• 한국운동역학회지
• /
• 제22권2호
• /
• pp.201-208
• /
• 2012

The purpose of this study was to investigate the effect of leg extension exercises performed on outdoor resistance exercise machines on knee extension muscle strength and quadriceps muscle group cross sectional area (CSA) in elderly women. Two groups were recruited for this study, including an exercise group (EG: n=13, $71.38{\pm}2.79$ yrs) and a control group (CG: n=5, $73.4{\pm}5.94$), In all subjects, maximum isometric and isokinetic muscle strength of knee flexion and extension were measured using an isokinetic dynamometer (Cybex(R) Humac Norm Testing & Rehabilitation System, USA). Quadriceps muscle group CSA were measured using MRI (Philps, Intera 1.5 T, NE Netherlands). The results of this study showed that post-intervention isometric knee extension peak torque value were higher than pre-intervention measures in the EG. However, the EG did not show improvement in quadriceps muscle group CSA, Also, no differences in the shift of optimal knee joint angle were observed between pre and post-intervention exercise. Outdoor leg extension exercise showed small increases in muscle strength in comparison to other resistance training exercises. The results of this study suggest that because outdoor leg extension exercise machines lack a progressive loading mechanism, significant increases in muscle strength may not be obtained.

• 한국전문물리치료학회지
• /
• 제29권4호
• /
• pp.262-268
• /
• 2022

Background: Virtual reality (VR) programs based on motion capture camera are the most convenient and cost-effective approaches for remote rehabilitation. Assessment of physical function is critical for providing optimal VR rehabilitation training; however, direct muscle strength measurement using camera-based kinematic data is impracticable. Therefore, it is necessary to develop a method to indirectly estimate the muscle strength of users from the value obtained using a motion capture camera. Objects: The purpose of this study was to determine whether the pedaling speed converted using the VR engine from the captured foot position data in the VR environment can be used as an indirect way to evaluate knee muscle strength, and to investigate the validity and reliability of a camera-based VR program. Methods: Thirty healthy adults were included in this study. Each subject performed a 15-second maximum pedaling test in the VR and built-in speedometer modes. In the VR speedometer mode, a motion capture camera was used to detect the position of the ankle joints and automatically calculate the pedaling speed. An isokinetic dynamometer was used to assess the isometric and isokinetic peak torques of knee flexion and extension. Results: The pedaling speeds in VR and built-in speedometer modes revealed a significantly high positive correlation (r = 0.922). In addition, the intra-rater reliability of the pedaling speed in the VR speedometer mode was good (ICC [intraclass correlation coefficient] = 0.685). The results of the Pearson correlation analysis revealed a significant moderate positive correlation between the pedaling speed of the VR speedometer and the peak torque of knee isokinetic flexion (r = 0.639) and extension (r = 0.598). Conclusion: This study suggests the potential benefits of measuring the maximum pedaling speed using 3D depth camera in a VR environment as an indirect assessment of muscle strength. However, technological improvements must be followed to obtain more accurate estimation of muscle strength from the VR cycling test.

• International Journal of Internet, Broadcasting and Communication
• /
• 제15권4호
• /
• pp.294-303
• /
• 2023

This study was to find out the differences in self-esteem, body composition, and muscle strength of middle-aged women, and nine physical labor groups were selected as beautification workers at D University in Cheonan, and a total of 17 were selected as non-physical labor groups were 8 full-time housewives living in Cheonan. After selecting the subjects, the subjects arrived 30 minutes before the start of the experiment and completed the self-esteem questionnaire. After taking the stability, the measurement was carried out in the order of body composition, grip strength, and isokinetic muscle function, and the independent sample t-test was conducted. First, middle-aged women's self-esteem according to the type of physical labor was high in the physical labor group in relation to others among the sub-factors. Second, there was no significant difference in body composition according to the physical labor patterns of middle-aged women. Third, there was no significant difference in lower limb isokinetic muscular strength according to the types of physical labor of middle-aged women. Third, there was no significant difference in lower limb isokinetic muscular strength according to the types of physical labor of middle-aged women. The self-esteem according to physical labor is caused by the sense of belonging in the workplace, and the difference between body composition and muscular strength is insignificant. Therefore, it is necessary to introduce a physical activity program to promote self-esteem due to aging and prevent physical deterioration regardless of occupation.

