• The Journal of Korean Physical Therapy
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• 제27권5호
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• pp.351-355
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• 2015

Purpose: This study was conducted to determine how stimulation using Russian current changes isokinetic exercise performance of quadriceps muscle and its antagonist muscles. Methods: Subjects were 20 20-year-old healthy adults who were instructed in the flexion to extension of knees in angular velocity $60^{\circ}/sec$ and $180^{\circ}/sec$ using a Biodex (Biodex system 3). We measured the difference in muscle performance between the Russian current stimulated at the same time during the flexion to extension of knees and not stimulated. Results: The results showed that when Russian current stimulation was applied at the angular velocity $60^{\circ}/sec$, the flexed and extended muscles and the angular velocity $180^{\circ}/sec$ increased significantly, but the peak torque of flexing muscles at the angular velocity $180^{\circ}/sec$ did not increase. Conclusion: These findings suggest that Russian current stimulation with isokinetic exercise of the knee joint could affect the quadriceps muscle and its antagonist muscle performance of muscle strength and endurance.

• The Journal of Korean Physical Therapy
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• 제28권2호
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• pp.112-118
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• 2016

Purpose: This study examined thickness changes in abdominal muscles according to difficulty level of core stabilization exercise in healthy subjects. Methods: Thirty healthy subjects (age range: 21-30 years) volunteered under three conditions. In the first condition, the subjects performed an abdominal draw-in maneuver (ADIM). In the second condition, they performed the ADIM during quadruped exercise using a suspension device without extending their lower limbs. In the third condition, the subjects performed the ADIM during quadruped exercise using a suspension device while extending both lower limbs. The changes in thickness of transverse abdominis (TrA), internal oblique (IO), and external oblique (EO) muscles were measured by ultrasonography (US) imaging during the three experimental conditions, and US was used to measure the improvement ratio of muscle thickness at rest. The interventions were conducted over three trials in each condition, and measurements were performed on each subject by one examiner. Results: Our results showed a significantly greater increase in the muscle thickness of TrA and IO muscles after performance of quadruped exercise using a suspension device without knee extension (p<0.05) compared to the other conditions. The results also showed a significantly greater increase in the thickness changes of EO muscle in those who performed the ADIM during quadruped exercise using a suspension device with knee extension (p<0.05) compared with the ADIM only. Conclusion: These findings demonstrated positive evidence that a low-level core stabilization exercise could improve thickness of abdominal muscles.

• 재활복지공학회논문지
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• 제6권1호
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• pp.59-65
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• 2012

본 연구에서는 등척성 운동 시 단축성 운동과 신장성 운동에 따른 이두근과 삼두근의 근피로도 변화를 근전도를 통해 평가하였다. 건강한 남성12명을 대상으로 팔꿈치 관절의 최대 굴곡을 통한 단축성 운동과 최대 신전을 통한 신장성 운동을 수행하였다. 획득한 근전도 신호는 시간 영역과 주파수 영역에서 Integrated EMG(IEMG)와 Mean Power Frequency(MNF)로 분석하였다. 단축성 운동과 신장성 운동 모두에서 이두근과 삼두근의 IEMG는 증가하였고 MNF는 감소하는 경향을 보였다. 하지만 근 피로지수는 운동 방법에 따라 근의 길이가 신장되는 부위에서 더 높게 나타났다. 이러한 결과는 단축성 운동과 신장성 운동에서 근의 피로는 이두근과 삼두근에서 모두 일어나며 근의 길이 변화가 근의 피로에 영향을 미치는 것으로 사료된다.

• 대한통합의학회지
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• 제7권1호
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• pp.19-26
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• 2019

Purpose : The aim of this study was to investigate the effects of the abdominal draw-in (ADI) exercise on the onset times of the gluteus maximus (GM) and erector spinae (ES) as well as the pelvic anterior tilt angle during prone hip extension (PHE). Methods : A total of 24 female adults were divided into two groups: those with normal abdominal muscles (n=12) and those with weak abdominal muscles (WAM; n=12). Before the intervention, the onset times of the GM and ES along with the pelvic angle during PHE were measured. Subsequently, the participants conducted the ADI exercise for 10 minutes. After conducting the ADI exercise, the onset times and the pelvic angle were re-measured. Results : In the pre-intervention comparison between the two groups, the WAM group showed faster ES onset times and higher pelvic angle than the normal group (p<0.05). In the WAM group, the ES onset times were significantly delayed after the ADI exercise (p<0.05). In both groups, the pelvic angle was significantly decreased after the ADI exercise (p<0.05). The decrease in the pelvic angle was significantly greater in the WAM group than in the normal group (p<0.05). The GM onset time was found to be not significant in all comparisons (p>0.05). Conclusion : Therefore, it can be concluded that after performing the ADI exercise, the pelvic anterior tilt during PHE is decreased in normal women and those with WAM, especially in the WAM group, suggesting that the ADI exercise can reduce the compensatory pelvic anterior tilt more effectively by delaying the ES onset times.

