• Title/Summary/Keyword: Foot pressure

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Slip-Related Changes in Plantar Pressure Distribution, and Parameters for Early Detection of Slip Events

  • Choi, Seungyoung;Cho, Hyungpil;Kang, Boram;Lee, Dong Hun;Kim, Mi Jung;Jang, Seong Ho
    • Annals of Rehabilitation Medicine
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    • v.39 no.6
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    • pp.897-904
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    • 2015
  • Objective To investigate differences in plantar pressure distribution between a normal gait and unpredictable slip events to predict the initiation of the slipping process. Methods Eleven male participants were enrolled. Subjects walked onto a wooden tile, and two layers of oily vinyl sheet were placed on the expected spot of the 4th step to induce a slip. An insole pressure-measuring system was used to monitor plantar pressure distribution. This system measured plantar pressure in four regions (the toes, metatarsal head, arch, and heel) for three events: the step during normal gait; the recovered step, when the subject recovered from a slip; and the uncorrected, harmful slipped step. Four variables were analyzed: peak pressure (PP), contact time (CT), the pressure-time integral (PTI), and the instant of peak pressure (IPP). Results The plantar pressure pattern in the heel was unique, as compared with other parts of the sole. In the heel, PP, CT, and PTI values were high in slipped and recovered steps compared with normal steps. The IPP differed markedly among the three steps. The IPPs in the heel for the three events were, in descending order (from latest to earliest), slipped, recovered, and normal steps, whereas in the other regions the order was normal, recovered, and slipped steps. Finally, the metatarsal head-to-heel IPP ratios for the normal, recovered, and slipped steps were $6.1{\pm}2.9$, $3.1{\pm}3.0$, and $2.2{\pm}2.5$, respectively. Conclusion A distinctive plantar pressure pattern in the heel might be useful for early detection of a slip event to prevent slip-related injuries.

Effect of 2 Weeks Backward Walking Exercise on Cervical Angle and Gait Parameters in College Students with Forward Head Posture (2주간 뒤로 걷기 운동이 앞쪽 머리 자세 대학생들의 목뼈 각도와 걸음 변수에 미치는 영향)

  • Park, Han-Kyu;Park, Jin
    • Journal of The Korean Society of Integrative Medicine
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    • v.9 no.3
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    • pp.135-144
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    • 2021
  • Purpose : The purpose of this study was to investigate the effect of 2 weeks of backward walking exercise (BWE) on cervical angle and gait parameters in college students with forward head posture. Methods : Fifteen subjects participated in the experiment. All the participants had a craniovertebral angle (CVA) of 55 degrees or less. The purpose of the study was explained to all the subjects prior to participation, and volunteered to take part in the study. A camera capable of taking pictures of the lateral plane was installed at a distance of 1.5 meters from each subject. Images of forward head posture were obtained before and after performing the BWE, and the CVA and craniorotational angle (CRA) were compared pre- versus post exercise. Foot pressure and gait parameters (step length of left and right, stride length, stance of left and right, swing of left and right, step time of left and right, and stride time) were measured using a rehabilitation treadmill. The subjects performed the BWE for 2 weeks. The exercise program consisted of a 5-minute warm-up exercise, 20-minute main exercise, and 5-minute cool-down exercise. In the main exercise, the treadmill speed was set to 2.4 km/h in the first week and 3.4 km/h in the second week. A paired t test was used to compare the CVA and CRA and gait parameters before and after the exercise. Results : Comparison of the CVA and CRA before and after the BWE revealed a significant difference post exercise, with a marked improvement in forward head posture after the exercise (p<.05). Conclusion : Based on the results of this study, the BWE is considered to be an effective exercise for the forward head posture. Also, additional research is needed to shed light on the impact of the BWE on gait parameters.

