• 대한정형도수물리치료학회지
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• 제17권1호
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• pp.29-34
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• 2011

Background: The purpose of this study was to investigate the effect of a Kinesio taping on muscle power and fatigue index in quadriceps femoris (vastus medialis, vastus lateralis, rectus femoris.). Methods: 15 male (heathy collegiate students) was enrolled from Kyungwoon university, Gumi. Kinesio tape was applied on quadriceps femoris muscle of subjects. Muscle power and fatigue index was measured by Wingate ergometer (warm-up was 30sec in 60W, maximum power test was 30sec in 100W, recovery was 30sec in 60W) in pre- and post applied taping. Results: As a results, there showed statistically significant improvement in mean power, peak power, mean power/kg, peak power/kg, fatigue index (p<.05). Conclusions: The study of Wingate test by applying Kinesio taping was significantly effected in mean power, peak power, mean power/kg, peak power/kg.

• International Journal of Industrial Entomology and Biomaterials
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• 제39권1호
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• pp.34-38
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• 2019

In this study, we investigated the effect of silkworm, and its by-products on exercise endurance, muscle mass, and fatigue recovery using ICR mice model. Powders of silkworm, pupae, dongchunghacho, and silk powder were suspended in water and feed to mice for 2 weeks. The forced swimming time was increased by 4.3, 4.1 and 2.8 seconds after silkworm, pupae, and dongchughacho administration compared to DW fed group. Increases in exercise ability were achieved by difference mechanism according to feeding materials. Pupae increased muscle mass by 129% compared with the control group which may effect on elongation of swimming time. Dongchunghacho improved the plasma concentrations of fatigue markers such as creatinine, blood urea nitrogen (BUN), and D-lactate. Silkworm administration showed dual effect, the muscle mass induction (114% vs. control) and anti-fatigue (plasma creatinine, BUN, and D-lactate were 63, 75, and 78% vs. con) effect which contributed most elongated swimming time. In conclusion, silkworm and its by-products including pupae and dongchunghacho with the predominant protein and bioactive components improved muscle mass and showed anti-fatigue effect which could promote exercise performance ability.

• 디지털융복합연구
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• 제11권11호
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• pp.545-551
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• 2013

본 연구는 단시간 들기 내리기 작업을 실시한 누적피로 대상자에게 미세전류자극 및 휴식을 적용하여 피로 지수에 미치는 영향을 비교하였다. 2012년 12월부터 2013년 2월까지 S대학에서 연구가 진행되었으며, 말초질환 및 근골격계 질환이 없고 오른손을 사용하는 20대의 신체 건강한 남자 22명을 대상자로 선정하였다. 모든 대상자는 10 kg 상자를 15분 동안 들기 내리기를 100회 실시한 직후, 표면근전도기를 이용한 근피로지수(Median Frequency : MF)와 혈액피로지수(Creatine Kinase Lactate : CK, Lactate Dehydrogenase : LDH)를 측정하였다. 두 그룹으로 나누어 실험군에는 미세전류자극을 대조군에는 휴식을 각각 20분간 중재하였다. 중재 후, 근피로지수와 혈액피로지수를 측정하여 누적 피로지수의 변화를 비교하였다. 그 결과 휴식그룹의 왼쪽 척주세움근 피로지수를 제외한 두 그룹 모두에서 중재방법 적용 전보다 적용 후 유의한 누적피로의 감소(p<.05)가 있었고, 미세전류의 자극은 휴식과 비교했을 때, 근피로지수의 유의한 감소(p<.05)를 보였지만, 혈액피로지수는 차이가 없었다. 본 연구의 결과를 토대로 미세전류자극은 반복적인 들기와 내리기 작업 종사자들의 근피로회복에 도움이 될 것이라 사료되며, 장시간 피로지수 추적조사 및 중재 적용시간에 따른 피로회복의 상관관계 대한 추가적인 연구가 필요하다.

• 한국정밀공학회지
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• 제22권6호
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• pp.207-212
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• 2005

The purpose of this work is to develop the FES controller that can cope with the muscle fatigue which is one of the most important problems of current FES (Functional Electrical Stimulation). The feasibility of the proposed FES controller was evaluated by simulation. We used a fitness function to describe the effect of muscle fatigue and recovery process. The FES control system was developed based on the biological neuronal system. Specifically, we used PD (Proportional and Derivative) and GC (Gravity Compensation) control, which was described by the neuronal feedback structure. It was possible to control of multiple joints and muscles by using the phase-based PD and GC control method and the static optimization. As a result, the proposed FES control system could maintain the cycling motion in spite of the muscle fatigue. It is expected that the proposed FES controller will play an important role in the rehabilitation of SCI patient.

