Tensiomyography를 이용한 중추 피로에 의한 근육 손상의 평가

채정훈 ( Jung Hoon Chai ),배상원 ( Sang-won Bae ) 대한스포츠의학회 2020 대한스포츠의학회지 Vol.38 No.4

This study compared muscle function pre- and post-central fatigue caused by a marathon, using maximal displacement (Dm), which indicates muscular stiffness in tensiomyography (TMG) results. Blood and noninvasive TMG test were performed on the 1st, 3rd, and 5th days before and immediately after the marathon. The muscles assessed were the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), semitendinosus (ST), tibialis anterior, gastrocnemius lateralis, and gastrocnemius medialis. Lactate dehydrogenase levels (lactate dehydrogenase) increased sharply immediately after the competition and decreased to the pre-competition level after 5 days. Dm was the highest immediately post-competition at BF, ST, VL, VM, and RF muscles, with a tendency to decrease to pre-competition levels after 1 day. The application of TMG to identify muscle changes in central fatigue studies may be appropriate in the proximal region rather than in the distal region.

Tensiomyography를 이용한 보디빌더 근육의 특성 분석

채정훈 ( Jung Hoon Chai ),김보경 ( Bo Kyeong Kim ),김찬 ( Chan Kim ),김철현 ( Chul Hyun Kim ),배상원 ( Sang Won Bae ) 대한스포츠의학회 2016 대한스포츠의학회지 Vol.34 No.2

The aim of this study is to evaluate the contractile properties of thigh muscles in bodybuilders through tensiomyography (TMG). Our hypothesis is that maximal displacement (Dm) in bodybuilders would be lower than in controls because Dm is increased when the muscle is stiffed or hypertrophied. Nine bodybuilder athletes and 15 university students were assessed by TMG. The biceps femoris (BF), semitendinosus (ST), vastus lateralis, vastus medialis (VM), and rectus femoris (RF) were evaluated. The TMG parameters obtained for each muscle were Dm, contraction time (Tc). And we calculated contraction velocity (Vc) as the rate of the radial displacement occurring during the time period of Tc with respect to Tc. Dm values of all muscles in bodybuilders were significantly higher compared to the control group. There were no significant differences in Tc values of most muscles except right BF and ST muscles. Vc values of VM, RF, and ST muscles were lower in bodybuilders than in the control group. This is the first report about TMG assessment of muscle hypertrophy. We found that Dm was most effective in detecting muscle hypertrophy and muscle stiffness secondary to muscle hypertrophy could induce decrease in Dm and Vc.

Tensiomyography 측정 방법의 신뢰도 평가

채정훈 ( Jung-hoon Chai ),김보경 ( Bo-kyeong Kim ),최혁재 ( Hyuk-jae Choi ),배상원 ( Sang-won Bae ) 대한스포츠의학회 2018 대한스포츠의학회지 Vol.36 No.3

Purpose: This study is designed to evaluate the reliability for studies of tensiomyography (TMG). TMG can evaluate muscle function noninvasively and selectively. Methods: We measured 12 male volunteers (age, 26.5±7.6 years; height, 175.3±4.7 cm; weight, 78.8±13.3 kg) in this study and measured TMG during three occasions over 3 consecutive days. None of the participants has had any history of neuromuscular disorders or muscle diseases. Vastus lateralis, vastus medialis (VM), rectus femoris (RF) in quadriceps and biceps femoris, semitendinosus in hamstrings muscles were measured. Coefficient of variation (CV%) and intraclass correlation coefficient (ICC) have been calculated about maximal displacement (Dm, mm) and contraction time (Tc, ms) which are main parameters. Results: Most of the ICC of Dm were over 0.8 and the highest among the muscles except both VM. And, most ICC of Tc was lower than Dm except both BF (right, 18.31; left, 15.03). But, the ICC of Tc was lower than Dm except left RF (0.890) and VM (0.859). Conclusion: This study has shown that the Dm is high levels of the ICC and CV(%) in thigh muscle except VM. In the future, we plan to establish the method of measurement more clearly for reducing the errors of measurements. The technique of correct palpation of measurable muscles using TMG devices is also necessary.