• 한국산학기술학회논문지
• /
• 제14권1호
• /
• pp.229-238
• /
• 2013

본 연구는 대학 엘리트 카나디언 선수들의 등속성 근기능을 검사 및 진단하여 선수들의 기능 향상 및 상해예방을 위한 훈련 방법론에 대한 조언을 하고자 함에 목적이 있다. 경주 소재 D 대학의 평균 8.5년의 경력을 가진 8명의 엘리트 선수들이 실험에 참가했으며, Biodex system III, Biodex stabilizer system, THP 2, Inbody 720이 근기능 검사(peak torque, average power, work fatigue), 동적 균형 검사, 신체성분 검사를 위해 사용되었다. 등속성 근기능 검사는 어깨와 허리, 무릎 관절에 대하여 실시하였으며, 측정 후 동측 불균형과 좌 우측 불균형 정도를 평가하였다. 검사 결과 A3, A4, A5, A6, A8 선수는 어깨의 근력과 파워 훈련이, A1, A2, A7, A8 선수는 어깨의 근지구력 훈련이 필요한 것으로 평가되었다. A2, A5, A8 선수는 허리의 근력과 파워 강화 훈련이 필요하였고, A1, A8 선수는 허리의 근지구력 강화 훈련이 필요하였다. 대부분의 선수들은 무릎과 허리의 동측 근력비가 정상적이지 못했는데, 이의 개선을 위해 A2, A3, A4, A8 선수는 복근의 강화가 필요했고 A3, A5, A6, A7, A8 선수는 햄스트링의 강화가 요구되었다. 선수들의 BMI 평균은 24.90 $kg/m^2$, 체지방율은 12.23%, 반응시간 평균은 324 msec, 밸런스 점수는 각각 2.0 미만으로 나타났다. 이러한 결과를 종합해 볼 때, 카나디언 엘리트 선수들은 근력 불균형에 의한 경기력 저하와 상해 잠재 위험성이 있으므로 정기적인 근기능 검사를 통한 관리와 함께 적절한 훈련 처방이 필요할 것이라 생각된다.

• The Journal of Advanced Prosthodontics
• /
• 제5권4호
• /
• pp.388-395
• /
• 2013

PURPOSE. The purpose of this study was to estimate the effects of occlusal stability to identify action mechanisms of mouthguards, known to have a modulatory effect on limb muscle function. MATERIALS AND METHODS. This study included 20 male subjects to perform the isokinetic muscle tests and the Wingate anaerobic power test on both knee joints under five closed-mouth conditions: without or with 4 types of mouthguards with thickness of 2 mm based on premolar area: (1) full-coverage, (2) anterior partial-coverage, (3) right posterior partial-coverage, and (4) left posterior partial-coverage. The obtained results were subjected to One-way ANOVA with repeated measures, followed by post hoc test of the contrast method (${\alpha}$=.05). RESULTS. There was no significant difference between the closed position with and without a full-coverage mouthguard in all variables. However, significant differences were observed between with and without a partial-coverage mouthguard in muscular endurance during extension of the left knee, muscular power and endurance during flexion of the right knee. Additionally, significant differences were found between occlusal states with full- and partial-coverage mouthguards in muscular power and endurance during extension of the left knee. CONCLUSION. These findings indicate the elevation of vertical dimension by 2 mm or the inducement of occlusal stability had little effect on isokinetic muscle strength and anaerobic performance, while uneven distribution of occlusal force might have some positive effects.

