• 한국콘텐츠학회논문지
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• 제13권12호
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• pp.276-290
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• 2013

연구목적: 본 연구는 생애전환기를 맞이한 초기노인을 대상으로 낙상경험과 낙상의 내재적 요인을 성별에 따라 비교하였다. 연구방법: 연구대상자는 2008년 1월부터 12월까지 국민건강보험공단에서 실시한 66세 생애전환기 건강진단검사를 받은 수검자 중 자료가 불충분한 것을 제외한 255,505명을 대상으로 2차분석한 서술적 단면연구이다. 연구결과: 생애전환기를 맞이한 66세 초기노인의 낙상경험은 전체 10.6%로 남자 8.5%, 여자 12.4%로 여성노인이 남성노인에 비해 낙상비율이 높았다. 남녀에서 낙상위험에 영향을 미치는 요인은 배뇨장애 6.2-6.6배, 우울 1.5-1.8배, 보행장애 1.3-1.5배, 및 실명 1.3-1.4배 순서로 나타났다. 연구결론: 비록 내적 낙상위험요인이 다양할지라도 효과적인 낙상예방을 위해서 배뇨장애가 중요한 내재적 예측요인이며, 이는 초기노인의 낙상에 영향을 줄 수 있다.

• 대한의용생체공학회:의공학회지
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• 제27권6호
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• pp.323-331
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• 2006

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.

• Journal of Acupuncture Research
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• 제24권5호
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• pp.43-52
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• 2007

Objective : The purpose of this study is to present the epidemiological data on stroke patients admitted to Department of Acupuncture & Moxibustion, Kang-Nam Korean Medicine Hospital Kyunghee University and comparison to past stroke patient studies. Methods : Research was conducted by surveys and charting of patients with a stroke admitted to Department of Acupuncture & Moxibustion Gang-Nam Korean Medicine Hospital Kyunghee University from Jan. 1. 2005 to Dec. 31. 2006. Results : There was 2.3 times more cerebral infarction than cerebral hemorrhage and 1.5 times more female patients. Older patients showed more infarction than hemorrhage. Patient range was mostly in the 70year old range. Preceding diseases were hypertension>diabetes>hyperlipidemia. Gait condition improved during hospitalization. Most patients were admitted after 61 days of stroke onset and hospitalization period exceeded 71days. 76% of patients received treatment from other medical facilities before admittance. Most patients came from western medicine hospitals. Triglyceride levels were high at 32.3% at the time of admittance. The most common symptom in admission time was headache. Conclusion : Acute stroke patients decreased, long term patients increased, and patients who came from other medical facilities increased.

• 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.

• 한국전문물리치료학회지
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• 제27권4호
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• pp.227-232
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• 2020

Background: Hallux valgus (HV) is a foot deformity developed by mediolateral deviation of the first metatarsophalangeal joint. Although various foot-toe orthoses were used to correct the HV angle, verification of the effects of kinetics variables such as ground reaction force (GRF) through three-dimensional (3D) gait analysis according to the various type of orthoses for HV is insufficient. Objects: This study aimed to investigate the effect of soft and hard types of foot and toe orthoses to correct HV deformity on the GRF in individuals with HV using 3D motion analysis system during walking. Methods: Twenty-six subjects participated in the experiment. Participants had HV angle of more than 15° in both feet. Two force platforms were used to obtain 3D GRF data for both feet and a 3D motion capture system with six infrared cameras was used to measure exact stance phase point such as heel strike or toe off period. Total walk trials of each participant were 8 to 10, the walkway length was 6 m. Two-way repeated measures ANOVA was used to determine the effects of each orthosis condition on the various GRF values. Results: The late anteroposterior maximal force and a first vertical peak force of the GRF showed that the hard type orthosis condition significantly increased GRF compared to the other orthosis conditions (p < 0.05). Conclusion: There were significant effects in GRF values when wearing the hard type foot orthosis. However, the hard type foot orthosis was uncomfortable to wear during walking. Therefore, it is necessary to develop a new foot-toe orthosis that can compensate for these disadvantages.

• 한국콘텐츠학회논문지
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• 제10권2호
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• pp.268-276
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• 2010

본 연구의 목적은 경사로를 오르는 동안 슬관절 굴곡각도와 족저압의 차이를 각각 다른 경사도에 따라 분석하고자 하는 것이다. 24명의 건강한 성인 참가자들에게 각각의 경사도($0^{\circ},\;3^{\circ},\;6{\circ},\;9^{\circ}$)를 걷게 한 후, Parotec system을 이용하여 족저압을 측정하였으며, 걷는 모습을 캠코더로 녹화 한 후 Dartfish system을 이용하여 슬관절 각도를 분석하였으며, 수집된 데이터는 SPSS/PC 통계 프로그램을 이용하여 일원배치분산분석으로 분석하였다. 결과는 각 경사로에 따라 슬관절 굴곡 각도는 통계학적으로 유의한 차이가 나타났으며, 족저압은 좌측 하지의 발뒤꿈치 외측 부위(1번 감지기), 중족부 내측 부위(9번 감지기), 전족부 내측 부위(15번, 16번 감지기), 그리고 우측 하지에서는 발뒤꿈치 외측 부위(3번 감지기)에서 통계학적으로 유의한 차이를 보였다. 슬관절 각도가 $10{\sim}20^{\circ}$ 사이에서 발뒤꿈치 외측 부위 및 내측 부위의 족저압이 통계학적으로 유의하게 높게 나타났다.

