• Title, Summary, Keyword: Postural control

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Characteristics of Dynamic Postural Control in Anteroposterior Perturbation of a Platform (전후방향의 플랫폼 이동에 대한 동적균형 회복 특성)

  • 태기식;김영호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1066-1069
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    • 2002
  • Dynamic postural control varies with the environmental context, specific task and intentions of the subject. In this paper, dynamic postural control against forward-backward perturbations of a platform was estimated using tri-axial accelerometers and a force plate. Ten young healthy volunteers stood upright in comfortable condition on the perturbation system which was controlled by an AC servo motor. With anterior-posterior perturbations, movements of ankle, knee and hip Joints were obtained by tri-axial accelerometers. and ground reaction forces with corresponding displacements of the center of pressure(CoP) by the force plate. The result showed that the ankle moved first and the trunk forward, which implies that the mechanism of the dynamic postural control in forward-backward perturbations, occurred in the procedure of the ankle, the knee and the hip. Knee flexion and hip extension in the period of acceleration, constant velocity and deceleration phase is very important fur the balance recovery. These responses depends on the magnitude and timing of the perturbation. From the present study the accelerometry-system appears to be a promising tool for understanding kinematic accelerative In response to a transient platform perturbation. A more through understanding of balance recovery mechanism may aid in designing methods for reducing falls and the resulting injuries.

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The Circadian Effects on Postural Stability in Young Adults

  • Son, Sung Min
    • The Journal of Korean Physical Therapy
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    • v.29 no.3
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    • pp.142-144
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    • 2017
  • Purpose: Few studies have addressed the effect of diurnal circadian rhythms on postural stability, and thus the aim of the present study was to examine circadian effects on static and dynamic postural stability in young adults. Methods: Twenty-four subjects (9 men, 11 women: age=$22.20{\pm}1.77$, height=$167.20{\pm}10.47$, weight=$59.85{\pm}10.66$) from a university community volunteered for this study. Static and dynamic balance testing, which recorded using a Good Balance system (Good Balance, Metitur Ltd, Finland) was conducted at 9:00, 13:00, and 17:00 hours on two consecutive days, and the sequencing of static and dynamic balance tests were randomized. Results were analyzed using the non-parametric one-way repeated Friedman test in SPSS version 18.0 (SPSS Inc., Chicago, IL, USA), and variable found to be significant were subjected to Wilcoxon post hoc testing. Results: Static and dynamic balance showed significant difference at the three times assessments (test at 9:00, 13:00, and 17:00) during circadian. In the post hoc test of static (anteroposterior distance, mediolateral distance and COP (center of pressure) velocity) and dynamic balance (performance time), 13:00 was the longer and faster than 9:00. Conclusion: These results indicated that control of postural balance is influenced by diurnal circadian rhythms, and confirm that control of postural balance is more effective and better performance in the 09:00 hours than 13:00 hours or 17:00 hours.

Correlation Between the Lateral Flexion Postural Habit of the Neck and Sense of Position (경부의 외측굴곡 자세습관과 위치감각과의 관계)

  • Kim, Young-Min
    • The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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    • v.17 no.2
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    • pp.1-9
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    • 2011
  • Background: Injury or pain in the neck can affect proprioception. People who have a reduced proprioception are easily exposed to induce injury or pain. The aim of this study was to examine the reduced proprioception among people who had lateral flexion postural habit of neck in a sitting position. Methods: Twenty subjects with lateral flexion postural habit were compared with a matched control group. Relocation errors in 30 degree rotation to the right were measured three times with and without visual information randomly. Results: Relocation errors were higher in the lateral flexion postural group than the control group with (p<.01) and without (p<.005) the visual information. Visual information didn't affect the cervical relocation errors in the abnormal and control groups. Repetition is increased the relocation errors with (p<.01) and without (p<.001) visual information. Conclusions: The results support the hypothesis that subjects with lateral flexion postural habit have incorrect perception of their head position. It is necessary to realize the possibility of injury or pain found among people with lateral flexion postural habit.

