• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1704-1708
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• 2008

Many studies have emphasized the importance of resistive exercise to maintain a healthy human body, particular in prevention of weakening of physical strength. Recently, some studies advocated that an application of vibration as a supplementary means in a regular training was effective in encouraging physical strength. Aim of the current study was, therefore, to identify if an application of vibration in a resistive exercise was effective in encouraging physical strength as that in a regular training. A 3-dimensional virtual lower extremity model for a healthy male and virtual leg-press model were generated and synchronized. Dynamic leg-press exercises on a slide machine with/without extra load and on a footboard with vibration as well as on a slide machine with extra load were analyzed. The results of the current indicated that the application of the vibration on the dynamic leg-press exercise might be not greatly effective in encouraging physical strength, compared with the dynamic leg press exercise with extra load. It was, however, thought that the application of the vibration might be helpful to elderly individuals because the reduced maximum muscle strength appeared by the effect of the vibration may avoid a muscular spasm, which can be driven from a high muscle strength sometimes produced during the leg-press exercise with extra load.

• 한국기계가공학회지
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• 제18권1호
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• pp.46-51
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• 2019

As the industry develops and quality of life increases, the concept of leisure is also changing. Bicycling is a healthy sport for exercising while enjoying nature, facilitating the enjoyment of a healthy life. As a result, the awareness surrounding bicycles has increased, and so has the interest in lighter and more luxurious carbon bikes. The number of domestic companies producing carbon bicycles frames is nil. In this study, we analyze the frames of existing foreign brands and analyze the deformation and stress concentration area according to the load of the frame, using the finite element analysis. In addition, we set up the range of stiffness based on the content of the structural analysis, to localize the carbon bicycle frame and famous foreign products, and compare the prototype with the stiffness by using bicycle molds for track races.

• 한국산학기술학회논문지
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• 제18권8호
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• pp.190-199
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• 2017

본 연구의 목적은 남성 제조업 근로자의 근무형태에 따른 건강 체력 평가기준을 제시하는데 있다. 피험자는 K 기관에서 실시한 건강 체력검사를 받은 40, 50대 남성 제조업 근로자 15,329명이다. 건강 체력 요인은 심폐지구력, 근력, 근지구력, 유연성, 신체조성이다. 각각의 요인을 확인하기 위해 최대산소섭취량, 악력, 윗몸일으키기, 앉아 윗몸 앞으로 굽히기, 체지방률을 측정했다. 자료는 SPSS version 18.0 프로그램을 이용하여 이원분산분석, T-검정, 일원 분산분석(Scheffe), 백분위 수로 분석하였다. 분석 결과는 다음과 같다. 첫째, 제조업 근로자의 건강 체력은 근무형태에 따라 유의한 차이가 나타나(최대산소 섭취량 : F=88.67 (p<.001), 악력 : F=20.09(p<.001), 윗몸일으키기 : F=42.06(p<.001), 앉아 윗몸 앞으로 굽히기 : F=69.44(p<.001), 체지방률 : F=136.75(p<.001)) 건강 체력 항목의 백분위수를 토대로 평가 기준을 설정하였다. 둘째, 최대산소섭취량, 악력, 앉아 윗몸 앞으로 굽히기는 현장직 근로자의 평균값이 사무직 근로자의 평균값보다 모든 연령에서 높게 나타났다. 반면에 윗몸일으키기와 체지방률은 사무직 근로자의 평균값이 현장직 근로자의 평균값보다 모든 연령에서 높게 나타났다. 셋째, 이러한 평가 기준은 국민체력실태조사 기준치와 비교했을 때 많은 차이가 있었다. 따라서 근로자의 건강 체력 평가 시에는 근로자의 근무 형태에 따라 평가 기준을 다르게 적용해야 한다는 것이 확인되었다.