• 한방재활의학과학회지
• /
• 제18권4호
• /
• pp.147-159
• /
• 2008

Objectives : In order to investigate the relation of body composition analysis and isokinetic trunk muscle strength for the screening test of low back pain. Methods : This study was carried out with the data from comprehensive medical testing. 75 subject aged 20-59 performed the segmental bioelectrical impedance analysis, isokinetic trunk muscle strength test and questionnaire. Then we analyzed the relationship of data. Results : Low back pain(LBP) prevalence in high obesity index(Body mass index(BMI), Percentage of Body Fat(PBF), Waist Hip Ratio(WHR)) group was higher than LBP prevalence in normal obesity index group(p<0.001). In LBP group, Extension Peak Torque(Ext.PT), Extension Peak Torque per Body Weight(Ext.PT/BW) were significantly lower than Non-LBP group(p<0.001). And 90% of LBP group indicated abnormal Extension-Flexion Ratio(E/F ratio)(1.0 < Normal E/F ratio <1.6). When it comes to analyze relation between obesity index and muscle strength, Ext.PT/BW was significantly decreased according to PBF, WHR score. And correlation coefficient in Flex.PT, Flex.PT/BW, Ext.PT, Ext.PT/BW and PBF showed decreasing function. Conclusions : Results from this investigation showed positive correlation between obesity and LBP prevalence. Decreased muscle strength and inbalanced E/F ratio were shown in LBP. Trunk muscle strength was changed according to body mass composition parameters. This results are expected to contribute to prevent and diagnose LBP by application the clinical index of body composition analysis.

• 한국산학기술학회논문지
• /
• 제21권12호
• /
• pp.162-169
• /
• 2020

본 연구는 고등부 씨름 선수들을 대상으로 체급별 기초·전문체력의 차이를 알아보는데 목적이 있다. 측정기간은 2019년 11월 25일-12월4일이며, 총 28명의 고등부 씨름 선수(80kg이하 7명, 90kg이하 8명, 90kg이하 7명, 100kg이상 6명)를 대상으로 체급별 기초·전문 체력요인(근력, 근파워, 민첩성, 무산소성파워, 유산소능력, 유연성, 등속성근기능)을 측정하여 비교·분석하였다. 자료처리는 SPSS 23.0을 활용하여 one-way ANOVA와 Duncan을 실시하였다. 그 결과 첫째, 악력과 팔굽혀펴기, 서전트점프, 제자리멀리뛰기, 체후굴, 체전굴, 사이드스텝, 반응시간에서 체급별 차이가 나타나지 않았다. 둘째, 배근력에서 100kg 이하인 그룹이 100kg 이상인 장사급보다 유의하게 낮게 나타났으며, 윗몸일으키기와 20m 셔틀런에서 장사급보다 유의하게 높게 나타났다. 셋째, 무산소성 최고파워와 평균파워의 상대적인 값은 100kg 이하인 그룹이 100kg 이상인 장사급보다 유의하게 높게 나타났다. 넷째, 등속성근기능의 경우 허리 신전/굴곡력과 무릎 관절의 우측 신전근력, 그리고 좌우측 굴곡근력에서 체급별 차이가 없었다. 본 연구 결과에서 얻은 결론은 고등부 씨름 선수의 경우 근파워, 유연성, 민첩성 그리고, 체중당 무산소성 평균파워와 등속성 허리근력, 무릎굴근력에서 체급에 따른 차이가 없다는 것을 확인할 수 있었다.

• 한국융합학회논문지
• /
• 제13권5호
• /
• pp.307-312
• /
• 2022

본 연구에서는 종아리 근육에 기능성 의류를 착용한 것이 종아리의 근기능에 어떤 영향을 미치는지 규명하고 기능성 의류가 종아리 근기능 증가에 활용가치가 있는지 검증하고자 하는데 그 목적이 있다. 연구의 대상은 하지에 이상이 없는 B 대학교의 남학생 21명을 대상으로 측정 하였다. 측정방법은 등속성근기능측정기인 CSMI사의 Humac Norm을 이용하여 오른쪽, 왼쪽 종아리에 기능성 의류 착용 전, 후 각속도 30°/sec, 120°/sec로 측정하였다. 피실험자들이 기능성 의류를 착용했을 때와 착용하지 않았을 때를 측정 해본 결과 발목 배측굴곡(Dorsi flexion)에서는 기능성 의류를 착용했을 때와 착용하지 않았을 때 유의한 차이가 나타나지 않았으나, 발목 저측굴곡(Plantar flexion)에서는 기능성 의류를 착용하였을 때 근력, 근파워, 근지구력이 유의하게 증가하는 것으로 나타났다. 따라서 종아리의 기능성 의류 착용이 운동기능 향상에 긍정적 효과가 있으며, 향후 연구에서는 대회를 앞두고 훈련을 하는 선수에게 기능성 의류를 착용한 인원과 착용하지 않은 인원의 근기능 향상정도를 비교해보는 연구를 제시하는 바이다.

