients (n=20) with hemiplegia and healthy volunteers (n=20) underwent vertical force analysis. We measured the following: the first and second peak forces (F1, F2) and the percent stances at which they occurred (T1, T2); the vertical force impulse (VFI) and stance times. The GRF results were compared between the hemiplegic patients and control individuals, and between the affected and unaffected limbs of hemiplegic patients. Additionally, we analyzed the impulse of the unaffected limb according to the motor assessment scale (MAS), Brunnstrom stage, and a Timed Up and Go Test. Results The F1s and F2s of the affected and unaffected limbs were significantly less than those of the normal control individuals (p<0.05). The T1s of both the affected and unaffected limbs of the patients were greater than control individuals, whilst the T2s were lower (p<0.05). Greater impulses and stance times were recorded on both sides of the patients than in the limbs of the control individuals (p<0.05). The MAS, Brunnstrom stage and Timed Up and Go Test results were significantly correlated with the VFI of the unaffected limbs (p<0.05).Conclusion The high impulse values of the unaffected limb were associated with complications during gait rehabilitation. Therefore, these results suggest that unaffected limbs should also be taken into consideration in these patients.

Considering the occurrence of gait impairment following stroke, walk-ing recovery is an important goal of rehabilitation. Ground reaction force (GRF) is used for gait assessment of rehabilitation progress during exercise in stroke patients. The aim of this study was to compare the GRF during gait of the nonparetic side in hemiparetic patients and the dominant side in healthy subjects. Twenty hemiparetic patients and 20 healthy subjects were enrolled in the study. Force plate was used to evaluate GRF during gait. Additionally, with the patients and subjects in supine position, we measured their range of motion (ROM) in ankle dor-siflexion using a digital goniometer. The force values of stance phase on the nonparetic side of hemiparetic patients were significantly less than on the dominant side of healthy subjects (P<0.05). The impulse values of stance phase on the paretic side and the nonparetic side of hemiparetic patients were significantly greater than on the dominant side of healthy subjects (P<0.05). The ankle ROM result was signifi-cantly correlated with the GRF values (P<0.05). It is important to assess and understand the nonparetic side as well as paretic side. These re-sults suggest that the analysis of GRF for exercise rehabilitation will be a valuable clinical evaluation in hemiparetic patients after a stroke.

The previous reviewed studies on inducement of fatigue through long-time walking were not only very confined, but also not cleared on rela-tionship among variables of fatigue inducement active force, decay rate, and power. This study analyzed relationship between power and component of ground reaction force after fatigue being induced through 16-km walking. The fatigue of adult males and females (n=16) was induced through 16-km walking. Then power, measured for pre and post of fatigue inducement, was evaluated by maximal vertical jump on ground reaction force plate. Variables of vertical jump heights, active force, power, and decay rate showed decreased tendency after fatigue inducement, which followed significant difference (P<0.05) and also positive correlation of r=0.628 (R 2=39%) of between vertical jump heights and power and r=0.589 (R 2=34%) of between active force and decay rate respectively. That is, long-time walking for pursuing of exer-cise rehabilitation, health promotion and leisure activity has been pre-ferred. In the view of this, this study suggested the necessity to under-stand the relation between fatigue and power to prevent a potential possibility of injury during long-time walking.

The aim of this study is to compare and analyze the components of ground reaction force (GRF) relative to the foothold heights during downward step of 16-t truck. Adult males (n= 10) jumped downward from each 1st, 2nd, 3rd foothold step and driver’s seat orderly using hand rail. Sampling rate of force components of 3 axis (medial-lateral [ML] GRF, anterior-posterior [AP] GRF, peak vertical force [PVF]), variables (COPx, COPy, COP area) of center of pressure (COP), loading rate, and stability index (ML, AP, vertical, and dynamic postural stability index [DPSI]) processed from GRF system was cut off at 1,000 Hz. and variables was processed with repeated one-way analysis of variance. AP GRF, PVF and loading rate showed higher value in case of not used hand rail than that used hand rail in all 1st, 2nd, and 3rd of foothold step. DPSI showed more lowered stability in order of 2nd, 3rd step than 1st foothold step used with hand rail, of which showed lowest stability from driver’s seat. COPx, COPy, and COP area showed higher value in case of 2nd and 3rd than that of 1st of foothold step, and showed lowest stability from driver’s seat. It is more desirable for cargo truck driver to utilize an available hand rail in order of 3rd, 2nd, and 1st of foothold step than downward stepping directly, thus by which may results in decrease of falling injuries and minimization of impulsive force transferring to muscular-skeletal system.