A Comparative Study on Biomechanical Variables of Elderly Women and Elderly Women at Risk of Fall in Gait by Environmental Conditions (환경조건에 따른 보행 시 낙상 위험 여성 노인과 정상 여성 노인의 생체역학적 변인 비교 연구)

  • Kim, Tae-Whan;Kim, Dae-Hyun;Min, Seok-Ki;Cho, Eun-Hyung;Lee, Jin-Seok
    • Korean Journal of Sport Biomechanics
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    • v.31 no.3
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    • pp.189-198
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    • 2021
  • Objective: The aim of this study is to investigate the effect of biomechanical variables on gait according to indoor and outdoor environmental conditions in elderly women at risk of falling. Method: 26 elderly women aged 70 years or older, and consisted of 13 elderly people with a walking speed of less 1.0 m/s and 13 people in the fall risk group as normal groups. Depending on the purpose of the study, physical examination and psychological questionnaire were prepared, and then walking was performed in an indoor/outdoor environment, and the gait pattern, muscle activity, and plantar pressure results were compared and analyzed in the elderly females through a 2 group × 2 environment 2-way repeted ANOVA analysis. Results: The gait variable showed an interaction effect the cadence. The muscle variables showed interaction effects in the rectus femoris and tibialis anterior muscles, and the interaction effects of the plantar pressure variables were confirmed in the forefoot and midfoot of the contact area, and the midfoot of the mean pressure. Conclusion: These results indicate that both groups are exposed to falls risk when gait in an outdoor environment, but the fall risk group has a higher risk of falls in both the gait pattern, muscle activity, and plantar pressure variables. The results of this study are considered to be helpful as basic data and development of exercise programs to prevent falls.

Kinetic Analysis of Foot Balance and Gait Patterns in Patients with Adult Spinal Disease (성인 척추질환자의 발균형 및 보행형태에 대한 운동역학적 분석)

  • Park, Jae Soung;Lee, Joong Sook
    • Korean Journal of Sport Biomechanics
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    • v.29 no.1
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    • pp.23-32
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    • 2019
  • Objective: The aim of this study was to provide kinematic data on the characteristics of spinal disease patients by comparing and analyzing kinematic variables related to foot balance and gait pattern of spinal disease. Method: The subjects of the study included 40 adult men and 60 adult women who visited the hospital in Busan. Patients who were diagnosed with spinal disease by a physician through X-ray examination were selected as subjects for the diagnosis of vertebral disc herniation, spinal stenosis, spinal disease diagnosed with spinal disease and the general public. Left and right foot pressure and contact area were checked by Gaitview pro meter. X-ray photographs were taken with a Zen-2090 mobile fluoroscopy under physicians' direct participation. One-way ANOVA was performed to compare the differences between the kinematic variables and post-hoc was performed by the Duncan method. Results: The difference in contact area between the left foot and the right foot was $115.30{\pm}14.15cm^2$ in the left side and $124.25{\pm}13.65cm^2$ in the left side in the spinal disease patients. The difference in pressure between the left and right side of the spinal disease patients was wider than that of the general people. Especially, the right side of the spinal disease patients showed a larger area of left foot contact than the general population. Conclusion: Spinal disease patients have wider contact area of the left foot than those of the general population. In the case of right spinal disease, the left foot support area is widened due to pain. In the gait, women showed slightly more posterior body center than men, and the upper body muscle imbalance and immobilization due to the spinal disease caused imbalance of the muscles moving to the lower limb, It was analyzed to inhibit movement.

Effects of Gastrocnemius Muscle Length on the Dynamic Balance and Antero-posterior Pressure Distribution of Foot (장딴지근 길이가 동적 균형 및 발바닥의 앞뒤 압력 분포에 미치는 영향)

  • Lee, Won-Hwee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.6
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    • pp.150-157
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    • 2019
  • The purpose of this study was investigate the effect of gastrocnemius(GCM) muscle length on the dynamic balance and antero-posterior pressure distribution of foot. Thirty subjects were recruited and each subject was classified with control experimental and control group according to GCM muscle length. The experimental group included subjects with shortness of GCM muscle length, the control group included subjects with normal length of GCM. The dynamic balance and antero-posterior pressure distribution of foot were measured by Biorescue equipment. To evaluate dynamic balance, we collected data of limit of stability in antero-posterior direction. We analyzed the data by using independent t-test. The alpha level was set 0.05. The results showed that the dynamic balance and antero-posterior pressure distribution of foot were significantly different between two groups (p<0.05). This study suggests that the shortness of GCM affects anterior limited of stability in dynamic balance and anterior pressure distribution of foot. Therefore, it is important to maintain optimal GCM muscle length for normal balance ability and prevention of musculoskeletal disease.