우수 청소년 배드민턴선수에서 Tensiomyography를 이용한 경기 전·후 하지 근육의 특성

김학균 ( Hak-kyun Kim ),채정훈 ( Jung Hoon Chai ),김철현 ( Chul-hyun Kim ) 한국체육학회 2021 한국체육학회지 Vol.60 No.4

이 연구의 목적은 여자 국가대표 청소년 배드민턴선수에서 경기 전과 경기 직후에 하지근육의 수축 특성을 근장력계(TMG: Tensiomyography)로 분석하여 과도한 사용과 피로에 약한 근육을 구별하고자 목적하였다. 배드민턴 경기 전과 직후 넙다리네갈래근과 넙다리뒤근육의 최대이동변위와 수축 시간 및 속도를 TMG로 평가하였다. 연구결과, 최대이동변위(Dm)는 모든 개별 골격근에서 유의한 변화는 없었으나, 우세측 반힘줄모양근의 최대이동변위가 경기 직후에 증가하는 경향을 나타냈다(p=0.086). 경기 직후에 수축시간(Tc)의 변화는 우세측 안쪽넓은근과 비우세측 가쪽넓은근이 유의하게 감소하였고 (p<.05), 수축속도(Vc)는 우세측 안쪽넓은근이 유의하게 빠른 수축속도를 보였다(p<0.05). 결론적으로 시합 후에 반힘줄모양근은 피로에 의해 근장력이 약화되고 우세측 안쪽넓은근과 비우세측 가쪽넓은근이 과도하게 근육이 긴장하는 특성을 보였다. 이 결과, 청소년 배드민턴선수에서 부상을 예방하기 위해서 시합직후에 반힘줄모양근의 회복을 촉진하고 과긴장된 안쪽넓은근과 가쪽넓은근을 이완하는 중재가 필요하였다. The purpose of this study was aimed to distinguish between excessive use and fatigue-sensitive muscles by analyzing the contraction characteristics of the lower limb muscles with tensiomyography (TMG) before and after the competition in female youth national badminton players. Before and immediately after the badminton game, the maximum displacement, contraction time and contraction velocity of the quadriceps and hamstring muscles were evaluated by TMG. As a result of the study, the maximum displacement (Dm) was not significantly changed in all individual skeletal muscles, but the maximum displacement of the dominant semitendinosus muscle showed an increase level close to the critical value immediately after the competition (p=0.086). Immediately after the game, the change in contraction time (Tc) significantly decreased in the dominant vastus medialis and non-dominant vastus lateralis muscles (p<.05), and the contraction velocity (Vc) was significantly faster in the dominant medial lateral muscle (p<0.05). In conclusion, the muscle tension of the semitendosus muscle was weakened by fatigue, and the dominant medial and non-dominant vastus muscles were excessively tense. Therefore, in order to prevent injuries of female adolescent badminton players, interventions were needed to promote the recovery of the dominant semitendinosus muscles and to relax the hypertensive tension of dominant Vastus Medialis and non-dominant Vastus Lateralis muscles immediately after the game.

Tensiomyography를 이용한 근육손상의 평가 및 적용

배상원 ( Sang Won Bae ),채정훈 ( Jung Hoon Chai ),김보경 ( Bo Kyeong Kim ),김철현 ( Chul Hyun Kim ),김찬 ( Chan Kim ) 대한스포츠의학회 2015 대한스포츠의학회지 Vol.33 No.2

Tensiomyography (TMG) is known as non-invasive method which assesses the muscular characteristics such as contraction velocity or maximal displacement of the belly. The aim of this study was to evaluate muscular responses by TMG after muscle injury and to introduce using TMG first in Korea. This study was performed with a subject who was diagnosed with muscular injury and consent measuring and following up TMG analyses. A female patient, who was diagnosed left hip adductor muscle strain, underwent magnetic resonance imaging (MRI) and TMG at intervals of two weeks. We obtained decreased in displace maximum (Dm, 4.14 vs. 5.69) and altered curve shape in the injured muscle at the initial TMG assessment in comparison to the non-injured side. After two weeks, MRI findings and symptom were improved and Dm in the injured side increased as in the non-injured muscle. These findings suggest that a decrease in Dm indicate increased in muscle stiffness after muscle injury, and an increase in Dm as in the non-injured side after two weeks indicate recovered status. TMG may be useful as a simple and non-invasive device for monitoring muscle function after muscle injury and during the recovery.