This study aimed to analyze an effect on the parameters of high-heel shoe and transfer time of ground reaction force during level walking and subjects participated were composed of adult female subjects (n=13) of 20s with height of high heel (0 cm, 9 cm, respectively). Instru-ment used for the study was 1 set force plate (AMTI-OR9-7) and sam-pling rate for data collection of analysis parameters was set-up at 1,000 Hz. The revelation of required coefficient of friction (RCOF) maximum showed significant difference with more rapid than that of 1st peak ver-tical force (1 PVF). Transfer time of body weight showed significant dif-ference with more delay at 9 cm than that of 0 cm. RCOF required more frictional force required because PVF showed significant difference with larger value on 9 cm than that of 3 cm at 1 PVF. Both center of pressure (COP) x and COPy showed rather less displacement on 9 cm than that of 0 cm. In addition, level walking by high heel shoe did not control efficiently the ground reaction force due to restricted control capacity of coefficient of frictional force and therefore could suggest an inducement of muscle fatigue, heightening a possibility of sliding and falling due to decrease of frictional force.

[목적] 본 연구는 드라이버를 이용하여 볼의 방향성을 유지한 상태에서 신체 운동을 통한 클럽헤드의 속도의 증 가가 지면반력에 미치는 영향을 분석하는데 목적이 있다. [방법] Trackman과 8대의 Vicon 카메라(250Hz), 2대의 지면반력기(2000Hz)를 이용하여 남자 골프선수 5명의 드라이버스윙 동작 시 지면반력에 대한 수직력과 좌우, 전 후 그리고 클럽 헤드의 속도, 볼의 전체비거리에 평균값을 산출하였으며, SPSS ver. 22 프로그램을 사용하여 Wilcoxon signed rank test를 실시하였다(α=.05). [결과] 분석 결과 양발의 수직 지면반력을 합한 전체수직력 변화 는 E3(ED)구간에서 IS가 GS보다 높게 나왔으며 통계적으로 유의한 차이가 나타났다. 좌·우 지면반력 변화는 E2(TB), E3(ED)구간에서 lead foot이 IS가 GS보다 낮게 나왔으며 통계적으로 유의한 차이가 나타났다. 전·후 지 면반력 변화에서 Lead foot은 E2(TB), E3(ED)구간에서 IS가 GS보다 높게 나왔으며 통계적으로 유의한 차이가 나 타났다. Trail foot은 E3(ED)구간에서 IS가 GS보다 높게 나왔으며 통계적으로 유의한 차이가 나타났다. IS가 GS보 다 클럽헤드 속도와 비거리가 증가되었다. [결론] 비거리 증가를 위한 스윙 시 지면을 눌러주는 힘이 증가되었고 이는 클럽헤드 스피드와 비거리 증가에 매우 중요한 요인임을 알 수 있었다.

[Purpose] The purpose of this study was to analyze the effect of ground reaction force on increasing club head speed during driver swing. [Method] Five male professional golfers were participated. A Trackman, 8 Vicon cameras (250Hz), and two force plates (2000Hz) were used to collect the ground reactions force, and club head speed during driver swing. The Wilcoxon signed rank test was performed using the SPSS ver. 22 program and alpha set at .05. [Result] As a result, vertical ground reaction force was significantly different between IS and GS in E3(ED). Medial and lateral of lead foot ground reaction force showed that IS was lower than GS in E2(TB) and E3(ED). Anterior and posterior of lead foot ground reaction force indicated that IS was higher than GS in E2(TB) and E3(ED), and ground reaction force of trail foot was showed that IS was higher than GS in E3(ED). Finally, club head speed and distance of IS was faster than GS. [Conclusion] It was found that participants were used vertical ground reaction force more to increase club head speed. Therefore, vertical ground reaction force may be factor to increase club head speed and distance.

Hexagonal bolt, nut, fittings, and high-pressure valves with special alloy play an important role in many industrial products, for instance, such as semiconductor facilities, hydrogen stations and fuel cell electric vehicles. The purpose of this study is to investigate the structural stability of turning wheel using the reaction force of roller in variable hexagonal rolling die. As the results, the bearing groove had the possibility of damage in turning wheel, especially, in case of Bottom condition. Furthermore, the turning wheel showed structural instability by using safety factor but structural stability using strength, respectively, as a safety criterion.

