Structure-function Relationships that Determine Sprint Performance and Running Speed in Sport

( William F. Brechue ) 한국스포츠정책과학원(구 한국스포츠개발원) 2011 International Journal of Applied Sports Sciences Vol.23 No.2

Running speed is critical for sport performance and is the basis for sport selection. The 100 m sprint is the ultimate expression of running speed. As the 100 m sprint is the product of one-dimensional power, sport performance requires one-dimensional power and the translation of that power into change-of-direction power for performance. These would appear to be very different skills, yet the training techniques are largely similar. The purpose of this paper is to review the characteristics of 100 m sprint performance as related to running speed for sport performance and to explore the mechanical and physiological structure-function relationships that support these performance characteristics. Both sprinting and sport performance require great acceleration which depends heavily on muscular strength and power. Undoubtedly, muscle fiber type plays a critical role in determining running speed. However, muscle architecture, specifically muscle fascicle length and localized muscle distribution (muscle shape), appear to confer even greater performance specificity. Both sprinting and sport performance rely heavily on muscle-tendon stiffness for the efficient application of force for what is ultimately change-of-direction power, but with a different point of emphasis and outcome. While the energetic requirement for competition is significantly different, sprinters and sports performers have similar anaerobic and aerobic capacities suggesting an equivalent metabolic conditioning. Given the dependence of running speed on muscle force/power and similar training adaptations, resistance exercise training appears to be a specific analogue for sprint performance and is critical for improving running speed. Ultimately, it appears that the mechanical and physiological structure-function relationships are quite similar only applied in a different manner for speed and purpose. Gender and race differences in structure- function relationships result in some changes in emphasis for performance and for training.

탄성밴드를 이용한 저항운동이 여성 고령자의 평형성 및 보행기능에 미치는 영향

신승민(Seung Min Shin),안나영(Na Young Ahn),김기진(Ki Jin Kim) 한국발육발달학회 2006 한국발육발달학회지 Vol.14 No.3

The purpose of this study was to investigate the effect of elastic band resistance training on the improvement of balance ability, and gait performance in the elderly. Subjects were between 58 and 67 years of aged elderly women, and were divided into exercise group(n=10) and control group(n=10). The subjects for experimental group were participated in the elastic resistance training program for 8 weeks. Body composition, muscular function, balance ability, and gait performance test were measured, and data were compared using ANOVA with group and time, paired or independent t-test for post hoc. Significances for statistical analyses were set at p< .05. In body composition as body weight, BMI, LBM, and %Body fat, exercise group showed a positive change as compared to control group, but this change was not statistical significance. In balance ability, exercise group showed a positive effect after training, and one-leg stance of exercise group was a significant (p<.05) higher value than control group after training. In leg muscular endurance by leg chair squat test, exercise group was significantly increased(p<.05) after training. Cadence of temporal distance gait performance test showed a positive effect of training in exercise group. In conclusion, elastic resistance training has a very positive effect to improve balance ability, leg muscular endurance and gait performance.

대학 씨름선수의 체력 프로파일과 경기력 예측

박승한 ( Sung Han Park ),김규호 ( Kyu Ho Kim ),허용 ( Yong Huh ) 대한무도학회 2009 대한무도학회지 Vol.11 No.1