The Effect of Action on the Balance and the Trunk Control Ability in the Sit Position of Chronic Stroke Patients (동작관찰훈련이 만성 뇌졸중 환자의 앉은 자세에서 균형과 몸통조절능력에 미치는 영향)

  • Hwang, Junhyun;Lee, Yangjin;Joo, Mincheol;Kim, Seongryeol
    • Journal of The Korean Society of Integrative Medicine
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    • v.7 no.3
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    • pp.1-9
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    • 2019
  • Purpose : To find out how action observation training for chronic stroke patients affects their balance and body control abilities in the posture seated in the rehabilitation of stroke. Methods : This study was conducted on 30 subjects who were diagnosed with stroke. The group conducted motion observation training through video clips, while the control group only conducted physical training, and the general physical therapy was performed equally by both counties. The static balance was measured using Biorescue and the dynamic balance was measured using Modified Functional Reach Test (MFRT), Postural Assessment Scale for Stroke, and Trunk Impairment Scale. Results : Static balance showed statistically significant difference in foot pressure (p<.05) as a result of comparison between pre and post exercise training. Dynamic balance was statistically significant (p>.05) as a result of comparing pre and post differences using modified functional reach test. The trunk control ability was statistically significant (p>.001). Comparison between the results of before and after motion observation training showed a statistically significant difference. Conclusion: This study confirmed that exercise training in sitting position was effective for static, dynamic balance ability and trunk control ability of hemiplegic patients due to stroke. These results suggest that the use of motion monitoring in stroke patients may have a positive impact on the diversity and function of rehabilitation.

Development of Insole for AI-Based Diagnosis of Diabetic Foot Ulcers in IoT Environment (IoT 환경에서 AI 기반의 당뇨발 진단을 위한 깔창 개발)

  • Choi, Won Hoo;Chung, Tai Myoung;Park, Ji Ung;Lee, Seo Hu
    • KIPS Transactions on Computer and Communication Systems
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    • v.11 no.3
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    • pp.83-90
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    • 2022
  • Diabetes is a common disease today, and there are also many cases of developing into serious complications called Diabetic Foot Ulcers(DFU). Diagnosis and prevention of DFU in advance is an important task, and this paper proposes the method. Based on existing studies introduced in the paper, it can be seen that foot pressure and temperature information are deeply correlated with DFU. Introduce the process and architecture of SmarTinsole, an IoT device that measures these indicators. Also, the paper describes the preprocessing process for AI-based diagnosis of DFU. Through the comparison of the measured pressure graph and the actual human step distribution, it presents the results that multiple information collected in real-time from SmarTinsole are more efficient and reliable than the previous study.

A Study of In-sole Plantar Pressure Distribution in Functional Tennis Shoes (기능성 전문테니스화의 족저압력분포 분석)

