K지역 운동선수들의 운동 종목과 등속성 무릎 근력 수준이 등속성 최대토크각에 미치는 영향

이종백,박규민 한국코칭능력개발원 2023 코칭능력개발지 Vol.25 No.5

본 연구는 등속성 무릎 근기능 검사 중 최대토크각와 종목, 근력수준과의 관계를 분석하여 선수들의 훈련과 재활의 기초자료로 활용하는데 있다. K지역 13개의 운동종목 총 134명의 남자 일반(38명), 대학부(60명), 고등부(34명) 운동선수들을 대상으로 신체조성과 함께등속성 무릎근력과 근파워의 최대토크각을 평가하였다. 최대토크각은 종목과 근력수준별 상호작용, 근력과 근파워 상호관계를 분석하였다. 첫째, 운동종목과 근력수준은 등속성 무릎 최대토크각과 상호작용효과가 있었으며, 운동종목은 좌ㆍ우측 굽힘근과 폄근의 최대토크각과(p<.05), 근력수준은 우측 굽힘근의 최대토크각과 유의한 상호작용효과가 있었다(p<.05). 둘째, 좌ㆍ우측 등속성 굽힘근 최대근력토크각과 최대파워토크각은 등속성 굽힘근(p<.001)과 유의한 상호관계가 나타났으며, 우측 굽힘근 최대파워토크각의 경우 우측 굽힘근 근파워(p<.01), 좌측 폄근 최대근력토크각은 좌측 근력과 근파워 모두와(p<.05) 유의한 상호관계가 나타났다. 본 연구의 결과는 종목과 근력수준이 최대토크각에 일정부분 영향을 미치는 경향이 있었다. 이는 선수들의 종목특성에 따른 등속성 근력 평가에 있어서 최대토크각에 대한 고려가 필요하다는 것을 시사하며, 훈련평가와 부상 후 재활에 있어서 이러한 정보가 선수들의 경기력 향상에 도움이 될 수 있을 것으로 사료된다. The purpose of this study was to analyze the angle at peak torque during the isokinetic knee muscle function test and analyze the relationship between the event and muscle strength level to use as basic data for training and rehabilitation of athletes. A total of 134 male general (38), college (60), and high school (34) athletes from 13 events in K-region were evaluated for isokinetic knee strength and angle at peak torque angle of muscle power along with body composition. For the peak torque angle, the interaction by event and muscle strength level, and the correlation between muscle strength and muscle power were analyzed. First, exercise event and muscle strength level had an interaction effect on isokinetic knee maximum torque angle, exercise event was both left and right (p<.05), and muscle strength level only had a significant interaction effect on the right flexor muscle. (p<.05). Second, in the analysis of the correlation between isokinetic muscle strength, muscle power and maximum torque angle, the left and right isokinetic muscle strength torque angle and maximum power torque angle showed a significant correlation with the isokinetic flexor muscle (p<.001). In the case of the right flexor maximum power torque angle, the right flexor muscle power (p<.01), and the left extensor maximum muscle power torque angle showed a significant correlation with both left muscle strength and muscle power (p<.05). The results of this study tended to have a certain effect on the peak torque angle by the event and strength level. This suggests that it is necessary to consider the peak torque angle in the evaluation of isokinetic muscle strength according to the characteristics of athletes, and it is believed that this information can help improve athletes' performance in training evaluation and rehabilitation after injury.

여대생의 근력 비대칭성의 특성

김창선 한국생활환경학회 2019 한국생활환경학회지 Vol.26 No.4

The characteristics of asymmetry in muscle strength of female college students are still unknown. This study aims to evaluate of characteristics of asymmetry in muscle strength. Both methods of isometric and isokinetic maximal muscle strengths of elbow and knee joints were measured in fortyfour female college students. In dominant/nondominant difference, isometric maximal muscle strength and isokinetic muscle endurance of dominant in the flexion of elbow joint were approximately 9% and 14% higher than those of the non-dominant, respectively(p<.05, p<.01), but there was no difference in the knee joints. The dominant/non-dominant ratio(DNDR) of isokinetic muscle endurance strengths in the elbow were approximately 1.2 times higher than those of isometric strengths. In flexion/extension difference, the isometric flexor strength were approximately 17% and 31% higher than those of the extensor strength in the elbow joint, respectively(p<.05, p<.01). In the knee joint, the flexor strengths of all measured muscle were consistently approximately 48~56% lower than those of the extensor strength. There was no significant difference between competition muscle strength ratio(CMSR) of each muscle strengths in the knee. These results suggested that differences of DNDR and CMSR among measured muscle strengths more appear in the elbow than in the knee joint.

