• 융합정보논문지
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• 제7권2호
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• pp.91-99
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• 2017

본 연구는 기본동작인 분리(isolation) 동작을 통해 K-pop과 B-boy의 동작의 특성을 생체역학적 변인(CoM, CoM velocity, planar angle, joint moment )중심으로 그 차이점을 규명하는데 목적이 있으며, spss 18.0을 이용하여 독립변인 t검증을 실시하였다. 그 결과 첫째, 국면1과 국면2에서 K-pop 댄서의 CoM 합성변위는 B-boy 보다 더 크게 나타났다(p<.05). 둘째, 국면2와 국면3에서 CoM의 이동속도는 K-pop댄서가 B-boy 보다 더 빠른 것으로 나타났다(p<.05). 셋째, 국면1에서 몸통과 골반의 수평각은 K-pop댄서의 오른쪽 수평각, 국면2와 국면3에서 B-boy의 왼쪽 수평각이 더 큰 것으로 나타났다(p<.05). 넷째, 합성모멘트는 엉덩관절의 국면1에서 B-boy가 더 크게 나타났고, 무릎 관절은 국면2, 국면3, 국면4에서 발목관절은 국면3에서 K-pop 댄서가 더 큰 회전력이 나타났다(p<.05). 따라서 동일한 분리 동작이라 할지라도, K-pop과 B-boy 댄서는 다르게 수행함을 발견하게 되었다.

• 한국체육학회지인문사회과학편
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• 제55권2호
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• pp.643-655
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• 2016

본 연구는 내리막 경사의 변화에 따른 노인집단과 젊은 성인집단의 운동역학적 보행분석을 통해, 두 집단 간 보행패턴의 차이를 비교 분석하여 노인들의 운동역학적 측면에서 낙상 요소를 파악하는데 목적이 있다. 20대 건강한 젊은 성인여성집단(yrs: 21.17±1.5)과 65세 이상의 건강한 노인여성집단(yrs: 66.67±1.33)을 대상으로 각각 18명씩 실험 참여자로 선정하였으며 트레드밀 위에서 선호속도로 평지, -7.5°, -15°의 세 가지의 경사조건에서 보행을 실시하였다. 노인집단은 성인집단에 비해 내리막 보행 시 신체중심의 좌우변위가 더 큰 것으로 나타났고(p<.05), 경사에 따라 무릎과 발목 관절의 발목 가동변위는 노인집단이 더 작은 것으로 나타났다(p<.05). 엉덩관절의 가동범위에서는 집단 간 차이가 나지 않았지만 노인집단의 최대 신전 각은 성인집단보다 작은 것으로 나타났다(p<.05). 또한, 내리막 보행 시, 성인집단보다 더 적은 무릎 신전모멘트가 작용한 것으로 나타났다(p<.05). 본 연구 결과 노인들은 내리막 보행 시 낙상 위험에 더욱 노출되고 불안정한 보행을 할 것이라는 예상과 달리 젊은 성인집단보다 더욱 안정적인 보행 전략을 세워서 걷는 것으로 나타났다. 본 연구를 통해 노인들의 보행특성 및 낙상과 관련된 운동역학적 변인을 수집하고, 노인의 낙상을 예방하기 위한 후속연구의 기초자료로서 도움을 줄 것이라 예상된다.

• 한국전산구조공학회논문집
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• 제33권3호
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• pp.145-152
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• 2020

본 논문에서는 유한요소해석을 이용하여 흉요추 후방 고정술의 고정분절 변화에 따른 척추 안정성을 평가하였다. 이를 위해 추간판, 인대, 추간관절(Facet joint) 등을 포함한 정상 흉요추(T10-L4)의 유한요소모델을 구축하였으며, 문헌으로 보고된 재료물성치를 부여하였다. 한편, L1을 병변 부위로 가정하였으며, L1-L2, T12-L2, T12-L1-L2 총 3가지 종류의 후방 고정술을 흉요추 유한요소모델에 구현하고 전방 굽힘, 후방 굽힘, 측면 굽힘, 축 회전의 하중 조건을 부여하였다. 시리즈 유한요소해석을 통해 고정분절에 따른 척추경 나사못, 척추골, 추간판의 변형량, 등가 응력, 운동 범위, 모멘트를 계산하였으며, 그 결과를 바탕으로 척추 안정성을 평가하였다.