[목적] 본 연구는 스탠스 유형에 따른 다운스윙 시 발목 토크 및 지면반력의 차이를 분석하는데 목적이 있다. [방법] 연구대상자는 대학 골프 선수 14명이 참여하였다. 8대의 VICON 모션 캡쳐 카메라와 2대의 지면반력기를 사용하였 다. 스탠스 유형에 따른 운동학적 및 운동역학적 변인을 수집하였다. 통계 분석은 대응 t-test를 실시하였으며, 통계 적 유의 수준은 a=.05로 설정하였다. [결과] 다운스윙 시 지면반력은 통계적으로 유의한 차이가 나타났다. 다운스윙 시 발목 관절 토크는 전·후 방향에서 통계적 유의한 차이가 나타나지 않았다. 좌·우 방향에서 발목 관절 토크는 통계적으로 유의한 차이가 나타났으나, 수직 방향에서는 통계적 유의한 차이가 나타나지 않았다. [결론] 어드레스 시 스탠스 유형에 따라 지면반력과 발목 관절 토크의 차이가 나타났다.

[Purpose] The purpose this study was to identify the difference in ankle torque and ground reaction force according to stance types during downswing. [Method] Fourteen collegiate golfers were participated. Eight motion capture cameras and two force plates were used to collect kinematic and kinetic data. It was performed paired t-test and alpha set at .05. [Result] As a results, ground reaction force was significantly difference. There was no significantly difference ankle inversion and eversion torque. The ankle flexion and extension torque was significantly difference, but internal and external rotation ankle torque was not significantly difference. [Conclusion] Therefore, ground reaction force and ankle torque were difference according to stance types at address.

초등학교 엘리트 골프선수들을 대상으로 골프 스윙시 클럽에 따른 양발의 지면반력 차이를 비교하였다. 이를 위해 골프경력 3년 이상인 남자 2명, 여자 2명 총 4명의 초등학교 엘리트 선수를 대상으로 양발의 지면반력 차이를 분석하였다. 지면반력기를 활용하여 운동학적 변인들을 분석한 후, 일반 선형 모형의 다변량 분석을 실시하였다. 연구결과, 어드레스 순간에서 숏아이언에 비해서 6번 아이언과 드라이버는 왼발이 백스윙 방향으로 힘을 가해주고 있으며, 샌드웨지의 경우 왼발의 버텨주는 힘을 더 보완해야 할 것으로 생각된다. 전후방향으로는 왼발은 앞꿈치, 오른발은 뒤꿈치쪽으로 힘을 가해주고, 수직방향으로는 숏아이언의 경우 왼발의 힘을 줄이는 반면에, 오른발을 강하게 차주는 것이 좋을 것으로 판단된다. 백스윙 정점에서는 8번 아이언은 다른 클럽에 비해서 백스윙 방향으로 힘을 덜 가해주는 것이 좋으며, 왼발보다는 오른발의 수직지면반력을 강하게 이용하는 것이 바람직할 것으로 판단된다. 샌드웨지와 6번 아이언은 드라이버와 8번 아이언과 반대로 나타났는데, 대체로 양발이 서로 반대 방향으로 힘을 가해주는 동작이 안정적인 자세 유지에 도움이 될 것으로 판단된다. 임팩트 순간에서는 드라이버의 경우, 다른 클럽보다 왼발은 공의 진행방향으로 오른발은 그 반대방향으로 힘을 가하지 않는 것이 바람직해 보인다. 또한 클럽이 짧을수록 왼발의 수직지면반력을 강하게 하고 왼발은 뒤꿈치, 오른발은 앞꿈치에 힘을 가해주는 것이 바람직해 보인다. 피니쉬 동작에서는 클럽의 길이가 길어질수록 공의 진행 방향인 왼쪽으로 힘을 가하고, 특히 드라이버의 경우 공의 진행 방향으로 힘을 더 가해주는 것이 바람직해 보인다. 미들 아이언은 왼발은 뒤꿈치, 오른발은 앞꿈치에 힘을 가하는 것이 바람직하고, 클럽이 길수록 왼발의 수직지면반력을 크게 해주는 것이 바람직해 보인다.