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Comparison of the Effects of Dynamic Postural Stability Training Versus Soft Ankle Bracing on Multiple Hop Performance in Participants With Functional Ankle Instability (기능적 발목 불안정성을 가진 대상자에게 동적 자세 안정성 훈련과 연성 발목 보조기가 다중 한발 뛰기 수행에 미치는 효과 비교)

  • Cha, Youn-sang;Park, Kyue-nam
    • Physical Therapy Korea
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    • v.24 no.1
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    • pp.1-8
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    • 2017
  • Background: The multiple hop test is an active performance test that has been commonly used to assess individuals with functional ankle instability. Previous studies have suggested that insufficiency of dynamic postural stability and passive stability during dynamic activities can have an influence on performance in the multiple hop test. However, no study has investigated the effects of dynamic postural stability training and ankle bracing on multiple hop test performance in individuals with functional ankle instability. Objects: The purpose of this study was to compare the immediate effects of dynamic postural stability training versus ankle bracing in the performance of the multiple hop test for participants with functional ankle instability. Methods: Twenty-nine participants with functional ankle instability who scored below 24 in the Cumberland Ankle Instability Tool were selected. The participants were randomly divided into two groups: a dynamic postural stability training group (n1=14) and an ankle bracing control group ($n_2=15$). The multiple hop tests were performed before and after applying each intervention. Dynamic postural stability training was performed using visual-feedback-based balance-training equipment; participants in this group were asked to perform a heel raise in a standing position while watching the centering of their forefoot pressure to prevent excessive ankle inversion. Ankle bracing was applied in the control group. Results: When comparing the pre- and post-intervention period for both groups, both methods significantly improved the results of the multiple hop test (p<.05). However, no significant differences were shown between the dynamic postural stability training and ankle bracing groups (p>.05). Conclusion: Both dynamic postural stability training and ankle bracing showed significant improvement (2.85 seconds and 2.05 seconds, respectively) in test performance. Further study is needed to determine the long-term effects of dynamic postural stability training and to determine whether insufficient dynamic postural stability is a causative factor for functional ankle instability.

Effects of Postural Balance at Game-based Visual Feedback Training of the Elderly (고령자의 게임기반 시각피드백 훈련에 따른 자세 균형 효과)

  • Yi, Jeong-Won;Yu, Mi;Lee, Ah-Reum;Kwon, Tae-Kyu
    • The Journal of the Korea Contents Association
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    • v.13 no.10
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    • pp.9-18
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    • 2013
  • In this paper, we analyzed the effects of game-based visual feedback training on postural balance control in young adults and older adults. We provided postural balance training by 23 young adults and 14 older adults and for four weeks in fifth minute a day and three days a week using IBalance(Cybermedic Inc., Korea). We evaluated the ability of postural balance using balance SD(Biodex, medicalscience Inc., USA) for the validation of game contents based on visual feedback training program. The results showed that postural stability and limits of stability of young adults and older adults were improved significantly before and after the training(p<0.05). Thus, the games of postural balance encouraged anterior, posterior, medial, lateral and multidirectional weight shifting regarding postural balance. Our study indicates that postural balance training of visual feedback based game could be adapted for improving postural balance. Moreover, we could develope of game contents for individuals and various ages for effective application of this game-based visual feedback training.

Open Loop Responses of Posture Complexity in Biomechanics

  • Shin, Youngkyun;Park, Gu-Bum
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.8
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    • pp.42-50
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    • 2013
  • The reactionary responses to control human standing dynamics were estimated under the assumption that postural complexity mainly occurs in the mid-sagittal plane. During the experiment, the subject was exposed to continuous horizontal perturbation. The ankle and hip joint rotations of the subject mainly contributed to maintaining standing postural control. The designed mobile platform generated anterior/posterior (AP) motion. Non-predictive random translation was used as input for the system. The mean acceleration generated by the platform was measured as $0.44m/s^2$. The measured data were analyzed in the frequency domain by the coherence function and the frequency response function to estimate its dynamic responses. The significant correlation found between the input and output of the postural control system. The frequency response function revealed prominent resonant peaks within its frequency spectrum and magnitude. Subjects behaved as a non-rigid two link inverted pendulum. The analyzed data are consistent with the outcome hypothesized for this study.

