• 대한의용생체공학회:의공학회지
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• 제30권3호
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• pp.247-254
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• 2009

We studied the postural response induced by plantar sole vibration with various frequencies(20, 60, 100Hz) and vibration zone(the anterior and posterior foot zone) of both soles during standing. Eight healthy young adults were exposed to 15s periods of plantar sole vibration while blindfolded. Body sway(COM, center of mass), the angle of neck, trunk, hip, knee, ankle and EMG of four lower limb muscles(tibialis anterior, lateral and medial gastrocnemial, soleus muscle) were recorded during 15s plantar sole vibration using 3D motion analysis system. Simulating each zone separately resulted in spatially oriented body tilts; oppositely directed backward and forward, respectively, the amplitude of which was proportional to the vibration frequency. EMG activity of lower limb muscles also varied according to the direction of the vibration zone and linearly according to the frequency. These findings led us to consider the plantar sole vibration as useful method of postural balance control and adjustment.

• 한국전문물리치료학회지
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• 제14권3호
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• pp.32-40
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• 2007

Although many children with cerebral palsy have problems with their eye movements available data on its intervention is minimal. The purpose of the study was to determine the effectiveness of the postural movement normalization and eye movement program on the oculomotor ability of children with cerebral palsy. Twenty-four children with cerebral palsy (12 male and 12 female), aged between 10 and 12, were invited to partake in this study. The subjects were randomly allocated to two groups: an experimental group received the postural movement normalization and eye movement program and a control group which received conventional therapy without the eye movement program. Each subject received intervention three times a week for twelve weeks. The final measurement was the ocular motor computerized test before and after treatment sessions through an independent assessor. Differences between the experimental group and control group were determined by assessing changes in oculomotor ability using analysis of covariance (ANCOVA). The changes of visual fixation (p<.01), saccadic eye movement (p<.01) and pursuit eye movement (p<.01) were significantly higher in the experimental group than in the control group. These results show that the postural movement normalization and eye movement program may be helpful to treat children with cerebral palsy who lose normal physical and eye movement.

• 한국운동역학회지
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• 제26권4호
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• pp.427-432
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• 2016

Objective: The goal of this study was to systematically investigate the postural stability of dancers by providing unexpected perturbations. Method: Six female dancers and college students participated in this study. Unpredictable wait-pull balance perturbations in the anterior direction were provided to the participants during standing. Three different perturbation intensities (low, moderate, and high intensity) were used by increasing perturbation forces. Spatial and temporal stability of postural control were measured by using margin of stability (MoS) and time to contact (TtC), respectively. Results: Both MoS and TtC at moderate intensity were significantly greater in the dancer group than in the control group, but no significant differences were found at low and high intensities between the groups. Conclusion: The present study showed spatial and temporal stability of dynamic postural control in dancers. We found that the dancers were more spatially and temporally stable than the ordinary participants in response to unexpected external perturbation when the perturbation intensity was moderate at two extreme intensity levels (low and high).

• 한국운동역학회지
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• 제30권3호
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• pp.217-223
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• 2020

Objective: The purpose of this study was to analyze the effect of postural sway on the kinematic variables of the putter head during golf putting and to provide information to the importance of postural sway control in the putting stroke for novice golfers. Method: The center of pressure (CoP) and Kinematics variables of the putter head were calculated during 2 m flat golf putting using 8 motion capture cameras (250 Hz) and 2 force plate (1,000 Hz). SPSS 24.0 was used to perform Pearson's correlation coefficient and simple regression analysis, and the statistically significance level was set to .05. Results: As a result of analyzing the correlation between CoP variables and the putter head rotation angle, the CoP moving length, CoP moving range (ML direction), and CoP moving velocity (ML direction) showed a positive correlation with the putter head rotation angle (yaw axis) and were statistically significant. Conclusion: Therefore, In order to perform the accurate putting stroke maintaining the ball's directionality, it is determined that it is important to control posture sway in the ML directions by minimizing the movement and velocity of the CoP.