The elite golf players of elementary school compared the difference of ground reaction force of both feet according to the club during the golf swing. For this purpose, we analyzed with the difference of ground reaction force of both feet for four elite male and female golfers who have more than 3years of golf experience. After analyzing athletic variable using a force platform, multivariate analysis of general linear model was performed. As a result, the 6 iron and the driver are putting the left foot in the direction of the backswing in comparison with the short iron at the address moment. Sandwedge is considered to have to supplement the strength of the left foot. In the perpendicular direction, the left foot applies force to the forefoot and the right foot to the heel. In the vertical direction, the short iron reduces the power of the left foot, while it is strongly recommended that the right foot is strong. At the peak of the backswing, the 8 iron should be less forceful in the direction of the backswing than the other clubs. It is desirable to use the vertical ground reaction force of the right foot more strongly than the left foot. The sandwedge and the 6 iron appeared opposite to the driver and the 8 iron. In general, it is considered that the motion of both feet in the opposite direction will assist in maintaining a stable posture. At the moment of impact, in the case of the driver, It is better to apply the left foot to the direction of the ball than other clubs. The right foot does not seem to apply force in the opposite direction. Furthermore, the shorter the club is, the stronger the vertical force of the left side left. It is desirable to apply force to the forefoot of the right foot, and to the heel of the left foot. In finishing operation, The longer the length of the club apply a force to the left, which is the direction of the ball. Especially for the driver, it seems preferable to apply more force in the direction of the ball. Middle iron is better for the right foot applies force to the forefoot and the left foot to the heel. The longer the club is the greater the vertical ground reaction force of the left foot.

The purpose of this study was to investigate the effect of surface coefficient of restitution on vertical ground reaction force, joint angular velocity and muscle activity during landing with ankle, knee and hip joint angle limitation. 10 men were recruited as a subjects but only one person was excluded due to personal reason therefore a total of 9 men participated in this measurement. The participants were performed 30cm height drop landing on three different surface with randomized control and cross-over design. All subjects were performed four weeks drop landing to limit the joint angle during landing. Three-dimensional motion analysis equipment and surface EMG was used to measure ground reaction force, joint angles, joint angular velocity and muscle activity of lower limb. Collected data were statically analyzed by repeated one-way analysis of variance and alpha was set at .05. As a results, there were no significant difference between ground reaction force and joint angular velocity but there were significant difference in muscle activity and on wood had highest activity level than others. Based on the results of this study, further study needs to kinematic analysis and hormonal responses about a variety of surface coefficient and drop landing height followed by jump.

본 연구는 12주간 로봇 재활보행 운동이 유연성 평발 골프선수의 발 접지면과 지면발력 및 발목각도에 미치는 영향을 규명하는데 목적이 있다. 본 연구는 대한골프협회에 등록되어있는 중·고등학교 골프선수 중 유연성 평발 진단을 받은 36명을 대상으로 비운동 대조그룹(NEG, n=12), 보조기 착용 그룹(FEG, n=12), 로봇 재활보행 운동 그룹(REG, n=12)으로 무선 배정하여 운동 프로그램 전·후 발 접지면과 지면발력 및 발목각도를 측정하였다. 운동프로그램은 주 3회 1일 60분 총 12주간 실시하였다. 수집된 데이터는 SPSS 26.0 통계프로그램 이원분산분석을 통해 분석하였다. 본 연구 결과 12주간 로봇 재활보행 운동 후 유연성 평발 골프선수의 발 접지면 변화에서는 로봇 재활보행 운동 그룹이 비운동 대조그룹과 보조기 착용 그룹에 비해 발 접지면의 4방향 모두 통계적으로 유의하게 향상되었으며, 12주간 로봇 재활보행 운동 후 유연성 평발 골프선수의 지면발력의 변화에서는 로봇 재활보행 운동 그룹이 비 운동 대조그룹과 보조기 착용 그룹에 비해 지면발력의 전후·좌우 체중 비와 수직방향 충격량에서 통계적으로 유의하게 향상되었다. 또한, 12주간 로봇 재활보행 운동 후 유연성 평발 골프선수의 발목각도의 변화에서는 로봇 재활보행 운동 그룹이 비 운동 대조그룹과 보조기 착용 그룹에 비해 발목각도가 통계적으로 유의하게 향상되었다. 12주간의 로봇 재활보행 운동이 유연성 평발 골프선수의 발 접지면과 지면발력 및 발목각도에 긍정적인 효과가 나타났으며, 이는, 유연성 평발로 인한 골프선수들의 하지 움직임 요인 개선과 지면발력을 이용한 중심이동 기능향상을 나타내 골프 경기력 향상에 긍정적인 영향을 미칠 것으로 생각된다.