이 연구는 대학교씨름선수들을 각 체급별 체격과 체력 및 무산소운동능력, 등속성대퇴근력, 요부근력의 특성을 분석하고, 씨름선수들을 우수선수와 비우수선수로 구분하여 우수선수의 경기력 예측을 분석하는데 목적이 있다. 이러한 연구의 목적을 달성하기 위하여 체격과 체력 및 무산소운동능력, 등속성근력 측정은 대구경북·경남 지역의 대학교 씨름선수들 중 대한씨름협회에 등록된 선수들을 대상으로 동계 훈련 전에 측정을 하였으며 체급별로(7체급) 21명씩 전체 147명을 대상으로 하였다. 측정된 자료를 분석하기 위하여 일원변량분석(one-way analysis of variance; one-way ANOVA)을 실시하여 평균과 표준편차를 구하였으며 체급간 유의한 차이가 있는 경우 Scheffe의 사후검증을 하였다. 통계적 유의수준은 α=0.05로 하였다. 경기력 예측력을 구하기 위하여 로지스틱 회귀분석(logistic regression analysis)을 적용하여 입력방식(Enter)으로 하였으며 통계적 유의수준은 α=0.05로 설정하였다. 모든 체급이 높을수록 체격조건과 체력이 높은 수치를 나타냈으며, 등속성근력은 각 체급별로 굴근력 보다는 신근력이 높은 수치를 나타냈다. 우수선수를 예측할 수 있는 항목 중 체격은 신장, 체중, 흉위로 나타났으며 신체구성은 체지방, 비지방체중, WHR, BMI가 우수선수를 예측할 수 있는 항목으로 나타났다. 체력은 유연성과 악력(좌), 유산소능력으로 나타났으며 무산소운동능력은 평균파워와 피크파워가 우수선수를 예측할 수 있는 항목으로 나타났다. 결론적으로 대학교 씨름선수들을 대상으로 작성된 프로파일은 선수들의 훈련계획 및 운동처방에 활용될 수 있을 것이며 우수선수들을 예측할 수 있는 공식을 토대로 선수 발굴이나 선발에 유용한 준거 자료로 이용될 수 있을 것이다. This study measures college ssireum players` weight, physique, physical fitness, anaerobic power, thigh and trunk isokinetic strength and then correlates these measurements with player performance to search for predictive variables. These measurements are taken from 147 college Ssireum players. Ssireum players are profiled using one-way ANOVA and Scheffe`s method. Analysis of mean differences has a significance level of 0.05. Player performance predictions using logistic regression analysis also have a significance level of 0.05. Player measurements indicate that higher weight levels have higher physiques and physical fitness; also, isokinetic extension muscle strength exceeds isokinetic flexion strength. For higher performance players, predictive physique measurements include height, weight, chest circumference; predictive body composition measurements include body fat, leanness, waist-hip-ratio, and BMI; predictive physical fitness measurements include flexibility, left-hand grasping power, and aerobic ability; predictive anaerobic measurements include mean power and peak power. This study concludes that ssireum player profiles based on the above data can be used to tailor training plans and exercise prescriptions in addition to predicting future player performance.

Application of Functional Training for Improving the Performance of Male High School Freestyle WRESTLER

Jusik Park,Kijin Kim J-INSTITUTE 2021 Kinesiology Vol.6 No.2

Purpose: This study is a case study that analyzes the effects after planning and applying a functional training program to improve the performance of high school male freestyle wrestler. Methods: The subject of this study was one elite athlete in freestyle wrestling at K High School in D Metropolitan City. The contents of the applied functional training program consisted of 5 items related to flexibility, 5 items related to dynamic stabilization, 8 items related to muscular endurance, and 8 items related to muscle power improvement in consideration of the wrestling competition situation. After applying the functional training program twice a week at a frequency of 120 minutes per day for 5 weeks(10 times), changes in body composition, basic physical strength, maximal exercise load test, anaerobic exercise capacity, knee joint isokinetic strength and muscle power were analyzed. Results: Body composition, basic physical fitness, maximal exercise load test, anaerobic exercise capacity, isokinetic muscle strength and muscle power were measured before and after the application of functional training, and most of the measurement items showed positive changes after application of the program. In particular, a positive change in exercise duration and maximal oxygen intake as a result of the graded maximal exercise test indicates an improvement in cardiopulmonary endurance, and a decrease in peak drop among the anaerobic exercise capacity measurement items increases tolerance to fatigue. In addition, positive changes in knee joint isokinetic muscle strength and muscle power are very important physical factors for improving the wrestler s performance, and it is judged that the effect of the functional training program applied in this study is appropriately reflected. Conclusions: In summarizing the results of this study, the planning of the optimal functional training program taking into account the physical characteristics of the sport and individual athletes showed more developmental changes than the previous physical fitness training which depended on the intensity of training and the amount of training. This training method was considered to show the possibility of being fully utilized for the future improvement of elite athletes performance.