• 한국운동역학회지
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• 제21권2호
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• pp.173-179
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• 2011

This study aims to analyse difference in biomechanical factors between dominant legs and recessive ones according to muscular imbalance during drop landing targeting talented children in sports. The subjects of the study were ten primary students who are attending to Sports Program for Talented Children organized by C university (age: $12.28{\pm}0.70$ year, height: $1.52{\pm}0.11$ m, and weight: $45.2{\pm}4.9$ kg). Strength legs were classified into dominant side and strengthless legs were classified into non-dominant legs. For three-dimensional analyses of the data collected, 6 video cameras(MotionMaster200, Visol, Korea) were used. To analyse ground reaction force, two force platforms(AMTI ORG-6, MA) were used and to analyse electromyograghy a 8-channeled wireless Noraxon Myoresearch made in USA was used at 1000 Hz for sampling. As a result, it was discovered that the dominants legs controlled knee bending motions more stably than strengthless legs as the maximum vertical ground reaction force was significantly high in dominant legs(p<.05), and joint moment of knee joints of the dominant legs was high(p<.05). Therefore, this study suggested that injury prevention program focusing on muscular balance as well as the existing sports programs for talented children should be developed based on results of the study and it is expected that the results will be useful for improvement of sports programs for talented children.

• 대한임상전기생리학회지
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• 제9권1호
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• pp.9-14
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• 2011

Purpose : The purpose of this study is to examine the influence of a core stability exercise program using Swiss Ball on muscle activity, muscle thickness, maximum muscular strength, and pain in the trunk region during a 6-weeks program involving participants who have lower back pain. Methods : A total of 21 males between the ages of 20 and 33 years old were divided into 3 Swiss Ball exercise groups. Group 1 performed isometric exercises, group 2 performed isotonic exercises, and group 3 performed mixed exercises. Measurements were taken prior to starting the exercise program and after completing the program at the 6-week period using ME6000 to measure muscle activity and VAS to measure pain reduction. Comparisons were made using a paired t-test and ANOVA on SPSS 10.0. Results : There was a statistically significant effect in muscle activity for group 1 and group 3. Secondly, there was a statistically significant effect in pain reduction for group 1, group 2, and group 3. Conclusion : We found that isometric exercises performed by group 1 were effective in improving muscle activity and pain reduction.

• 국제물리치료학회지
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• 제3권2호
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• pp.422-428
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• 2012

The present study purposed to examine the effects of transcutaneous electrical nerve stimulation, self-stretching and functional massage on the recovery of muscle contraction force for muscle fatigue caused by sustained isotonic contraction. The subjects of this study were 45 healthy students. They were divided into transcutaneous electrical nerve stimulation group(n=15), self-stretching group(n=15) and functional massage group(n=15), and using Primus RS. We observed the pattern of changes in maximal voluntary isometric contraction force(MVIC) after causing muscle fatigue in quadriceps femoris muscle through sustained isotonic contraction. Maximal voluntary isometric contraction force(MVIC) were greatly increased after transcutaneous electrical nerve stimulation, self-stretching and functional massage. In the comparison of recovery rate of muscle contraction force for muscle fatigue caused by sustained isotonic contraction among the treatment groups, it did not show any significant differences. However, it showed that each treatment may be effective in recovery of muscle fatigue caused by sustained isotonic contraction.

• The Journal of Korean Physical Therapy
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• 제35권5호
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• pp.132-138
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• 2023

Purpose: This study compared the effects of the elastic resistance and general training for college Taekwondo athletes, and investigated the biomechanical ability and lower extremity function according to the movement speed of the knee joint. Methods: Twenty university student Taekwondo athletes participated voluntarily in this study. The subjects performed general resistance training for four weeks, followed by elastic resistance training for another four weeks. The biomechanical parameters during the fast and slow isokinetic conditions, Y-balance ability, and vertical jump ability were measured three times: before training, after general resistance training, and after elastic resistance training. Statistical analysis was performed under isokinetic conditions and the intervention effect. Results: The biomechanical ability differed significantly between fast and slow isokinetic conditions (p<0.05). An analysis of the training method revealed a significant difference in the maximum knee extension speed and the posterior-lateral direction of the Y-balance test (p<0.05). Conclusion: Elastic resistance training had a more positive effect on the functional task performance than biomechanical factors related to muscular strength compared to general resistance training. In addition, speed-related knee biomechanical information of subjects with strong physical abilities could be utilized in sports physiotherapy.