  • Lee, J.S.;Kim, Y.J.;Park, S.B.
    • Korean Journal of Sport Biomechanics
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    • v.14 no.3
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    • pp.99-118
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    • 2004
  • The aim of this study is to evaluate tennis shoes's plantar pressure distribution in tennis prayers and to determine the influence of the shoe on various tennis movements. When investigating the biomechanics of movement in tennis, one of the first things to do is to understand the movement patterns of the sport, specifically how these patterns relate to different tennis shoes. Once these patterns are understood, footwear company can design tennis shoes that match the individual needs of tennis players. Plantar pressure measurement is widely employed to study foot function, the mechanical pathogenesis for foot disease and as a diagnostic and outcome measurement tool for many performance. Measurements were taken of plantar pressure distribution across the foot and using F-Scan(Tekscan Inc.) systems respectively. The F-Scan system for dynamic in-shoe foot pressure measurements has enabled us to assess quantitatively the efficacy of different types of footwear in reducing foot pressures. The Tekscan F-Scan system consists of a flexible, 0.18mm thick sole-shape having 1260 pressure sensors, the sensor insole was trimmed to fit the subjects' right, left shoes. For this study 4 university male, high level tennis players were instructed to hit alternated forehand stroke, backhand stroke, forehand volley, backhand volley, smash, service movement in 4 different tennis shoes. 1. When impact in tennis movement, peak pressure distribution of landing foot displayed D>C>B>A, A displayed the best low pressure distribution. A style's tennis shoes will suggest prayer with high impact. If prayer with high impact feeling during pray in tennis wear A style, it will decrease injury, will have performance improvement. 2. When impact in tennis movement, plantar pattern of pressure distribution in landing foot displayed B>A>C>D in stability performance. During tennis, prayer want to stability movement suggest B style tennis shoes when tennis movement impact keep stability of human body. B style tennis shoes give performance improvement 3. When impact in tennis movement, plantar pattern of center of force(C.O.F.)trajectory in landing foot analyzed this : 1) When stroke movement and volley movement in tennis, prayer better to rearfoot movement. 2) when service movement, prayer midfoot strike movement. 3) when smash movement, prayer have forefoot strike movement.

The Effect of Foot Strengthening Exercise to Young of Hallux Valgus with Flexible Flatfoot (발 강화 운동이 유연성 편평발이 동반된 엄지발가락가쪽휨증을 가진 젊은 성인에게 미치는 효과)

  • Park, Jin-Hyun;Kim, Jin-Seop;Kim, Kyoung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.11
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    • pp.5211-5217
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    • 2012
  • This study was to evaluate the effects of foot strengthening exercise to improve hallux valgus in young of hallux valgus with flexible flatfoot. Subjects 28 people were randomly divided by the foot strength group(n=14) and control group(n=14). In a period of 8 weeks, they put on I.D.W. Experimental group took foot strengthening exercise for 20 minutes 3 times a week during 8 weeks. Foot structure and max pressure were evaluated by hallux angle, 1~2 metatarsal angle, navicular height, 1st phalange, 2~5phalange, 1st metatarsal, 2nd metatarsal, 3rd metatarsal, 4th metatarsal, 5th metatarsal, mid foot, medial hind foot, lateral hind foot. There were significantly increased by exercise group in outcomes of the structural and plantar foot pressure from hallux angle, 1~2 metatarsal angle, 1st phalange, 1st metatarsal, 2nd metatarsal, 3rd metatarsal, mid foot. The result suggest that foot strengthening exercise is feasible and suitable for individuals with hallux valgus with flexible flatfoot.

Biomechanical Evaluation of Trekking Shoes using 3D Bootie Method as Mimics Barefoot Form (맨발 구조를 모사한 3D Bootie 공법을 적용시킨 트레킹화의 생체역학적 특성 평가)

  • Yoo, Chan-Il;Jeon, Keun-Hwan;Won, Yonggwan;Kim, Jung-Ja
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.7
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    • pp.4689-4696
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    • 2015
  • The purpose of this study was to evaluate biomechanical characteristics of trekking shoes using 3D Bootie method as mimics barefoot form of F Co. that provides the best comfort and plantar pressure dispersion. The control group is normal trekking shoes of M Co. and K Co.. 13 healthy males measured the foot pressure, EMG and GRF. Collected data was analyzed using One-way ANOVA in order to investigate the effects of each trekking shoes. The results are as follows: Trekking shoe of F Co. was significantly wider in contact area than others at MF and significantly lower in maximum force, peak pressure than others at RF. In the case of muscle activity, acted in the same way as the effect of barefoot walking. In the case of GRF, effectively absorbed the impact force, so it is possible to efficient walking. As a result of the analysis, trekking shoe using of 3D Bootie method of F Co. can be efficient walking by reducing the load of foot during walking.