STC 트레이닝이 대학 유도선수의 Trunk 근 파워와 스피드 및 유도 운동 수행능력에 미치는 영향

현광석,박정민,김현준,정훈 한국스포츠학회 2022 한국스포츠학회지 Vol.20 No.1

This study was to investigate the effects of STC training on trunk muscular power and speed and judo exercise performance in university judo player. In order to achieve the purpose of this study, judo player at Y universict, were selected at random and allocated 14 judo player each for the Non Exercise group(NEG), Deficient Exercise group(DEG), Over Exercise group(OEG) and measured trunk muscular power and speed and judo exercise performance before and after the experiment. The STC training program for 12 weeks. The results of this study were as follows: First, As a result of analyzing the change of trunk muscular power according to STC training, OEG was significantly improved compared to NEG and DEG. Second, As a result of analyzing the change of trunk speed according to STC training, OEG was significantly improved compared to NEG and DEG. Third, As a result of analyzing the change of judo exercise performance according to STC training, OEG was significantly improved compared to NEG and DEG. As conclusions, this study confirmed that the STC training on trunk muscular power and speed and judo exercise performance in university judo player. However, there is a need for more specific exercise programs to be developed for the continual improvement of athletic performance in athletics along with further studies to confirm the physiological benefits of those programs. 본 연구의 목적은 STC운동이 대학유도선수의 Trunk 근파워와 스피드 및 유도 운동수행능력에 미치는 영향을 규명함으로써, 대학유도선수의 스포츠 손상 예방과 경기력 향상에 도움을 주고자 수행된 연구이다. 연구의 목적을 달성하기 위하여 C지역 대학 유도선수 36명을 비 운동 비교집단(NEG) 12명, 주 3회 미만 STC 운동그룹(DEG) 12명, 정상적인 STC 운동그룹(OEG) 12명으로 무선 할당하여 실험 전과 후 Trunk 근파워와 스피드 및 유도운동수행능력 변인을 측정하였다. STC 운동 프로그램은 12주간 진행하였으며, 연구 수행을 통해 얻어진 자료는 SPSS 24.0 통계 프로그램을 이용, 반복측정이원변량분석을 실시하였다. 결론은 첫째, STC 운동에 따른 Trunk 근파워와 스피드의 변화를 분석한 결과, OEG가 DEG와 NEG에 비해 Trunk 최대 근파워와 평균 근파워, 최대 스피드와 평균 스피드가 통계적으로 유의하게 향상된 것으로 나타났다. 둘째, STC 운동에 따른 유도 운동수행능력 변인의 변화를 분석한 결과, OEG가 DEG와 NEG에 비해 유도 운동수행능력의 메치기에서 통계적으로 유의하게 향상된 것으로 나타났다. 결론적으로 STC 운동이 대학유도선수의 Trunk 근파워와 스피드 및 유도 운동수행능력에 긍정적인 영향을 미치는 것으로 나타났다.

크레아틴과 탄수화물 복합 투여가 무용수행력 및 생리적 변인에 미치는 영향

이지현 ( Ji Hyun Lee ),백일영 ( Il Young Paik ),김지수 ( Ji Soo Kim ) 연세대학교 체육연구소 2014 체육연구논문집 Vol.21 No.1