• 재활복지
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• 제14권3호
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• pp.225-256
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• 2010

본 연구는 초등학교 지적장애아동의 자세조절 특성을 파악하기 위해 시각, 안뜰감각 그리고 몸감각을 조합하여, 실험 조건에 따라 자세유지를 위하여 어떤 감각을 활용하고 있는지, 부적절한 감각자극에 대해서 통합시스템에서 어떻게 반응하는지, 외부 동요에 대해 신경근육의 자세조절 전략 시 동원되는 근육의 수축 개시시간과 개시순서를 각각 측정하여, 지적장애 아동의 자세조절 특성을 살펴보고, 나아가 초등학교 지적장애아동과 일반아동 간에 어떠한 차이가 있는지를 비교분석하여 자세조절능력 향상 프로그램에 적용 시 방향을 제시해주는데 있다. 이를 위하여 성별과 연령을 고려하여 초등학교 지적장애아동 26명과 일반아동 26명의 아동으로부터 자세조절능력을 비교하였다. 그 결과 자세조절과 감각계와의 관계를 파악한 평형점수와 감각활용 분석, 엉덩관절 전략에 의지하는 자세조절 전략, 근수축 개시지연과 근수축 개시순서의 변화 등을 종합해 볼 때 초등학교 지적장애아동의 자세조절의 문제는 운동시스템, 감각시스템, 통합시스템의 자세조절 시스템 전반에 걸친 총체적인 문제로 나타났다. 따라서 초등학교 지적장애아동의 자세조절 문제 해결을 위해서는 운동시스템, 감각시스템, 통합시스템을 포함하는 포괄적 자세조절 훈련 프로그램의 접근이 필요하다는 것을 알 수 있다. 자세조절 프로그램을 구성할 때, 다양한 감각을 제공하여 주고, 제공된 감각을 효율적으로 활용할 수 있는 감각훈련과 함께 고위중추에서 입력된 감각들을 정상적인 자세조절 발달에 활용할 수 있도록 훈련 시켜주어야 한다. 적응 반응을 계획하고 조직화하여 의미 있는 활동을 통해 중추신경계의 처리능력을 향상시키는 치료프로그램이 제공되어야 한다. 또한 자세조절을 안정적으로 할 수 있는 안정성 한계를 넓힐 수 있는 신경발달학적 치료와 함께, 근골격계에서 빠른 근수축 반응과 효율적인 근수축 개시순서를 유발 할 수 있도록 고유수용성 운동조절 프로그램, 자세반응 촉진 프로그램과 같은 훈련이 필요하다고 할 수 있다.

• 한국전문물리치료학회지
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• 제10권2호
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• pp.11-22
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• 2003

The purpose of this study was to analyze the effects of three different pelvic tilts on a sit-to-stand (STS) and to suggest a new assessment approach based on biomechanical analysis. The three difrent pelvic tilts were: (1) comfortable pelvic tilt sit-to-stand (CPT STS), (2) posterior pelvic tilt sit-to-stand (PPT STS) and (3) anterior pelvic tilt sit-to-stand (APT STS). To determine the onset time of muscle contraction surface electrodes were applied to the rectus femoris muscle (RF), vastus lateralis muscle (VL), biceps femoris muscle (BF), tibialis anterior muscle (TA), gastrocnemius muscle (GCM), and soleus muscle (SOL). The ICC was used for functional linkage analysis. The findings of this study were as follows. First, significant differences were found in kinematic variables and in muscle activation pattern among the three activities. Second, the results of functional integrated analysis revealed that recruited muscle activation patterns changed when the thigh-off was viewed as a reference point. Third, there were independent functional units between the thigh-off and the VL and between the thigh-off and the RF in the functional linkage analysis. The VL and RF acted as prime mover muscles, and more postural adjustment muscle recruitment was required as the demand of postural muscle control increased (PPT STS, APT STS, and CPT STS in order). In conclusion, the findings of this study suggest the following evaluative and therapeutic approach for STS activity. APT STS can be introduced for movement efficiency and functional advantage when abnormal STS is treated. However, excessive APT would change the muscle activation patterns of BF and SOL and require additional postural muscle control to cause abnormal control patterns.