• 한국신경인지재활치료학회지
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• 제10권2호
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• pp.27-34
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• 2018

목적: 뇌졸중 환자의 인지활성화를 위한 과제 훈련이 상지기능 및 일상생활동작에 미치는 영향을 알아보고, 재활 치료 시 중재를 제언하고자 한다. 방법: 2018년 1월부터 2월까지 뇌졸중 환자 9명을 대상으로 4주 동안 주 5회 30분씩 중재하였다. 실험군은 5가지 과제를 치료사의 언어적 가이드를 통해 환자가 인지전략을 사용하도록 유도하고 환자 스스로 생각하고 말하는 과정을 통해 과제수행의 문제점을 해결하도록 하였다. 대조군은 상지근육과 관절의 경직을 감소시키기 위한 수동적 관절 가동 범위 운동과 도구를 이용한 능동적 관절 가동 범위 운동을 시행하였고, 근력운동으로는 일상생활활동에서 가장 많이 쓰이는 위팔 두갈래근, 위팔 세갈래근, 삼각근을 근력수준에 맞추어 실시하였다. 결과: 실험군에서 MBI는 최대 10점 향상되었고, K-AMPS의 운동기술은 최대 1.0 logit의 향상이 나타났으며 처리기술에서는 최대 0.6 logit의 향상이 나타났다. MFT에서는 최대 2점의 향상이 나타났다. 대조군에서 MBI는 최대 5점 향상되었고, K-AMPS의 운동기술은 최대 0.2 logit의 향상 나타났으며 처리기술에서는 최대 0.3 logit의 향상이 나타났다. MFT에서는 점수 변화가 없었다. 결론: 뇌졸중 환자에게 인지활성화를 위한 과제 훈련이 상지기능 및 일상생활동작에 긍정적인 영향을 준다.

• 한국의류산업학회지
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• 제20권3호
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• pp.343-352
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• 2018

The objective of this study is to investigate the market of fitness compression wear as well as to design an optimal fitness compression wear by analyzing the muscle and movement characteristics of the elderly women in Korea. In this regard, research for functional garments is needed to increase muscle activity of elderly people during physical exercise. Firstly, we investigated the brand, design, size, material, and pattern of fitness wear based on the market survey. Secondly, we identified preference, evaluation items, evaluation method, and pattern design method based on the literature review. Finally, in addition, the motion type, range, angle to improve the muscle strength of the elderly were investigated and the maximum muscle strengths of each motion were analyzed by using 2007 Size Korea data (n = 386). It is also designed for muscle fatigue through exercise and rapid fatigue recovery after exercise. The evaluation methods for fitness compression wear were classified as motor functionality, physiological comfort, pattern and material suitability evaluations. The muscle strength at leg (pushing force) and waist (lifting force) of the ages of 60 to 69 years old showed 239.3 N and 274.5 N, respectively, which were the lowest forces compared to younger age groups. By applying these results to the design process of fitness wear, it is anticipated that the fitness wear will have a proper fit to the body shape of elderly people in South Korea as well as it can increase muscle efficiency to promote physical capability and healthy life for senior people.

• 한국전문물리치료학회지
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• 제14권3호
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• pp.41-47
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• 2007

Dance movements consist of combinations of movements such as jumping, rotation, maintaining balance, leg lifts, and plantar flexion with toe shoes. Dance movements require great muscle strength of lower extremities as well as muscular endurance. The purposes of this study were to investigate correlation between the anthropometric variables and the peak torque in young female dancers and to identify variables that affect isokinetic peak torque. Twenty-six female dancers ($19.7{\pm}1.2$ years of age) performed concentric maximum force efforts on the knee extensors and flexors at $60^{\circ}/sec$ and $120^{\circ}/sec$, the ankle plantar flexors (PF) and dorsiflexors (DF) at $30^{\circ}/sec$ and $120^{\circ}/sec$. Antropometric variables such as age, height, weight, body mass index (BMI), thigh girth, calf girth and duration of dance training were measured. To identify antropometric variables related to muscle strength, Pearson correlations were computed and a stepwise multiple regression analysis was performed. Pearson correlation coefficients of Knee extensor at $60^{\circ}/sec$ and $120^{\circ}/sec$ revealed moderate positive associations with BMI and thigh girth. Pearson correlation coefficients of ankle PF revealed low-to-moderate positive associations with height. Ankle DF also revealed moderate positive associations with BMI and calf girth. The main predictor variables of knee extensor at 60/sec, were stepwise multiple regression, age, height, thigh and girth.