본 연구의 목적은 여성 현대무용수를 대상으로 크레아틴과 탄수화물을 각각 구강 투여하여 무용수행력의 변화뿐만 아니라 암모니아, 무기인산염과 같은 혈중 생리적 피로물질의 변화와 코티졸, 에피네프린과 노르에피네프린과 같은 스트레스성 호르몬, CK와 LDH 같은 근 손상지표물질의 변화 정도를 살펴봄으로써, 크레아틴과 탄수화물의 효과를 과학적으로 적용하는데 목적이 있다. 본 연구의 대상은 의학적으로 특별한 질환이 없는 30세 이하의 여성 현대무용수 15명을 대상으로 크레아틴 투여 그룹 5명, 탄수화물 투여 그룹 5명, 크레아틴과 탄수화물 투여 그룹 5명으로 구분하였으며, creatine supplementation group은 IRONTEK 社의 creatine monohydrate(Korea)을 8일간 아침, 점심, 저녁, 취침 전(20g/day) 경구 투여하였고, carbohydrate supplementation group(n=5)은 NOW 社의 carbogain(USA)을 8일간 아침, 점심, 저녁(120g/day) 경구 투여하였으며 combine supplementation group(n=5)은 8일간 아침, 점심, 저녁 IRONTEK社의 creatine supplementation(Korea)20g/day와 NOW 社의 carbogain(USA) 120g/day를 경구 투여하였다. 무용수행력 테스트는 3분 길이의 작품을 5회 반복하여 회당 심박수(Heart Rate; HR)와 운동자각도(Ratings of Perceived Exertion; RPE)를 측정을 하였다. 본 연구의 보다 과학저인 효과를 입증하기 위하여 8일간의 크레아틴, 탄수화물, 크레아틴과 탄수화물 복합 경구 투여 전·후에 모든 피험자들을 대상으로 사전·사후 검사를 실시하였고, 사전·사후의 검사는 기본검사(체성분)를 포함하며, 안정 시, 체력요소와 무용수행력 테스트 직후(운동직후), 회복 30분 후에 모든 피험자들의 혈액 채취를 통해 이루어졌다. 본 연구를 통하여 얻은 결론은 다음과 같다. 크레아틴, 탄수화물, 크레아틴과 탄수화물복합 경구 투여한 사전·사후 결과 세 그룹 모두 body weight(kg), skeletal muscle mass(kg), body fat(%)가 유의하게 증가되었고, 무용수행력을 평가하는 테스트에서는 사전·사후 결과 세 그룹 모두 심박수(HR)와 운동자각도(RPE)가 감소하는 경향을 보였으며, 채혈시기에 따른 대사적 피로요인 암모니아와 무기인산염은 운동직후 증가하였다가 회복30분에는 감소하는 경향을 보였다. 하지만 사후 검사의 세 집단 간 차이에서는 암모니아는 안정 시, 운동직후, 회복 시 유의한 차이가 없었고, 무기인산염은 안정 시, 운동직후에 통계적 유의한 차이가 나타났다. 스트레스성 호르몬 변화 결과 중 코티졸, 에피네프린, 노르에피네프린은 운동직후 증가하였다가 회복 30분에는 감소하는 경향을 보였지만 사후 검사의 세 집단 간 차이에서는 코티졸과 노르에피네프린은 회복 시에만 통계적 유의한 차이가 나타났으며, 에피네프린은 통계적 유의한 차이가 나타나지 않았다. 근 손상지표물질인 CK, LDH 역시 운동직후 증가하였다가 회복 30분에는 감소하는 경향을 보였다. 하지만 사후 검사의 세 집단 간 차이에서는 CK 경우 안정 시, 운동직후, 회복 30분 모두 통계적 유의한 차이가 나타나지 않았고, LDH의 경우 안정 시, 운동직후에 통계적 유의한 차이가 나타났다. 이상 다음의 연구결과들을 종합하며 볼 때, 단 기간의 크레아틴, 탄수화물, 크레아틴과 탄수화물 복합 경구 투여는 무용수들의 무용수행력에 유용하며, 대사적 피로요인 및 스트레스성 호르몬, 근 손상지표물질 요인의 감소에 대해 긍정적인 효과를 볼 수 있다고 판단된다. 그러나 체력과 수행력만큼 중요하게 여겨지는 체중과 체지방 증가가 나타나는 것으로 보아 공연 전 체중 감량을 해야 하는 무용수들은 크레아틴과 탄수화물의 추가 투여로 인한 체중 증가를 고려해야 할 것으로 판단된다. The study has its purpose to scientifically apply an effect of creatine and carbohydrate by examining dance performance change after administering creatine and carbohydrate to female modern dancers, and degree of change of physiological fatigue including inorganic phosphate, hormone induced by stress including cortisol and epinephrine, norepinephrine, and muscle injury marker including CK and LDH. The study has based on 15 female dancers under 30 years old without notable disease and participants were classified by 3 groups, creatine supplementation group(n=5), carbohydrate supplementation group (n=5), and combine supplementation group(n=5).During 8 dayperiod, the members of creatine supplement group have orally administered IRONTEK``s creatine monohydrate(Korea) for 4 times a day: morning, noon, evening, and before bed(20g/day). In 8 days, the members of carbohydrate supplement group(n=5) have orally administered NOW``s carbogain(USA) for 3 times a day: morning, noon, and evening(120g/day), and for the members of combine supplementation group(n=5), both 20g of IRONTEK``s creatine supplementation and 120g of NOW``s carbogain(USA) was orally administered 3 times a day: morning, noon, and evening. For dance performance test, 3 minutes length combination was repeated for 5 times to measure heart rate and ratings of perceived exertion.In order to get reliable scientific effect, all of participants have gone through preliminary and post inspection before and after 8 days of oral administration of creatine, carbohydrate, and