• 정형스포츠물리치료학회지
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• 제14권2호
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• pp.45-53
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• 2018

Purpose: The purpose of this study was to investigate the effects of muscle activity and muscle strength according to verbal command volume during isokinetic and isometric quadricep exercises. Methods: To measure muscle activity and muscle strength, surface electrodes were attached to the participants, as they sat on a Biodex chair. The isometric exercise was performed three times, with maximum exercise at $30^{\circ}$ bending angle, based on a maximum extension state of the knee at $0^{\circ}$. The average holding time was unified to three seconds. In addition, the isokinetic exercise was performed three times, at $60^{\circ}/sec$. The verbal command ranged between 0∾60 dB and 0∾75 dB. Muscle activity was measured using surface electromyography (4D-MT, Relive, Gimhae, Korea). The Biodex System 4 was used to measure the isometric and isokinetic strength of the nodal line, and 4D-MT was used to measure muscle activity. Results: There were significant improvements in the maximal and relative muscle strengths, when the 0∾ 60 dB and 0∾75 dB verbal commands were applied with isokinetic extension/flexion (p<.05). The isokinetic exercise (0∾75 dB) group showed a significant difference in the vastus medialis oblique muscle activity change (p<.05), while the isometric exercise (0∾75 dB) group showed a significant difference in the rectus femoris muscle activity change (p<.05). Conclusions: Our results reveal that verbal commands effectively improve muscle activity and muscle strength during isokinetic and isometric quadricep exercises.

• 재활복지공학회논문지
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• 제5권1호
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• pp.1-10
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• 2011

본 연구에서는 공압 액추에이터를 이용하여 보다 안전하고 편리하게 사용자가 원하는 맞춤형 운동 프로그램을 선택할 수 있는 공압용 슬관절 운동시스템을 개발하였고, 재활운동 시 운동효과에 대한 유효성을 검증하고자 한다. 피험자는 평소 운동을 주 1회 이하로 실시하며 슬관절 신전과 굴곡에 이상이 없는 대학생 수준의 20대 남녀 10명을 대상으로 실시하였다. 실험방법은 기존의 유압식 슬관절 운동장비와 개발된 운동시스템을 이용하여 하루 12회씩 3세트의 슬관절 신전 및 굴곡운동을 실시하고, 주 3회 실시하며 실험은 총 4주간 반복되었다. 운동부하 프로그램은 유압식의 수동형 운동부하와 본 연구에서 개발된 시스템의 능동형 운동부하로 나누어 제공하였다. 운동부하 프로그램에 따른 실시간 근육활성 패턴과 운동 전 후 근육활성도를 비교함으로써 재활운동에 대한 운동효과를 검증하였다. 실험결과 수동형 운동부하보다 능동형 운동부하에 보다 높은 근육활성도를 이끌어 냈으며 운동 4주 후 더 큰 근력증진 효과를 나타냈다. 장비 중심의 운동부하 보다 사용자 중심의 운동부하가 더 효과적으로 근력을 증진할 수 있음을 알 수 있었다. 향후 재활환자나 노약자들에게 안전하고 효율적인 재활운동프로그램으로 활용 될 것이며 또한 재활장비에 적용되어 재활치료관련 종사자들에게 보다 쉽고 편리한 재활운동처방이 가능할 것이라 사료된다.

• 국제물리치료학회지
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• 제9권3호
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• pp.1549-1557
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• 2018

This study examined the effects of group exercise program on health conditions and quality of life in cerebral palsy. Adults with cerebral palsy in their 20's who participated in the evaluation of measurement tools prior to and following the experiment. The control group was engaged in manual exercise for the range of joint movement and extension exercise for arms, legs and trunk, and experimental group performed group exercise program including boccia exercise. The health condition and quality of life of the experimental group were significantly increased after intervention (.05<). There was a slight increase in the control group, however it was not statistically significant. As a result of comparing the health condition and quality of life of the two groups, the value of the experimental group was significantly higher than that of the control group. The results of this study suggest that exercise programs for patients with cerebral palsy in the twenties are considered as beneficial interventions to improve health conditions and quality of life.