• 한국운동역학회지
• /
• 제22권1호
• /
• pp.9-16
• /
• 2012

The purpose of this study was to compare and analyze muscle function and EMG of the trunk and the lower extremity in short and long distance athletes and in order to determine difference in peak torque per unit weight, muscle power per unit weight, endurance ratio, and %MVIC classified by muscle. For that purpose, isokinetic muscle function tests for waist, knee, and ankle joints and EMG measurements for the trunk and the lower extremity muscle with running motion were conducted for 7 short and long distance high school athletes respectively. The study over muscle function of waist, knee, and ankle joints indicates that peak torque per unit weight of short distance athletes is higher than that of long distance athletes in extension and flexion of waist joint, plantar flexion of right ankle joint, and dorsi flexion of left ankle joint. In case of the muscle power per unit weight of short distance athletes is also higher than long distance athletes in waist, knee, and ankle joints. No difference in endurance ratio of waist, knee, and ankle joints between the two groups was founded. The results of the test over EMG of the trunk and the lower extremity show that %MVIC of erector spinae, rectus femoris, vastus medialis, vastus lateralis, and tibialis anterior is higher than that of long distance athletes in support phase. The above results proved to be the same in flight phase except for %MVIC of medial gastrocnemius. In other words, %MVIC of medial gastrocnemius for short distance athletes turned out to be higher than that of long distance athletes in flight phase.

• 한국산학기술학회논문지
• /
• 제17권2호
• /
• pp.37-44
• /
• 2016

이 연구는 고령화 사회를 대비하여 노인 체력 향상 프로그램 설계 및 관련 정책을 수립하기 위한 기초 자료를 수집하기 위한 목적으로 실시되었다. 이를 위해 2013년, 서울 동대문구 소재 노인종합복지관에 등록 중인 노인 52명과 동대문구 소재 대학교 학부 과정에 재학 중인 학생 46명을 연구 대상으로 하여 하지의 등속성 근기능과 발목 관절가동범위, 유연성, 균형성 및 신체조성 등을 측정하였으며, Biodex system IV, Biodex stabilizer system, CNP-5403, Inbody 3.0이 사용되었다. 남자 노인 집단의 평균 연령은 77.13세였으며, 45.85kg의 근육량을 가지고 있었고, 체전굴은 2.97cm로 유연성이 아주 결여되어 있었다. 좌측발의 균형 능력이 우측보다 좋지 않았으며, 발바닥쪽굽힘의 관절 가동 범위는 35도 내외로 정상 범위에서 벗어났다. 전반적인 무릎 폄근과 굽힘근의 근력은 남자 대학생의 50% 정도 수준이었으며, 뒤넙다리근의 결손율이 18.55%로 균형이 깨어져 있었다. 발목 가쪽번짐-안쪽번짐 결손율 또한 23.08%, 19.19%로 나타났다. 여자 노인 집단의 평균 연령은 75.46세로 근육량은 35.68kg이었으며, 체전굴은 11.69cm로 여자 대학생 집단과 비슷하게 좋은 편이었다. 무릎의 동측 근력비가 좌우 모두 50% 미만이었고, 결손율 또한 폄 14.32%, 굽힘 19.73%로 좌우 근력 균형이 좋지 않았다. 발목의 발등굽힘력은 여자 대학생 집단의 62%(좌), 73%(우) 정도였다. 발등굽힘-발바닥쪽굽힘의 결손율이 각각 25.05%, 26.86%, 가쪽번짐-안쪽번짐 결손율이 19.97%, 21.09%로 나타나 발목의 좌 우 근력 불균형이 상당히 심한 것으로 나타났다. 상기 연구 결과들이 실질적인 노인 체력 향상 훈련 프로그램을 제공하고 관련 정책을 수립하는 데 도움이 되기를 바란다.