• 대한물리의학회지
• /
• 제3권3호
• /
• pp.169-176
• /
• 2008

Purpose : Tandem stance is a clinical measure of standing balance considered to assess postural steadiness in a heel-to-toe position by a temporal measurement. The aim of this study is to investigate postural steadiness and to explore the weight distribution between legs during 25s of quiet stance and tandem stance(right foot was leading) in healthy young adults. Methods : 107 healthy young adults(mean age 21.1 years) are participated. Weight distribution beneath both feet and sway distance were recorded while the subjects performed 25s of quiet stance and tandem stance. Results : Subjects placed more weight on the rear leg in tandem stance and on the left foot in quiet stance. So, quiet stance and tandem stance is not a task for equal weight bearing. Subjects show larger sway distance in anteroposterior direction of tandem stance than quiet stance. Conclusion : The results of this study will be useful to researchers and clinicians using tandem stance measures to evaluate postural steadiness and to predict fall. The results suggest that tandem stance is useful to treat of weight distribution and to improve of balace in elderly adults and stroke patients.

• The Journal of Korean Physical Therapy
• /
• 제24권3호
• /
• pp.181-185
• /
• 2012

Purpose: We investigated balance change in patients with low back pain (LBP) by comparing postural sway velocity between young LBP patients and healthy subjects. Methods: The cross-sectional study enrolled 37 young patients with over 3-month duration of LBP and 38 healthy subjects between the ages of 20 and 30 years old. All subjects were targeted by measuring their balance during quiet standing with open eye and closed eye conditions. The postural sway velocity between the LBP patients and healthy subjects was compared. As well, postural sway velocity was determined in the LBP patients with both eyes open and closed. Results: Significant differences were evident in the anteroposterior and mediolateral mean velocity of center-of-pressure between LBP patients and healthy subjects, and in LBP patients in the eye open and eye closed conditions. Conclusion: The balance of young LBP patients was worse than healthy subjects during quiet standing, and was especially lessened in the absence of vision.

• 대한물리의학회지
• /
• 제10권3호
• /
• pp.39-45
• /
• 2015

PURPOSE: The purpose of this study was to investigate the effect of weight shift training with electrical sensory simulation feedback on quiet standing balance in hemiplegic stroke patients. METHODS: 30 stroke patients were equally allocated at random to an experimental group or a control group. Patients in both two groups underwent comprehensive rehabilitation physical therapy for 30 minutes per day for 5 days per week for 4 weeks. Members of the experimental group received additional weight shift training with electrical sensory simulation feedback was conducted for 15 minutes after 30 minute sessions, whereas members of the control group underwent additional leftward/rightward weight shift training by themselves after 30 minutes per day for four weeks. COP (center of pressure) path lengths, COP velocities, and foot forces were measured before and immediately after the 4-week training period in both groups and results were compared. RESULTS: COP path lengths significantly decreased by 3% after training in the experimental group and this was significantly greater than that observed in the control group (p<0.05). In both groups, foot forces of affected sides showed significant increases after intervention, whereas foot forces of unaffected sides showed significant decreases (p<0.05). No significant difference was observed between the two groups with respect to these changes. CONCLUSION: Weight shift training using electrical sensory simulation feedback has a positive effect on quiet standing balance in hemiplegic stroke.

• 산업경영시스템학회지
• /
• 제43권2호
• /
• pp.39-47
• /
• 2020

Postural stability can reduce the likelihood of critical slip and fall accidents in workplaces. The present study aimed to analyze the effect of shoes type on the ability of postural control during quiet standing. The effect of workload on the body balance was also of primary concern. Thirteen healthy male undergraduate students participated voluntarily in the experimental study. Standing on a force plate with wearing slippers, sports shoes, or safety shoes, two-axis coordinate on subjects' center of pressures (COP) was obtained in the two levels, rest and workload. For the workload level, subjects performed treadmill exercise to reach the predetermined level of physical workload. By converting the position coordinates of COPs, the postural sway length in both anterior-posterior (AP) axis and medio-lateral (ML) axis was assessed. ANOVA results showed that, in AP direction, wearing slippers significantly increased the postural sway length compared to wearing sports shoes or safety shoes. No significant difference in the mean sway length in AP axis was observed between sports shoes and safety shoes. In ML direction, both the workload and the shoes type did not significantly affect the mean length of postural sway. However, the postural sway length increased marginally with the slippers especially during the workload condition. This study explains wearing slippers may interfere with the ability of postural control during quiet standing. Physical workload decreases the ability of postural stability further.