A Study on the correlation between muscle strength and muscle activity on Shoulder motion of upper body

Jaesoo Hong,Joohyun Sim,Jonghyun Kim,Keyoungjin Chun 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5

Objective: This study is aimed at estimating each muscle strength and EMG in flexion-extension and abduction-adduction motions while exercising the upper body and specifying the correlation between each agonist muscle activity and muscle strength. Method: Based on the previous studies, this research has selected the 10 upper- body muscles that are related to flexion-extension and abduction-adduction motions. Muscle strength and its activity have been measured during an experiment in synchronizing an Isokinetic dynamometer and an EMG. Pearson correlation coefficient has been used for an analysis about the correlation between the muscle strength and muscle activity. Results: 1. The agonists in flexion include: Upper Trapezius, Anterior deltoild, Middle deltoild, Biceps, Pectoralis major clavicular insertion. The agonists in extension include: Posterior deltoid, Tricep long, Infraspinatus, Latissimus Dorsi. The agonists in abduction include: : Upper Trapezius, Anterior deltoild, Middle deltoild, Biceps, Pectoralis major clavicular insertion. The agonists under adduction include: Tricep long, Pectoralis major sternal insertion, Latissimus Dorsi, Pectoralis major clavicular insertion. 2. The results of an analysis of correlation between muscle strength(Nm) and muscle activity(%MVC) in 4 motions(flexion, extension, abduction and adduction) were as follows: ① The result of flexion is significant correlation (acoefficient of correlation: 0.573**), ② The result of extension is weak correlation (0.387*), ③ The result of abduction is significant correlation (0.428*), ④ The result of adduction is significant correlation (0.693**). Conclusion: This research has analyzed the correlation between each agonist muscle activity and muscle strength in the four motions. The results between mean value of agonists' muscle activity and shoulder's muscle strength showed significant correlation but the correlation between each agonist and muscle strength was not showed.

8주간 케틀벨 훈련이 중학교 남자축구선수의 기초체력 및 하지 등속성 근기능에 미치는 영향

윤대영(Yoon, Dae-Young),김주영(Kim, Joo-Young),성동준(Sung, Dong-Jun),권태동(Kwon, Tae-Dong) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.6

Kettlebell are kettle-shaped exercise tools. Recently, they have been used broadly in muscular strength and conditioning programs for athletes, and fitness programs for non-athletes. However, there is still a lack of research on the use of kettlebell by adolescent athletes. Thus, this study aimed to examine the effects of 8 weeks of kettlebell training on physical fitness and isokinetic muscle strength of lower extremity in male middle-school soccer players. A total of 16 male middle-school soccer players participated in this research, and they were randomly divided into an kettlebell training group (n=8) and control group (n=8). The effects of kettlebell training on physical fitness were measured by strength, muscular endurance, flexibility, quickness, and cardio-respiratory endurance, and the effects on isokinetic muscle strength of lower extremity were measured by extensor and flexor muscle strength. The kettlebell training group performed kettlebell training 3 times per week for 8 weeks, and the control group underwent other training and mini-games for physical fitness. After 8 weeks of kettlebell training, the study results showed a significant interaction effect between group and time on muscular endurance (p<.01). However, there was no significant interaction effect between group and time on strength, flexibility, quickness, and cardio-respiratory endurance (p>.05). Regarding isokinetic muscle strength of lower extremity, there was a significant interaction effect for the left and right flexor muscle after 8 weeks of kettlebell training (left: p<.05; right: p<.01). However, there was no significant interaction effect for left and right extensor muscle strength (p>.05). In conclusion, kettlebell training was effective to increase muscular endurance and left and right flexor muscle strength in male middle-school soccer players. The results of this study will be helpful for soccer coaches and trainers when they construct training programs.

요부안정화 운동이 만성요통여성 환자의 근활성도와 등속성 근력에 미치는 영향

방현수 ( Hyun Soo Bang ) 대한물리의학회 2015 대한물리의학회지 Vol.10 No.2

PURPOSE: The purpose of this study to investigate the effects of exercise on lumbar stabilization in muscle activity and isokinetic muscle strength of female with chronic low back pain. METHODS: The candidates was chose to twenty women in their 30s and 40s complaining back pain for over 12 weeks and consist of 10 people for lumbar stabilization and general physical therapy group(PL group), another 10 people for general physical therapy group(GP group). Lumbar stabilization exercise was conducted for 8 weeks and was comprised of 60 minutes for two times a week. In order to examine the effects of lumbar stabilization, results in the present study were analyzed maximal voluntary isometric contraction (MVIC) using electromyogram to measure muscle activity and isokinetic performance including peak torque and average power at the pre to post. RESULTS: The following are results in this study. The MVIC and isokinetic muscle strength were gradually increased in all group. As the result of the test of the MVIC and isokinetic muscle strength, the difference of lumbar stabilization and general physical therapy group is statistically more significant than that of general physical therapy group. CONCLUSION: In the present study, results indicate that lumbar stabilization helps to improve the muscle activity and isokinetic muscle strength.