• 한국융합학회논문지
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• 제9권8호
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• pp.301-309
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• 2018

본 연구의 목적은 여성선수의 신경인지능력이 양발 착지 시 비접촉성 전방십자인대 손상의 위험요인과 어떠한 관계가 있는지 규명하는 것이다. 여성선수 32명을 대상으로 신경인지검사와 양발 착지에 대한 동작분석을 실시하였다. 전산화된 신경인지 검사의 원점수와 동작분석을 통해 산출된 3차원 관절각, 모멘트, 파워, 수직지면반력, 부하율, 지지시간의 상관관계 분석을 위해 피어슨의 정률상관분석을 실시하였다. 연구결과 신경인지 점수가 높을수록 착지 시 자세유지를 위한 전략을 사용하는 것이 관찰되었다. 따라서 신경인지 검사는 잠재적인 전방십자인대 손상의 위험인자를 검출하기 위한 스크리닝 방법으로 사용 될 수 있을 것으로 생각된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 추계학술대회 논문요약집
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• pp.24-24
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• 2003

For the elderly, achieving a close-to-normal ambulation is important for activities of daily life. Recent researches of SE(Silver Engineering) restoring physical ability would help the elderly by developing the advanced gait assisting devices and orthoses. For the applications using the advanced technologies, the gait characteristics of the elderly must be understood. However, a few studies were performed to investigate the physiological or pathological gaits. The purpose of this study is to provide the gait analysis data and also to investigate relationships between alignment of the lower limb, foot progression angle and knee joint moments in the healthy elderly. By participating a total of 20 healthy elderly persons in this study, the following facts were found: 1) Cadence showed 114.8 steps/min, gait speed showed 1.05 m/s, time per a stride showed 1.06 sec, time per a step showed 0.53 sec, single-supporting phase was 0.41 sec, double-supporting phase was 0.24 sec, stride length was 1.04m, Step length was 0.56m; 2) The maximum knee flexion angle through swing phase showed left 46.82$^{\circ}$, right 40.19$^{\circ}$ and the maximum knee extension angle showed left -1.32$^{\circ}$, right 2.01$^{\circ}$. Knee varus showed left 26.90$^{\circ}$, right 30.93$^{\circ}$; 3) The maximum knee flexion moment showed left 0.363 Nm/kg, right 0.464 Nm/kg, The maximum knee extension moment showed left 0.389 Nm/kg, right 0.463 Nm/kg. The maximum knee adduction moment showed left 0.332 Nm/kg, right 0.379 Nm/kg. The maximum internal rotational moment showed left 0.13 Nm/kg, right 0.140 Nm/kg; 4) The subjects who had varus alignment of the lower extremity had statistically higher in knee adduction moment in mid stance phase; and 5) The subjects who had large foot progression angle had statistically lower in knee adduction moment in late stance phase.

• 한국운동역학회지
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• 제15권2호
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• pp.93-102
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• 2005

The purpose of this study was to examine the effect of step length on the joint moment. The subjects were 4 undergraduate and graduate students in their 20s with normal legs. The subjects were individually tested by the running timer at the walking speed of 0.67m/s, 134m/s, and 2.46m/s. The step length was regulated to -10% of normal, normal and +10% of normal step length using foot print. The walking performances of each subjects were filmed using a high speed video camera. The raw data were analyzed by LabVIEW Graphical Program and these data were analyzed by ANOVAs and Scheffe. The results of this study were as follows: The maximum dorsiflexion moment of the ankle joint increased as the step length increased only at the fast walking speed. Although there wasn't significant difference shown in the plantar flexion moment, regular pattern in the plantar flexion moment which increased as the step length increased was found. The first maximum extension moment of the knee joint increased only at the normal walking speed, but there appeared no significant difference in the maximum flexion and second extension moment. The maximum extension moment of the hip joint increased at the normal and fast walking speed. Although there wasn't significant difference, regular pattern in flexion moment which increased as the step length increased was found.

• 한국운동역학회지
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• 제22권3호
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• pp.325-332
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• 2012

This study aimed to analyze the effects of external load between male and female on angular velocity, moment, and absorbed energy of the lower-extremity joints during drop landing. The study subjects were 9 male($mass=70.82{\pm}4.64kg$, $height=1.71{\pm}0.04m$, $age=24.5{\pm}1.84years$), 9 female($mass=50.14{\pm}4.09kg$, $height=1.61{\pm}0.03m$, $age=23.6{\pm}2.62years$), without any serious musculoskeletal, coordination, balance, or joint/ligament problems for 1 year before the study. The angular velocity, flexion/extension and abduction/adduction moments, and absorbed energy of the lower-extremity joints were compared between the men and women during drop landing under 4 different conditions of external load(0%, 8%, 16%, and 24%) by using two-way repeated ANOVA(p < .05). The women landed with a greater peak angular velocity of the ankle joint, greater peak inversion moment, and lower peak hip-extension moment than the men did, under all 4 conditions. Additionally, the landing characteristics of the women were distinct from those of the men; the women showed a greater peak knee-adduction moment and greater absorbed energy of the knee joint. These differences indicate that anterior cruciate ligament(ACL) strain was greater in the women than in the men and therefore, women may be at a higher potential risk for noncontact injuries of the ACL with an increase in external load.