• 한국응용과학기술학회지
• /
• 제39권4호
• /
• pp.507-516
• /
• 2022

본 연구의 목적은 좌우 방향의 회전 후 직립자세 시 압력중심과 근전도 분석을 토대로 회전선호도가 신체 안정성에 미치는 영향을 알아보고자 하였다. 연구의 대상은 오른쪽 손과 발의 편측선호도가 높은 대상자 16명으로 3가지 회전방향 조건(QS: 직립자세, LT: 왼쪽 10바퀴, RT: 오른쪽 10바퀴)을 수행하였다. 회전 후 직립자세 시 안정성을 평가하기 위하여 압력측정판과 근전도를 이용하여 결과를 도출하여 분석하였다. 연구결과로 모든 압력중심 변인은 QS보다 LT, RT가 크게 나타났지만, 회전방향에 따른 차이는 보이지 않았다. 근전도 결과는 좌우 비복근에서 회전방향에 따라 RT가 QS보다 근활성도가 크게 발생되었다. 결론적으로 대상자가 모두 오른쪽 측면선호도가 높았지만 압력중심에서는 회전선호도의 영향이 없었고, 비복근에서는 회전선호도의 영향이 나타났다.

• 한국운동역학회지
• /
• 제34권2호
• /
• pp.71-80
• /
• 2024

Objective: This study aimed to explore the brain connectivity between brain and biomechanical variables by exploring motion recognition through FFT (fast fourier transform) analysis and AI (artificial intelligence) focusing on quiet standing movement patterns. Method: Participants included 12 young adult males, comprising university students (n=6) and elite gymnasts (n=6). The first experiment involved FFT of biomechanical signals (f_CoP, f_AJtorque and f_EEG), and the second experiment explored the optimization of AI-based GRU (gated recurrent unit) using f_EEG data. Results: Significant differences (p<.05) were observed in frequency bands and maximum power based on group and posture types in the first experiment. The second study improved motion prediction accuracy through GRU performance metrics derived from brain signals. Conclusion: This study delved into the movement pattern of upright standing posture through the analysis of bio-signals linking the cerebral cortex to motor performance, culminating in the attainment of motion recognition prediction performance.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
• /
• pp.200.1-200.1
• /
• 2005

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2010년도 추계학술대회 논문집
• /
• pp.961-962
• /
• 2010

• 대한물리의학회지
• /
• 제7권4호
• /
• pp.423-432
• /
• 2012

PURPOSE: The purpose of this study was to investigate balance changes in young patients with neck pain by comparing postural sway velocity and velocity moment between young patients with neck pain and healthy subjects. METHODS: The cross-sectional study enrolled fifteen young patients with over 3-month duration of the neck pain and twelve healthy subjects between the ages of 20 and 30 years old. All subjects were measured their postural sway velocity and velocity moment during quiet standing with eyes open and eyes closed conditions. We compared the differences of postural sway velocity and velocity moment between neck pain patients and healthy subjects, and between eye open and eye close. RESULTS: Significant differences were evident in the anteroposterior and mediolateral sway velocity, and velocity moment of center-of-pressure (COP) between patients with neck pain and healthy subjects (p<.05), and in patients with neck pain in the eyes open and eyes closed conditions (p<.05). CONCLUSION: These results indicate that the balance of young patients with neck pain was worse than healthy subjects during quiet standing, and was especially lessened in the absence of vision. The finding may inform management program to decrease the balance deficits in young patients with neck pain.

• 한국운동역학회지
• /
• 제19권3호
• /
• pp.529-538
• /
• 2009

본 연구의 목적은 여성고령자의 균형과 관련된 평가항목 BBS(Berg balance scale), SPPB(short physical performance battery), TUG(timed up and go)를 측정하여 COP와의 상관관계를 알아보고자 하였다. 이를 위해 여성고령자 10명을 대상으로 신체기능검사와 정적직립자세 동안 지면경사(평지, 내리막, 오르막경사)에 따른 COP 이동범위와 평균속도를 산출하였다. 여성고령자들의 COP 좌우와 전후 값 비교에서 평지와 내리막, 오르막 모두 전후 값이 유의하게 크게 나타났으며, 좌우와 전후 각 방향에서 지면경사에 따른 유의한 차이는 나타나지 않았다. 신체 기능 점수와 COP 상관관계에서 BBS와 SPPB 점수가 높을수록 COP 이동범위와 평균속도 값은 감소하였으며 TUG 값이 클수록 COP 값이 크게 나타나는 유의한 상관관계를 나타냈다. 고령자들에게 균형과 관련된 신체기능검사와 COP는 지면경사에 따라 유의한 상관관계를 가지므로 임상에서 치료사들은 고령자들의 균형평가 시 COP 변수뿐만 아니라 BBS, SPPB, TUG를 통한 균형평가 활용이 가능하다고 본다.