Specific Fitness Profiles through Analysis of the Correlation between Anaerobic Power, Maximal Strength, and Isokinetic Strength in Korean National Snowboarders

( Dong Hyun Yoon ),( Kwang-jun Kim ) 한국스포츠정책과학원 2021 International Journal of Applied Sports Sciences Vol.33 No.2

Purpose: We examined the associations between anaerobic power, maximal strength, and isokinetic strength in Korean National snowboarders.Methods: We examined cross-sectional associations between isokinetic trunk strength in 89 Korean National snowboarders (mean age: 22.17 ± 4.82 years). The main outcome measures were the Wingate anaerobic power test, maximal strength test, and isokinetic knee strength test.Results: Isokinetic trunk strength was correlated with anaerobic power (lower average power, peak power, and power-drop rate). Further, trunk strength flexion and extension were significantly associated with maximal strength (knee strength and one-repetition maximum).Conclusions: The Korean national snowboarders’ anaerobic capacity and maximal muscle strength measurements were positively associated with their isokinetic trunk strength. Further research is needed to elucidate the core balance and muscle-growth mechanisms underlying this association; ideally, future studies will involve exercise and treatment interventions to identify causal relationships.

엘리트 수구 선수들의 Body Action Therapy 프로그램이 전신 가동성 및 근 긴장도, 등속성 근력에 미치는 영향

주윤숙,김현태 한국체육대학교 체육과학연구소 2022 스포츠사이언스 Vol.40 No.1

This study examined the effects of body action therapy program on whole body mobility, muscle tone, and Isokinetic muscle strength for eight weeks for Water Polo Athletes. The purpose is to investigate the possibility of water polo Athletes using rehabilitation programs to prevent injuries. In order to examine the body shape of the Water Polo Athletes, Body shape analysis (exbody 670), Mechanical properties of muscles (Myoton PRO), and Isokinetic muscle strength (Humac-NORM) were measured. As a result of the study, there was a significant change in the interaction effect of each treatment period between groups(p<.01) in Apley's Scratch Test-R in systemic mobility. It was confirmed that there was a significant difference between groups(p<.001) and treatment period(p<.001) in the somatic cave. During body shape analysis, the postmortem of the experimental group was requiring an examination every 3 months. The control group is post-mortem, which requires close examination and prescription. In the mechanical properties of the muscles, there was a significant difference in the interaction effect of the Deltoid by treatment period between groups(p<.001). In terms of muscle stiffness, there was a significant difference in the interaction effect of each treatment period between groups(p<.001) in the Trapezius and Tibialis anterior. In terms of elasticity, Trapezius there was a significant difference in the interaction effect of each treatment period between groups(p<.001). When it comes to Isokinetic muscle strength there was a significant difference in the interaction effect of each treatment period between groups (p<.001) at an angular velocity of 60°/sec flexural muscle strength. Based on this, the application of the Body Action Therapy program is expected to help prevent injuries and rehabilitate if intensive training is applied to Water Polo Athletes to improve muscle strength during the off-season.

등속성 근관절 기능과 근피로도에 근거한 사이클 선수의 근력 불균형 및 페달링 파워에 관한 연구

강영석(Kang, Young-Seok),김정훈(Kim, Jung-Hoon) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2

The main purpose of this study was to investigate bilateral muscle imbalance based on isokinetic muscle strength in knee and muscle fatigue in elite cyclists observed by electromyographic analysis measured on Wingate test. In doing so, we also found out the corelationship between isokinetic muscle strength and pedaling power. Six elite cyclists were recruited and isokinetic knee and lumbar extension and flexion were measured at 60 degree per sec and muscle fatigue pattern during Wingate test was analyzed to see if any muscle asymetry exists between dominant and non-dominant muscle strength. As a result paired t-test, there was no difference in muscle strength in knee extension and flexion between dominant and non-dominant even though subtle difference in terms of Limb Symetry Index (LSI) was observed. No difference in muscle fatigue pattern in dominant and non-dominant leg observed in Wingate test. Therefore, cyclists involved in cyclic exercise in which right and left limb are relatively uniformly recruited tend to have less or little muscle asymetry between dominant and non-dominant limb.