• 한국운동역학회지
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• 제16권4호
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• pp.31-38
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• 2006

The purpose of this study was to investigate the effect of changing the steps height on the joint moment of lower extremity in stair-descent activity of elderly persons. Data were collected by 3-D cinematography and force platform. 9 male elderly subjects in the 60s and 70s participated in this study. All subjects performed a stair-descent in four different heights of stairs (10, 14, 18, 22cm) having 5 step staircase. The results were as follows. 1. For the step height of 22cm the maximum. plantarflexion moment was the smallest and the largest for the step height of 14cm. 2. There was not a statistical difference shown for the extension moment of the knee joint for the different height of steps. 3. There was not a statistical difference shown for the flexion moment of the hip joint for the varying height of steps but on average for the 18cm step this increased rapidly. 4. The smallest maximum. value for inversion moment was revealed for the step height of 10cm and this increased significantly for the step height of 22cm. 5. The smallest maximum. value for abduction moment of the hip joint was revealed for the step height of 10cm and this increased significantly for the step height of 22cm. 6. There was no significant difference shown for the maximum. abduction moment for the hip joint. The main conclusion is that there is a huge difference in the moment of the lower extremities for the elderly while walking down a stairs with a step height above 18 cm and that this moment increased or decreased rapidly under a condition of step height being 22cm. With the results from this research and related research of elderly walking upstairs it can be shown that the step height has a large role in the safety for the elderly.

• 한국전문물리치료학회지
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• 제15권2호
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• pp.64-72
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• 2008

The purpose of this study was to determine the differences in joint moment in the intact limb of uni-transfemoral amputees and to identify the implications of knee osteoarthritis. As an experimental method, three-dimensional gait analysis was performed on 10 uni-transfemoral amputees and 10 healthy males. Kinematics and kinetics at the hip, knee, and ankle joint were calculated. As a statistical method, independent t-tests were conducted to perform a comparison between the transfemoral amputee group and the control group. The results showed that the external knee adduction moment increased in the transfemoral amputee group (.22 Nm/kg) compared with that of the control group (.13 Nm/kg) at terminal stance (p=.008). External knee flexion moment also increased in the transfemoral amputee group (.24 Nm/kg) but this difference was not statistically significant. External hip flexion moment increased in the transfemoral amputee group (1.35 Nm/kg) compared with that of the control group (.45 Nm/kg) at initial stance, and external hip extension moment decreased in the transfemoral amputee group (-.26 Nm/kg) compared with that of the control group (-.76 Nm/kg) at terminal stance. Although external ankle plantarflexion moment of the transfemoral amputee group increased, it was not found to be statistically significant. The results suggest that the intact limb joint moment of the uni-transfemoral amputees during walking can be different from that of healthy subjects. In conclusion, it was found that there is a link between the increase of external knee adduction moment and the prevalence of knee osteoarthritis in uni-transfemoral amputees. This result is expected to provide some objective data for rehabilitation programs related to knee osteoarthritis in transfemoral amputees.

• 한국운동역학회지
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• 제25권3호
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• pp.257-263
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• 2015

Objective : The purpose of this study was to investigate the effect of genu valgum on the body mass index, movement of lower limb joints, and ground reaction force. Methods : Gait patterns of 30 college students with genu valgum were analyzed and the static Q angle of the femur was measured for selecting genu valgum of the subjects. To analyze the kinetic changes during walking, the six-camera Vicon MX motion analysis system was used. The subjects were asked to walk 12 meters using the more comfortable walking method for walking. After they walked 12 meters more than 10 times, their most natural walking patterns were chosen three times and analyzed. Results : As a result of measuring a relationship between genu valgum and Q-angle, as the Q-angle increases, it showed a genu valgum also increased. Body Mass Index showed a significant difference between the groups was higher in the genu valgum group.(p<.001). The analysis result showed that genu valgum had a significant effect on the internal rotation moment in the hip joint(p<.05). Also, genu valgum had a significant effect on the internal rotation moment of the knee joint(p<.05). The comparative analysis of the Medial-Lateral ground reaction force in the genu valgum group showed a tendency to increase the medial ground reaction force(p<.05). The vertical ground reaction forces of the middle of the stance phase(Fz0) showed a significant increase in genu valgum group(p<.05), in particular the results showed a decrease in the early stance phase(p<.001). Conclusion : In conclusion, the change in body mass is considered to be made by proactive regular exercise for improvement of the genu valgum. In addition, the prevention of the deformation caused by secondary of the genu valgum in this study may be used as an indicator of the position alignment rehabilitation for structural and functional improvements. Applying a therapeutic exercise program for the next lap will require changes in posture alignment.