combine. The preliminary and post inspection was included basic inspection(body composition), and blood for participants were collected right after dance performance test, and after 30 minutes of recovery.The conclusion of study are as follows. As a result of before and after creatine, carbohydrate, and combine oral administration, body weight(kg), skeletal muscle mass(kg), body fat(%)was significantly increased in all of 3 groups. In addition, for physical element examination, as a result of before and after creatine, carbohydrate, and combine oral administration, all 3 groups have increased their muscular strength, endurance, and quickness, however, there were no statistic difference between 3 groups. For dance performance examination, as a result of before and after creatine, carbohydrate, and combine oral administration, the combination``s heart rate and RPE has reduced in 3 groups. After each administered group``s dance performance, ammonia and phosphorus has increased and has decreased after 30 minute recovery based on drawing blood period among cause of change in metabolic fatigue. However, for difference of 3 groups after examination, there was no significant difference shown for ammonia during rest, recovery and right after exercise and there was difference shown for phosphorus during rest and right after exercise. Among hormonal change due to stress, based on each group``s blood collection period, cortisol, epinephrine, norepinephrine has increased right after exercise and tends to decrease after 30 minute of recovery. For difference of 3 groups after examination, there was significant difference shown for cortisol, however, during rest, recovery and right after exercise, there was no difference shown for epinephrine. The significant statistical difference was only shown in norepinephrine during a recovery. After dance performance, among changing result of muscle injury markers based on blood gathering time, CK and LDH was increased right after exercise, but was reduced after 30 minutes of recovery. For difference of 3 groups, however, during rest, after exercise, and 30 minutes after recovery, no statistical difference was shown in case of CK, and LDH has shown statistical difference only during rest and right after exercise. As far as following result summary is concerned, the administration of creatine, carbohydrate, combine for short period has influenced on physical element and dance performance and it has shown positive effects on decrease of metabolic fatigue factor, hormone induced by stress, muscle injury markers. Therefore, the difference on additional supply of creatine, carbohydrate, combine for 3 groups was not shown, however, each administration has shown to put positive influences on decrease of fatigue factors, stress hormone, and muscle injury markers. The increase of weight due to additional supply of creatine and carbohydrate should be considered by dancers who have to consider weightloss, because weight and body fat which is critical factor as much as physical stamina and performance has shown to be increased. Although creatine and carbohydrate has shown a positive effect in this study, it cannot be concluded, because of deficiency of preresearch and adminstration studies based on dancers. Therefore, in the post research, systemic research with long term dance program and various intensities of dance, adminstration time and period for creatine and carbohydrate, is requested under strict restriction.