노인 근력 특성 및 체성분과의 관계

최동성 ( Dong Sung Choi ),전용관 ( Justin Y Jeon ),원영신 ( Young Shin Won ),이해동 ( Hae Dong Lee ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.3

The purpose of this study was to investigate the relationship among isometric and isokinetic muscle strength, lean body mass(LBM) and bone mineral density(BMD) in the elderly. Eleven males(age, 70.27±5.78yr; height, 167.36±6.68 cm; weight, 68.34±8.23 kg) and thirteen female(age, 69.77±4.13yr; height, 152.80±4.45 cm; weight, 56.86±7.40 kg) participated in this study. In all subjects, LBM and BMD segments was measured by using Dual-energy x-ray absorptiometry(DEXA, Lunar DPS-DM, U.S.A.). Maximum isometric and isokinetic muscle strength of flexion and extension at the knee and elbow, ankle, trunk joints were measured by using an isokinetic dynamometer(CON-TREX(R) Multi Joint Testing Module, Switzerland). The results of this study showed that isometric and isokinetic muscle strength was significantly higher in extension than flexion. In the male and female, hamstring to quadriceps strength ratio(H:Q ratio) was increased as contraction velocity increased. BMD was correlated significantly with trunk extension in the male, but not in the female. LBM was correlated significantly in the male and female with knee extension strength. This study suggests that in the elderly muscle strength training program should put more weight on extensor muscles of the body.

사이클 선수 대퇴사두근의 근육 두께와 등속성 근력의 상관관계

이형진,이용우 한국스포츠학회 2019 한국스포츠학회지 Vol.17 No.4

The human muscle structure, according to the characteristics of the sport, is directly related to muscle strength. However, studies that reveal a correlation between muscle structure and strength based on the anatomical characteristics of the muscles are lacking. Therefore, the aim of this study was to compare the thicknesses of the quadriceps femoris muscle of short- and long-distance cyclists using ultrasonography and to determine the correlation between muscle thickness of the quadriceps femoris and isokinetic knee extension strength. The thicknesses of the quadriceps femoris (rectus femoris, vastus medialis, vastus lateralis, and vastus intermedius) were measured using ultrasonography, and isokinetic knee extension strength (peak torque, % BW; total work) was measured at an angular velocity of 60o/sec (5 repetitions), 180o/sec (10 repetitions), 300o/sec (20 repetitions) using CSMI. The muscle thickness of the rectus femoris was thicker in short-distance cyclists than in long-distance cyclists (p<.05). There was a significant relationship between the muscle thickness of the rectus femoris and peak torque of isokinetic knee extension strength at an angular velocity of 180o/sec (p<.05). A detailed strengthening training method (e.g. rectus femoris strengthening) would improve cyclist performances rather than any suggested comprehensive strengthening training of the quadriceps femoris. 종목의 특성에 따른 인체 근육구조는 근력과 직접적인 연관성이 있으며 근육의 형태분석 연구는 경기력 향상에 큰 영향을 미치는 것으로 알려져 있으나 국내에서는 종목을 불문하고 경기력 향상을 위해 근육의 해부학적 특징을 기초로 한 근육의 구조와 근력의 상관관계 연구가 미비한 실정이다. 따라서 본 연구에서는 사이클 선수 (단거리, n=5; 장거리, n=7)을 대상으로 초음파 영상장비를 이용하여 사이클 단거리 및 장거리 선수 집단 간 대퇴사두근의 두께를 비교 및 분석하고 등속성 근력과의 상관관계를 구명하였다. 대퇴사두근 (대퇴직근, 내측광근, 외측광근, 중간광근)의 두께를 초음파 영상장비를 이용하여 촬영 및 계측하였으며 슬관절 (knee joint)의 굴근과 신근의 등속성 근력을 CSMI (Humac Co. USA)를 이용하여 측정하였다. 측정 시 각속도 60°/sec에서 5회, 180°/sec에서 10회, 300°/sec에서 20회 실시하였으며 체중 당 최대근력(peak torque, %BW)과 총 일량(total work, %BW) 등을 분석한 결과, 대퇴직근의 근육두께에서 사이클 단거리 선수 집단이 장거리 선수 집단보다 유의하게 두꺼운 것으로 나타났다 (p<.05). 또한, 대퇴직근은 180°/sec 각속도에서 측정한 슬관절 신근의 등속성 근력 (최대근력)과 높은 상관관계를 나타내었다 (p<.05). 경기력 향상을 위해 하체 전체의 포괄적인 근력 향상 훈련방법 제안이 아닌 근육을 선택적으로 향상하는 세분된 훈련방법 (예: 대퇴직근 강화 훈련)이 제시된다면 사이클 선수의 경기력을 향상하는데 더욱 도움을 줄 수 있을 것으로 사료된다.