Effect of Interactive Metronome Training on Postural Control and Hand Writing Performance of Children With Attention Deficit Hyperactivity Disorder (ADHD): Single Subject Research (상호작용식 메트로놈(Interactive Metronome) 훈련이 주의력결핍 과잉행동장애 아동의 자세조절과 글씨쓰기 수행에 미치는 영향: 단일사례연구)

  • Park, Min-Kyoung;Kim, Hee
    • The Journal of Korean Academy of Sensory Integration
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    • v.16 no.1
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    • pp.14-24
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    • 2018
  • Objective : The purpose of this study was to identify the effect of Interactive Metronome (IM) training on postural control and hand writing performance of children with Attention Deficit Hyperactivity Disorder (ADHD). Methods : Participant was a third grade elementary school student diagnosed with ADHD. ABA design was used and a total of 30 sessions were held for 3 sessions every week for a total of 10 weeks. In the intervention period, IM training was conducted for 40~50 minutes before intervention for writing, and the writing task was carried out. We evaluated the handwriting legibility and speed. Before baseline A and within a month after A' phase, Clinical Observation of Motor and Postural Skills (COMPS) was evaluated to examine the changes in postural control of the student. Results : After the IM intervention, the postural control of the student improved in the score of slow movement, finger-nose touching, and asymmetrical tonic neck reflex. The handwriting legibility and speed has also tended to increase during the intervention period, but it has not significantly changed. Conclusion : This study could be used as an evidence that the IM training aimed at postural control and handwriting ability could enhance the ability to improve postural control and thereby provide fundamental knowledge for future studies.

The Effect of Age and Dual Task to Human Postural Control (연령와 이중과제 수행이 자세제어에 미치는 영향)

  • Shin, Sunghoon;Jang, Dae-Geun;Jang, Jae-Keun;Park, Seung-Hun
    • Korean Journal of Sport Biomechanics
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    • v.23 no.2
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    • pp.169-177
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    • 2013
  • The purpose of this study is to investigate the effect of aging and dual tasking to the postural control during quiet standing. It was hypothesized that the center of pressure (COP) dynamics would be differently affected by aging and characteristics of the task. Total 60 adults (35 young adults and 25 older adults) participated in this study. They conducted two different standing tasks (dual vs. Nondual) twice in a random order. Variability, complexity, coupling and symmetric index from the left, right and overall COPs were measured by various parameters in nonlinear, linear and frequency analyses methods. Results demonstrated that older adults had worse performance in postural control with decreased complexity in overall sway movement, and increased coupling between left and right limb COP movement, even though there was no significant difference in symmetric index. These tendencies are generally clearer in nonlinear measures at the dual task condition. Results implied that older adults had compensatory strategy in dual tasking which results in simple and combined postural movement patterns.

Effects of Fall Prevention Program on Muscle Strength, Postural Balance, and Fear of Falling in Elderly (낙상예방프로그램이 노인의 근력, 균형 및 낙상두려움에 미치는 효과)

  • Shin, Jung Soon;Kim, Yeong Kyeong;Kang, Mi Ae;Yeo, Hyung Nam
    • Journal of Korean Clinical Nursing Research
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    • v.22 no.1
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    • pp.10-19
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    • 2016
  • Purpose: This study was to develop a fall prevention program and test the effects of the program on the muscle strength, postural balance and fear of falling for elderly. Methods: This study was conducted using a nonequivalent control group pretest-posttest design. There were 21 participants in the experimental group and 22 in the control group. Data were collected from July to September 2015. Questionnaires were completed three times (at pretest and after 8 and 10 weeks). Data were analyzed using $x^2$ test, Fisher's exact test, t-test, and repeated measure ANOVA. Results: Lower extremity muscle strength and postural balance scores were significantly improved in the experimental group compared to the control group. However, fear of falling was not significantly different between the experimental and control groups. Conclusion: The study results indicate that fall prevention programs for the elderly can be useful to improve muscle strength and postural balance.