탄력밴드 운동프로그램이 대학생의 근력과 운동수행능력에 미치는 영향

이효정 ( Hyojeong Lee ),박수정 ( Sujeong Park ),신희문 ( Heemun Shin ),이다운 ( Daun Lee ),이정아 ( Jungah Lee ),정의경 ( Uigyeong Jeong ) 대한통합의학회 2016 대한통합의학회지 Vol.4 No.2

Purpose : The purpose of this study was to evaluate the effectiveness and analyse the change on muscular strength and exercise performance ability of university students participating in leisure sports by elastic-band exercise program. Method : The subjects(N=22) participating in leisure sports are recruited from K university located in Chungbuk. The subjects which are divided to 2 groups as experimental group(N=11) conducted elastic-band exercise program and control group(N=11) conducted stretching program. The muscular strength and exercise performance ability were measured before and after intervention. Result : There were no significant differences(p>.05) in sex, age, height, and weight among subjects. In the measurement of muscular strength, a significant difference(p<.05) was observed in each group, and there was also significant difference(p<.05) between two groups except gastrocnemius(p>.05). A significant difference(p<.05) in muscular volume was observed in each group, and there was also significant difference(p<.05) between two groups apart from gastrocnemius(p>.05). In exercise performance ability, there was significant difference(p<.05) in sergent jump and side-step in each group, and there was a significant difference(p<.05) between two groups in sergent jump, but there was no significant difference(p>0.5) in side-step. Conclusion : Based on this study, through a variety of age and various intervention period to apply more subjects conducting elastic-band exercise program should continue.

12주간 크로스핏 파워 트레이닝이 20대 남성의 운동수행력 및 근기능에 미치는 영향

안홍준,김대열 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.5

The purpose of this study was to examine the effects of Crossfit power training on physical performance and muscular function in college-aged males. Total participants (N=18) were randomly divided into Crossfit power training group (n=9, CPT) and non-exercise control group (n=9, CON). During the training period, participants in the CPT performed Crossfit power training (3 times/week & 60 min/session), and participants in the CON group maintained their normal physical activity. After baseline tests (independent t-test), two-way repeated-measures analysis of variance (ANOVA) with contrast testing was used (alpha(.05)). According to the results, grip strength, abdominal strength, back squat, shoulder press, dead lift, sit-up, push-up, and sit & reach in the CPT were significantly improved, but except for back squat & deadlift, others were not significantly improved in the CON. In addition, grip strength, abdominal strength, back squat, shoulder press, and sit & reach in the CPT at POST were significantly higher than in the CON. Standing jump, whole body reaction time, anaerobic peak power, anaerobic mean power, and isokinetic knee extension & flexion in CPT were significantly increased, but not in CON. Moreover, standing jump, whole body reaction time, anaerobic peak power, anaerobic mean power, and isokinetic knee extension & flexion in the CPT at POST were significantly greater than the CON. Thus, the results show that Crossfit power training for 12 weeks positively enhances the physical performance and muscular function in young males. 본 연구는 12주간 크로스핏 파워 트레이닝이 20대 남성의 운동수행력 및 근기능에 어떠한 영향을 미치는가를 연구하였다. 20대 남성 18명을 모집한 후 운동그룹(CPT, Crossfit Power Training group) 9명과 통제그룹(CON, Control group) 9명으로 무선할당 배정하였다. 연구기간 동안 CPT 그룹은 크로스핏 파워 트레이닝(12주간 주 3회 60분씩)을 실시하였고, CON 그룹은 평소와 동일한 생활하였다. 자료처리는 모든 변인들의 사전값의 동질성(독립표본 t 검정)을 확보한 후 반복측정분산분석과 대비검증으로 분석하였고, 유의수준은 .05로 설정하였다. 연구결과 운동수행력에서 CPT 그룹의 악력, 배근력, 백스쿼트, 숄더프레스, 데드리프트, 윗몸일으키기, 팔굽혀펴기, 유연성이 유의하게 향상되었지만 CON의 백스쿼트와 데드리프를 제외한 다른 변인은 변화하지 않았다. 추가적으로 CPT의 악력, 배근력, 백스쿼트, 숄더프레스, 유연성의 사후값이 CON의 사후값 보다 유의하게 높게 나타났다. 또한 근기능에서 CPT 그룹의 제자리멀리뛰기, 반응시간, 피크파워, 평균파워, 등속성 신근력과 굴근력이 유의하게 증가하였지만 CON은 변화하지 않았다. 추가적으로 CPT 그룹의 제자리멀리뛰기, 반응시간, 피크파워, 평균파워, 등속성 신근력과 굴근력의 사후값이 CON의 사후값 보다 통계적으로 유의하게 높게 나타났다. 이상의 결과를 종합해보면 12주간의 크로스핏 파워 트레이닝은 20대 남성의 운동수행력과 근기능에 긍정적인 영향을 미친 것으로 볼 수 있다.