This study was to investigate the effects of robot gait rehabilitation training on foot contact and ground reaction force and ankle angle in flexible flat foot golfers. In order to achieve the purpose of this study, golfers at C, D and K local, were selected at random and allocated 12 golfers each for the Non Exercise group(NEG), Foot Orthotics group(FOG), Robot Rehabilitation Exercise group(REG) and measured foot contact and ground reaction force and ankle angle before and after the experiment. The robot gait rehabilitation training for 12 weeks. The results of this study were as follows: First, As a result of analyzing the change of foot contact according to robot gait rehabilitation program, REG was significantly improved compared to NEG and FOG. Second, As a result of analyzing the change of ground reaction force according to robot gait rehabilitation program, REG was significantly improved compared to NEG and FOG. Third, As a result of analyzing the change of ankle angle to robot gait rehabilitation program, REG was significantly improved compared to NEG and FOG. As conclusions, this study confirmed that the robot gait rehabilitation training on foot contact and ground reaction force and ankle angle in flexible flat foot golfers.

Recently, there are a lot of fires breaking out at special structures. To suppress this fire breakdown at early stage is very important because it leads to bigger damage in case of special structures. For early suppression, outer wall of building has to be destroyed and need waterproofing for Ignitiontemperature. So far there is no equipment developed local and all of them are imported from a broad. In this study, In this study, The CAE analysis was the Leading-in of the boom conditions for thedevelopment of demolition fire according to the environment of Korea. As a result of this, could beconfirmed that decreases stress reduction. maximum 51% to 12% depending on the part. It was possiblestructural integrity and design. about Telescopic Boom and Outrigger on the basis of this result.

[목적] 본 연구의 목적은 골프선수들이 드라이버 스윙 시 이온화된 마그네슘 섭취에 따른 신체중심이동과 지면반 력 변화를 분석하여 검증하는 것이다. [방법] 여자골프선수 14명을 이온화된 마그네슘 투여집단(AGG) 위약집단 (PG) 2집단으로 나누어 4주간 섭취하였다. 자료처리는 SPSS 22.0 프로그램으로, 이원혼합 모형(2-way mixed ANOVA)으로 분석하였다. [결과] 이온화된 마그네슘 섭취에 따른 혈중 마그네슘 농도는 AGG집단에서 유의하게 증가하였다. 신체중심 이동 전과 후의 AGG는 E1-E4구간의 유의한 변화가 없었으며, PG는 증가하였으며, 수직방 향은 AGG의 경우 E3-E4구간 유의하게 증가한 반면 PG는 감소하는 경향으로 나타나 집단과 반복 간에 유의한 상호작용 효과가 있었다. 지면반력 크기변화는 우측전후의 E2, 좌측 좌우결과 E6, 좌측 전후는 E3와 E4, 좌측의 수직 E4 국면에서 집단과 반복 간 유의한 상호작용 효과가 있었다. [결론] 골프선수들의 이온화된 마그네슘 섭취 에 따라 스윙에 영향을 주는 신체중심이동과 지면반력에 긍정적 변화의 가능성을 이번 연구로 확인할 수 있었다.

[Purpose] The purpose of the present study is to analyze the movement of center of gravity and changes in ground reaction force according to ionized magnesium intake during driver swings for female golf athletes. [Method] 14 female golf athletes were randomly divided into a group administered with ionized magnesium(AGG) and a group administered with placebo(PG) for 4 weeks. Using the SPSS 22.0 statistics program, an analysis was conducted using 2-way mixed ANOVA [Result] First, the blood magnesium concentration according to ionized magnesium intake significantly increased after intake in the AGG group. Second, there were no significant changes of E1-E4 in AGG, before and after the movement in center of gravity, And as for the vertical direction, AGG had significant increase between E3 and E4, while PG had decrease to show that there existed significant transactional effects between the two groups. Third, for the size changes in ground reaction force, there were Significant interaction effect on front and back of right side E2 and both sides on the left E6, and the front and back of left side showed significant interaction effects between repetition and group in the E3 and E4, and vertical E4 of the left side. [Conclusion] Possibilities of significant increase of magnesium inside the body due to ionized magnesium intake of golf athletes, the movement of center of gravity that effects the swing and the positive changes to ground reaction force.