• 대한기계학회논문집A
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• 제24권3호
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• pp.613-624
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• 2000

In this study, new design method of prosthetic foot was suggested which can evaluate the performance of prosthetic foot by implementing amputee's gait simulation using the finite element analysis. The basic shape of ESPF(Energy Storing Prosthetic Foot) was designed which is suitable for the below-knee amputee considering mechanical properties and kinematic properties. And, the performance evaluations were performed using the Taguchi method with orthogonal array L25. As a result, average main effect of factors for the ESPF's performance were calculated and then optimum condition of given shape was selected. Essential particulars for the performance evaluation from the simulation result were the quantity of external work needed in stance phase, the quantity of transferred energy from the ESPF through the knee, and the vertical displacement of knee at toe-off. Reasonable optimum condition was obtained from the using performance index. From this study, it was found that it is necessary for the design of ESPF to consider the geometrical data related to the magnitude of load on elastic material.

• The Journal of Korean Physical Therapy
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• 제30권1호
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• pp.14-22
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• 2018

Purpose: This study examined the effects of the lower limb alignment on the pelvis, hip, and knee kinematics in people with genu varum during stair walking. Methods: Forty subjects were enrolled in this study. People who had intercondylar distance ${\geq}4cm$ were classified in the genu varum group, and people who had intercondylar distance <4cm and intermalleolar distance <4cm were placed in the control group. 3D motion analysis was used to collect the pelvis, hip, and knee kinematic data while subjects were walking stairs with three steps. Results: During stair ascent, the genu varum group had decreased pelvic lateral tilt and hip adduction at the early stance phase and decreased pelvic lateral tilt at the swing phase compared to the control group. At the same time, they had decreased minimal hip adduction ROM at the early stance and decreased maximum pelvic lateral tilt ROM and minimum hip rotation ROM at the swing phase. During stair descent, the genu varum group had decreased pelvic lateral tilt at the early stance and decreased pelvic lateral tilt and pelvic rotation at the swing phase. In addition, they had decreased pelvic frontal ROM during single limb support and increased knee sagittal ROM during the whole gait cycle. Conclusion: This study suggests that a genu varum deformity could affect the pelvis, hip and knee kinematics. In addition, the biomechanical risk factors that could result in the articular impairments by the excessive loads from lower limb malalignment were identified.

• 대한물리의학회지
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• 제8권1호
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• pp.1-9
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• 2013

PURPOSE: This study compared the effects of dual motor task training and simple task training on the balance of subacute stroke patients. METHODS: A total of 23 subacute stroke patients participated in the study. The subjects were allocated randomly to two groups: an experimental group and a control group. Both groups received conventional treatment for 50 minutes, 5 times per week for 6 weeks. In addition, the experimental group stacked blocks, moved catch cups, and moved rings while standing and gait. To evaluate the effects of the exercises, subjects were evaluated by using the balance system and the timed get up and go test(TUG) for balance measurement. The data was analyzed using a paired t-test and independent t-test to determine the statistical significance. RESULTS: The experimental group showed a significant decrease on the medial-lateral and anterior-posterior stability index compared to the control group (p<.05) for the simple task and a significant decrease on the medial-lateral and anterior-posterior stability index compared to the control group for the dual task. In addition, the experimental group showed a significant increase in TUG time compared to the control group (p<.05). CONCLUSION: These results support the perceived benefits of dual motor task training to augment the balance of subacute stroke patients. Therefore, dual motor task training is recommended for subacute stroke patients.

• 한국운동역학회지
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• 제23권4호
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• pp.377-385
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• 2013

Fall is very fatal accident causes death to older people. Shoe may affect to fall. Shoe influences risk of slips, trips, and falls by altering somatosensory feedback to the foot. The purpose of this study was to investigate the analysis of non-slip shoes for older people and influence on older people's lower extremity. For this study twenty three healthy older people were recruited. Each subjects walked over slippery surfaces (COF 0.08). Four pairs of non-slip shoes (shoe A had the greatest COF, 0.23 while shoe B, C, and D had smaller COF relatively) for older people were selected and tested mechanical and biomechanical experiment. For data collection motion capture and ground reaction forces were synchronized. There were statistically significant differences for slip-displacement, coefficient of friction, braking force, propulsion force, knee range of motion and knee joint stiffness by shoes. It was concluded that shoe A was the best for non-slip function because of the lowest slip displacement, the highest braking and propulsion forces, and the highest mechanical and biomechanical coefficient of friction where as shoe B, C, D were identified as a negative effect on the knee joint than shoe A. To prevent fall and slip, older people have to take a appropriate non-slip shoes such as shoe A.