인공공압근육 엑츄에이터를 이용한 족관절 보조기의 족저굴곡 토크 평가

김경(Kyung Kim),권대규(Tae-Kyu Kwon),강승록(Seung-Rok Kang),박용군(Yong-Jun Piao),정구영(Gu-Young Jeong) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.6

Ankle-foot orthosis with an artificial pneumatic muscle which is intended for the assistance of plantarfelxion torque was developed. In this study, power pattern of the device in the various pneumatics and the effectiveness of the system were investigated. The pneumatic power was provided by ankle-foot orthosis controlled by user’s physiological signal, that is, muscular stiffness in soleus muscle. This pneumatic power can assist plantarflexion torque of ankle joint. The subjects performed maximal voluntary isokinetic plantarflexion motion on a biodexdynamometer in different pneumatics, and they completed three conditions: 1) without wearing the orthosis, 2) wearing the orthosis with artificial muscles turned off, 3) wearing the orthosis activated under muscular stiffness control. Through these experiments, we confirmed the effectiveness of the orthosis and muscular stiffness control using the analyzing isokinetic plantarflexion torque. The experimental results showed that isokinetic torques of plantarflexion motion of the ankle joints gradually increased in incremental pneumatic. The effectiveness of the orthosis was -7.26% and the effectiveness of the muscular stiffness control was 17.83% in normalized isokinetic plantarflexion torque. Subjects generated the less isokinetic torques of the ankle joints in wearing the orthosis with artificial muscles turned off, but isokinetic torques were appropriately reinforced in condition of wearing the orthosis activated under muscular stiffness control(17.83%) compared to wearing the orthosis(-7.26%). Therefore, we respect that developed powered orthosis is applied in the elderly that has weak muscular power as the rehabilitation equipment.

크레아틴 식이 섭취 제한 후 로딩이 하지 근 파워와 무산소성 수행력에 미치는 효과

안경준,이종삼 한국체육대학교 체육과학연구소 2023 스포츠사이언스 Vol.41 No.1

The purpose of this study was to verify effects of creatine loading following restricted ingestion of dietary creatine on lower muscular power and anaerobic performance in healthy young female. For this study, normal fifteen-female D. university students have participated for six weeks experimental protocol. Subjects were allocated into one of two group either restricted diet control group(RD, n=8) or unre- stricted diet control group(URD, n=7). The study has experimented to change treatment of 3 times(pre experiment, two weeks after ex- periment, three weeks post exercise beginning, post creatine loading), based on each treatment period, lower extremity muscle power and anaerobic performance (sargent jump & short-distance sprint) were measured and analyzed using isokinetic muscle function test equip- ment 4 times. Data obtained from this study were analyzed SPSS 20.0 in statistic program by two-way ANOVA and independent t-test, repeated measure ANOVA, statistical significance was set at α=.05. The results of lower muscular power and anaerobic performances are as follows: First, all factors showed changes according to the treatment period in the maximum power per body weight during the ex- tension and flexion exercise of the lower extremity muscle power using the isokinetic muscle function test equipment. Second, anaerobic performance (sargent jump & short-distance sprint) also showed changes according to the treatment period, but there was no difference in comparison between groups, indicating that dietary control to improve creatine sensitivity did not affect lower extremity muscle power.