• 대한물리의학회지
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• 제13권2호
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• pp.75-87
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• 2018

PURPOSE: The purpose of this study was to describe and analyze the components of physical therapy interventions to enhance postural control and mobility in children with spastic diplegia. METHODS: Thirsty-eight physical therapists working in rehabilitation settings volunteered to record the components of physical therapy interventions used during 894 treatment sessions for 179 children with spastic diplegia presenting with difficulties in postural control and mobility. Descriptive statistics were used to analyze the general characteristics of the therapists, the patients, and the frequency of the interventions. A one-way analysis of variance (ANOVA) and chi-square test were used to describe the components of the interventions and the goals of treatment. RESULTS: In clinical practice, physical therapists primarily used methods including "Hands-on: facilitation" (n=1990, 36.47%) and "Hands-off: practice" (n=1355, 24.83 %). Only 13.96% (n=762) of the interventions allowed patients to be independent or active outside of the treatment sessions. Interventions reflecting the therapeutic aims were performed for sitting (17.53%), standing (18.25%), and walking (27.39%). CONCLUSION: Physical therapists mostly used "therapistled" interventions to treat impaired postural control and mobility in children with spastic diplegia. Interventions to facilitate independent activity or practice outside the treatment sessions are infrequently used. These types of interventions were used regardless of the aims of treatment.

• 대한산업공학회지
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• 제28권2호
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• pp.216-222
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• 2002

The ergonomic human model can be considered as a tool for the evaluation of ergonomic factors in vehicle design process. The proper anthropometric data on driver's postures are needed in order to apply a human model to vehicle design. Although studies on driver's posture have been carried out for the last few decades, there are still some problems for the posture data to be applied directly to the human model due to the lack of fitness because such studies were not carried out under the conditions for the human model application. In the traditional researches, the joint angles were evaluated by the categorized data, which are not appropriate for the human model application because it is so extensive that it can not explain the posture evaluation data in detail. And the human models require whole-body posture evaluation data rather than joint evaluation data. In this study a postural evaluation function was developed not by category data but by the concept of the loss function in quality engineering. The loss was defined as the discomfort in driver's posture and measured by the magnitude estimation technique in the experiment using a seating buck. Four loss functions for the each joint - knee, hip, shoulder, and elbow were developed and a whole-body postural evaluation function was constructed by the regression analysis using these loss functions as independent factors. The developed postural evaluation function shows a good prediction power for the driver's posture discomfort in validation test. It is expected that the driver's postural evaluation function based on the loss function can be used in the human model application to the vehicle design process.

• 한국산학기술학회논문지
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• 제18권4호
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• pp.341-348
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• 2017

본 연구에서는 척추측만증 환자의 척추 만곡 위치와 방향이 자세 균형에 미치는 영향을 평가하였다. 총 15명의 실험대상자를 흉추 만곡 그룹, 요추 만곡 그룹, 이중 만곡 그룹으로 분류하여 연구를 진행하였다. 초음파 기반 동작 분석 시스템과 압력 분포 시스템을 사용하여 환자의 동적 체간 움직임(요추, 흉요추, 하흉추, 상흉추에서의 각도 변화)과 족저 압력 분포(최대힘, 최대압력)을 측정하였다. 측정 결과를 통해, 특발성 척추측만증 환자의 동적 체간 움직임과 족저 압력 분포 모두 척추 만곡의 발생 부위와 방향에 따라 비대칭적으로 각도와 압력이 증가하면서 자세 불균형이 발생하는 것을 알 수 있었다. 또한, 단일 만곡과 이중 만곡을 가진 그룹 간의 자세 균형 패턴에서의 차이를 확인할 수 있었다. 추후 연구에서는 본 연구에서의 결과를 기반으로 척추측만증 환자의 자세 조절 능력과 체간 균형을 향상시키고 척추측만을 치료하는데 도움을 줄 수 있는 재활 훈련 장치를 개발하고자 한다.

• Transactions on Electrical and Electronic Materials
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• 제15권3호
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• pp.144-148
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• 2014

The purpose of this research is to utilizing the Tetrax$^{(R)}$ balance measuring instrument in order to analyze the postural balance of males and females in their 30 s diagnosed with chronic lower back pain who have followed a 12-week rehabilitation exercise program. The research also examines the effects on any change in back pain level. In terms of the variables in this research, postural balance (left/right, front/back, postural balance) and pain level change (0~100 mm) were measured. Pre-/post-experimental differences were assessed using the paired-t test. In addition, to identify any gender gap, we set the preliminary scores as a covariate and ran the Analysis of Covariance. Statistical significance (a) herein was set at 0.05. As a result of this research experiment, the left/right, front/back, and overall postural balance were found to increase in both the male and female cases, but with no statistical significance or gender gap. However, both males and females showed a significant decrease in their back pain levels. These findings demonstrate the necessity of continuing clinical research based on the Tetrax$^{(R)}$ equipment for scientific evaluation of the effects of rehabilitation exercises on chronic lower back pain patients and their balancing ability.