[목적] 본 연구는 드라이브 스윙 시 골반의 조기 신전을 보이는 중년 여성을 대상으로 균형 판(balance pad)에서 타격 훈련과 균형 훈련을 시행한 집단의 비거리와 수직력, 조기 신전에 미치는 영향을 검증하는 데 있다. [방법] 훈련 집단 은 타격 훈련, 균형 훈련, 통제 집단으로 구분하여 10명씩 무선 할당하였다. 실험 과제는 드라이브 스윙이었으며, 사 전검사, 사중 검사, 사후 검사 순으로 진행하였다. 측정 변인은 비거리(m), 수직력(N), 골반의 조기 신전(cm)으로 하였 다. [결과] 타격훈련과 균형 훈련은 중년 여성의 비거리, 수직력 및 조기 신전 개선에 효과가 있었다. 타격 훈련은 비 거리와 임팩트 순간의 수직력에서 균형 훈련보다 빠른 시기에 유의한(p<.05) 향상을 보였으며, 골반 Thrust 감소를 통한 조기 신전 개선에도 긍정적인 영향을 미쳤다. [결론] 비거리, 지면반력의 수직력 및 조기 신전 개선을 위해 타격 훈련은 단기간 내 효과적이었으며, 균형 훈련은 장기적인 관점에서 유용한 전략으로 나타났다. 다만, 연구의 기간이 8주로 제한되어 있어 장기간 연구를 통한 효과 검증이 필요하다.

[Purpose] This study aimed to examine the effects of strike and balance training on a balance pad on driving distance, vertical ground reaction force, and early pelvic extension in middle-aged female golfers with early extension. [Method] Participants were randomly assigned to three groups: strike training, balance training, and control (n=10 each).The task was a driver swing, assessed at pre-, mid-, and post-test stages.Variables measured were driving distance (m), vertical force (N), and early pelvic extension( cm). [Result] Both strike and balance training were effective in improving driving distance, vertical force, and early pelvic extension. Strike training showed a significantly earlier improvement (p < .05) in distance and vertical force at impact compared to balance training, and also contributed positively to reducing pelvic thrust and improving early extension. [Conclusion] Strike training showed short-term benefits for distance, vertical force, and early extension, while balance training was effective long term. As the study lasted only eight weeks, longer research is needed.

본 연구의 목적은 착지 시 키 높이 깔창 높이에 따라 젊은 남성의 최대지면반발력시 하지관절각도와 근 활성도에 미치는 영향을 분석하는데 있다. 20대 남성을 대상으로 총 3주에 걸쳐 한 주당 0, 3, 5cm 의 폴리우레탄 소재의 깔창 중 무작 위로 하나를 착용하여 40cm 높이의 플랫폼 위에서 Force plate로 착지 동작을 시행하였다. 착지 동작 중 최대 지면반발력 시 하지의 관절 각도와 넙다리곧은근, 넙다리두갈래근, 앞정강근, 장딴지근의 근활성도를 측정하였다. 깔창의 높이에 따른 하지 관절 각도와 근활성도의 변화를 비교하기 위해 반복요인이 있는 분산분석(one-way ANOVA)을 실시하였다. 하지관절각도 분 석 결과 깔창의 높이가 높아질수록 좌측 발목관절 각도에 영향을 주었으며, 근활성도 분석 결과 깔창의 높이가 높아질수록 우측 앞정강근과 양쪽 넙다리 두갈래근에 영향을 주었다. 하지 근육의 충분한 근력증가를 통하여 착지시 신체를 보호할 수 있을 것이라고 생각되며 깔창의 종류에 따라 영향을 미치는 근육과 하지관절의 각도도 다를 수 있으므로 그에 대한 연구가 필요할 것으로 사료된다.

The purpose of this study is to analyze the effect of the height and insole height upon landing on the lower limb joint angle and muscle activity during maximum ground repulsion in young men. For a male in their twenties, a landing motion was performed with a force plate on a 40cm-high platform by wearing one of 0, 3, 5cm polyurethane insoles per week for a total of 3 weeks. During the landing motion, the joint angle of the lower extremities and the muscle activity of the rectus femoris, biceps femoris, anterior tibialis and calf muscles were measured during the maximum ground repulsion. In order to compare the changes in the joint angle and muscle activity of the lower limbs according to the height of the insole, a one-way ANOVA with repetitive factors was performed. As a result of the analysis of the lower limb joint angle, the higher the height of the insole affected the angle of the left ankle joint. As a result of the muscle activity analysis, the higher the height of the insole affected the right anterior tibialis muscle and biceps femoris. It is thought that it is possible to protect the body when landing through sufficient muscle strength increase of the lower limb muscles. As the angle of the affected muscle and lower limb joint may be different depending on the type of insole, it is considered necessary to study it.