Tensiomyography: 근육손상의 새로운 평가 방법

김찬 ( Chan Kim ),채정훈 ( Jung Hoon Chai ),김보경 ( Bo Kyeong Kim ),김철현 ( Chul Hyun Kim ),배상원 ( Sang Won Bae ) 대한스포츠의학회 2015 대한스포츠의학회지 Vol.33 No.2

Muscle injuries are very common in sports fields so diagnosis and prevention of them are as important as treatment in sports medicine. Many other devices for muscle diagnostics are provided, but non-invasiveness, cost, validity and reliability become a good measure of diagnosing and monitoring athletes. Tensiomyography (TMG) has beendeveloped in the late 1980s to evaluate deficient muscle initially, and it was introduced into sports medicine and athletic training. It is a simple to use selective and non-invasive for measuring a skeletal muscle response. The method is based on the measurement of the radial displacement of muscle belly, which is caused by an electrical stimulator. The displacement is measured with an electric sensor which is connected to a computer system. It gives the information of maximal displacement of the belly (Dm) with following time parameters: delay time, contraction time (Tc), sustain time, and relaxation time. TMG studies usually focus on two common parameters: Tc and Dm. An increase in Tc indicates a muscle with a predominance of slow-twitch fibers. A decrease in Dm indicates an increase in muscle stiffness or tone. Other studies have been mainly associated with physiological characteristics of muscles, risk factors for muscle or ligament injuries, muscle fatigue, and muscle diseases such as multiple sclerosis. We think the application of TMG to the sports field can reduce the risk of sports injuries and increase performance of athletes. In medical field, it allows functional diagnosis of muscle strain, monitoring rehabilitation, and modifying treatment strategy effectively.

장시간의 일회성 지구성 운동 수행 시 노화에 의한 쥐 골격근의 NF-ĸB 신호전달 변화

김형준(Kim Hyung-Jun),권형태(Kwon Hyeong-Tae),손희정(Son Hee-jung),채정훈(Chai Jung-Hoon),어수주(Eo Su-Ju),김창근(Kim Chang-Keun),김효정(Kim Hyo-Jung) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.3

Nuclear factor kappa B (NF- kB) is an important transcription factor of skeletal muscle atrophy. Several studies have been explored the possibile pathways which may be modulated with exercise and age. The purpose of this study was to examine the effect of one single bout of endurance exercise on nuclear factor kappa B (NF-kB) activation and MuRF1 expression in old rat. 32 rats were used and were divided into two groups by age; 20 weeks (n=16) vs 72 weeks (n=16). Each experimental group was further divided into two subgroups; Before exercise (n=8) and after exercise (n=8). All animals in exercise groups performed a 3 hr swimming exercise (30min x 6 bouts with 5min rest). Following the swimming exercise, the protein level of NF-kB (p65) subunit was increased in both old and young group(p<.05). The protein level of NF-kB (p65) was higher in old than young group before exercise (p<.05) and the expression of MuRF1 in only old group was increased with the swimming exercise(p<.05). On the other hand, In this study phospho-IkBa was unchnaged (p>.05). These results suggest that the expression of nuclear factor kappa B (NF- kB) with endurance exercise may a key role in muscle atrophy in aged group.

고강도의 지구성 운동 수행에 의한 근비대 신호 단백질 mTOR, p70S6K, 4E-BP1 및 AMPK의 발현 변화

한광호(Han Gwang-Ho),권형태(Kwon Hyeong-Tae),손희정(Son Hee-Jeong),채정훈(Chai Jung-Hoon),선주상(Shan Zhou-Xiang),김효정(Kim Hyo-Jeong),김창근(Kim Chang-Keun) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.3

The present study was performed to investigate the effect of endurance running on muscle protein synthesis. Male Sprague-Dawley rats(n = 49) were randomly assigned to the time course of the treadmill running (VO₂max 75-80%, 1hr). Muscle samples were obtained before and recovery period of the exercise (immediately, 30 min, 1hr, 2hr, 3hr and 6hr from the running) at the soleus muscle for the determination of mammalian target of rapamycin (mTOR), p70S6 kinase (p70S6k), eukaryotic initiation factor (eIF) 4E-binding protein (4E-BP1) and AMPK phosphorylation. Endurance exercise generated a significant increase in mTOR phosphorylation immediately after exercise and the phosphorylation maintained up to 6hr of recovery (∼90%, p=.024). In addition, 4EBP1 phosphorylation was significantly increased at the immediately after exercise and decreased up to an hour recovery. However, 4EBP1 was resumed to increase for 2-3hrs during recovery (∼48%, p=.05). However, Phosphorylation of p70S6K was elevated above rest level throughout the 6hrs recovery and reached peak at 6hr recovery (303%, p=.001). On the other hand, Phospho-AMPK (Thr172) was increased from 30min to 3hr of recovery (p<.05). These results clearly demonstrate that intensitive endurance running result in significant differences in protein signaling of muscle protein synthesis.