• 한국운동역학회지
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• 제27권3호
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• pp.197-203
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• 2017

Objective: The purpose of this study was to determine how exercise intensity affects muscle activity and kinematic variables during squat. Method: Fifteen trainers with >5 years of experience were recruited. For the electromyography (EMG) measurements, four surface electrodes were attached to both sides of the lower extremity to monitor the rectus femoris (RF) and biceps femoris. Three digital camcorders were used to obtain three-dimensional kinematics of the body. Each subject performed a squat in different conditions (40% one-repetition maximum [40%1RM], 60%1RM, and 80%1RM). For each trial being analyzed, three critical instants and two phases were identified from the video recording. For each dependent variable, one-way analysis of variance with repeated measures was used to determine whether there were significant differences among the three different conditions (p<.05). When a significant difference was found, post hoc analyses were performed using the contrast procedure. Results: The results showed that the average integrated EMG values of the RF were significantly greater in 80%1RM than in 40%1RM during the extension phase. The temporal parameter was significantly longer in 80%1RM than in 40%1RM and 60%1RM during the extension phase. The joint angle of the knee was significantly greater in 80%1RM than in 40%1RM at flexion. The range of motion of the knee was significantly less in 80%1RM than in 40%1RM and 60%1RM during the flexion phase and the extension phase. The angular velocity was significantly less in 80%1RM than in 40%1RM and 60%1RM during the extension phase. Conclusion: Generally, the increase of muscle strength decreases the pace of motion based on the relation between the strength and speed of muscle. In this study, we also found that the increase of exercise intensity may contribute to the increase of the muscle activity of the RF and the running time in the extension phase during squat motion. We observed that increased exercise intensity may hinder the regulation of the range of motion and joint angle. It is suitable to perform consistent movements while controlling the proper range of motion to maximize the benefit of resistance training.

• 대한정형도수물리치료학회지
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• 제11권2호
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• pp.83-95
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• 2005

The purpose of this study is to analyze, durability of motor effort after finishing rehabilitation program and the influence from the isotonic lumbar region extension exercise after an operation according to the different operation way in invasive degrees. We selected randomly 80 patients who have no complication and musculoskeletal system diseases with finishing the 12 weeks' rehabilitation program after getting laser discectomy, but fail to conservative treatment, about Lumbar HNP, and divided into minimal invasive groups 38 and invasive groups 42 for study. As the results, in minimal invasive group, after finishing cure and 6 months later, the degree of hold muscle of women is much better than that of men. but in Invasive group, that of men is better than that of women, in case of women, the $0^{\circ}$ and $72^{\circ}$ in lumbar flexion angle have weaken or no improvement than before beginning exercise. and muscle force in $72^{\circ}$ in lumbar flexion angle increased to all men and women than before beginning exercise in Minimal invasive group. but in invasive group. it decreased. When analyze the lapsed time in Minimal invasive group, the groups who start the exercise within 3 months are better than the groups who start the exercise above 3 months after an operation the hold muscle degree all angles after finishing cure and 6 months later. Meanwhile, in invasive group, the groups who start the exercise within 3 months are better than the groups who start the exercise above 3 months after an operation about the hold muscle degree in 36-72 of lumbar flexion angle but 0-36 are not good after finishing cure and 6 months later. When analyze BMI in Minimal invasive group, the normal groups are better than the overweight groups about hold muscle degree in all angles after finishing cure and 6 months later.

• 대한통합의학회지
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• 제5권3호
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• pp.1-9
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• 2017

Purpose: The purpose of this study was to investigate the effects of an immersive, virtual reality-based exercise program on range of motion and dexterity in the upper extremities of stroke patients. Methods: Fifteen patients with hemiparesis after stroke participated in this study. The participants participated in Rapael Semart GloveTM, an immersive, virtual reality-based exercise program, performed for 30 minutes-, 3 times per week for 4 weeks. The Rapael Smart GloveTM program and a Box and Block Test (BBT) were used to measure range of motion and to assess dexterity, respectively, pre-and post-intervention. Results: Range of motion in pronation and supination of the forearm and flexion, extension, and ulnar deviation of the wrist improved after the intervention. Dexterity measured by BBT also improved. However, range of motion in flexion and extension of the fingers and radial deviation of the wrist did not improve. Conclusion: This study presents the effects of an immersive, virtual reality-based exercise program on hand function. In the future, a study comparing an immersive, virtual reality- based exercise program to other upper-extremity interventions for stroke patients should be conducted. A study about the effects of an immersive virtual reality program on activities of daily living is also needed.