• 대한물리의학회지
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• 제18권4호
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• pp.121-131
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• 2023

PURPOSE: The purpose of this study was to evaluate the effects of ice and hot packs on proprioception, balance, and muscle strength in knee extensor muscle fatigue. METHODS: A total of 31 male and female students in their twenties from a university in A, Chungnam, Korea, were selected as participants. Three experiments were conducted to assess static balance, dynamic balance, proprioception, and muscle strength before and after induction of muscle fatigue, and following intervention. RESULTS: In the case of stability typical (ST), a significant difference was observed in pillow with eye open (PO) when a Hot pack was applied (p < .05). The weight distribution index (WDI), showed significant differences in normal eye open (NO) and Normal eye closed (NC) tests when ice packs and hot packs were applied (p < .05). In the dynamic balance assessment using Y-balance, significant differences were observed in all values except for pre- and post-intervention in the medial and lateral directions (p < .05). The recovery of proprioceptive sensation showed a significant difference when ice packs were applied (p < .05). In muscle strength, significant differences were observed in all comparisons between measurement time points (p < .05). CONCLUSION: Rest was most effective for static balance, and cold and warm compresses were most effective in recovering dynamic balance. For proprioception, cold compresses were most effective. Muscle strength had a positive effect on recovery in all three intervention methods. These results show that cold and warm compresses can be useful in the recovery of various functions related to muscle fatigue.

• 한국응용과학기술학회지
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• 제37권6호
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• pp.1646-1658
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• 2020

이 연구의 목적은 운동 후 수중회복방법의 차이가 성장호르몬, 테스토스테론, 혈중젖산농도, 심부담도, 통증의 변화를 알아보는 것이다. 저항운동 경력 6개월 이상인 남자 7명을 대상으로 집중 웨이트 트레이닝과 서킷 웨이트트레이닝을 1RM의 60%강도로 실시한 다음 회복방법으로 수중걷기회복과 수중앉기 회복을 진행하였다. 성장호르몬은 모든 운동형태와 회복방법에서 운동 후, 회복 후, 안정 시 순으로 높게 나타났으며, 테스토스테론은 운동 후, 회복 후, 안정 시 순으로 높았다. 혈중젖산농도는 모든 운동형태와 회복방법에서 운동 후, 회복 후, 안정 시 순으로 높았으며 집중저항운동 후 동적회복이 정적회복보다 낮았다. 심부담도는 모든 운동형태와 회복방법에서 운동 후, 회복 후, 안정 시 순으로 높았다. 근통증은 모든 운동형태와 회복방법에서 운동직후, 회복 후, 24시간, 48시간, 72시간 순으로 감소하였다. 물속 환경에서도 동적회복이 정적회복보다 근피로 개선에 효과가 있는 것으로 사료된다.

• 전기학회논문지
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• 제65권4호
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• pp.678-683
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• 2016

The study aim was to investigate a comparison of muscle activity fatigue between maximal and submaximal strength gains during the bench press in men. It was hypothesized that maximal voluntary contraction (%MVC) would similar gains between maximal and submaximal strength gains during the bench press, but median frequency (MDF) would increase in maximal compared with submaximal exercise. Employing a randomized, counterbalanced crossover design, 12 men were asked to perform maximal repetitions and submaximal repetitions (concentric: 1-s, eccentric: 1-s, 2-s/repetition) to failure with a load of 85% of 1RM for the bench press, with a 3-minute recovery between the sets. Each subject was tested for the number of repetitions and sets, total work in bench press. Surface electromyography (EMG) was recorded from the pectoralis major, deltoid anterior, and triceps brachii for %MVC and MDF. Total work was significantly higher in the submaximal repetition exercise than that the maximal repetition exercise (p<.05). Muscle fatigue of pectoralis major, deltoid anterior and triceps brachii were significantly smaller in the submaximnal repetition exercise than that the maximal repetition exercise (p<.05, respectively). However, muscle activity of pectoralis major, deltoid anterior, and triceps brachii were not significantly different between exercises. Our study showed that a smaller muscle fatigue in submaximal repetitions, despite higher in total work and a similar in muscle activity were observed. These results suggest that submaximal repetitions during the bench press would be enhanced intensity and/or volume compared with maximal repetitions exercise.

• Journal of Nutrition and Health
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• 제34권8호
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• pp.872-880
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• 2001

The purpose of this study was to investigate the effects of glucuronic acid on antioxidative defense system and recovery of muscle fatigue in rat artier aerobic exercise. Sprague-Dawley male rats weighing 150 $\pm$ 10g were randomly assigned to one normal(N) group and three exercise training groups. Exercise training groups were classified into glucuronic acid free intubation group(T group), 250mg glucuronic acid/kg bw intubation group(TU group), and 500 mg glucuronic acid/kg bw intubation group(2TU group) according to glucuronic acid supplementation level. The glucuronic acids were administered to rats by oral intubation before exercise training. The experimental rats in exercise training groups(T, TU and 2TU) were exercised on glucuronic acid supplementation or rats in normal group were confined in cage for 4 weeks. And rats were sacrificed with an overdose of pentobarbital injection just after running. Liver xanthine oxidase(XOD) activities were not significantly different among four groups. The activity of superoxide dismutase(SOD) in T group was no significant difference from N group, but those of TU and 2TU groups were increased by 9% and 18%, respectively, compared with that of T group. Liver glutathione peroxidase(GSHpx) activites of T and TU groups showed a similar tendency to that of normal group, but increase 17% in 2TU group compared with normal group. The ratio of GSH/GSSG in liver of T group was lower than that of normal group, but those of TU and 2TU groups were a similar tendency to that of normal group. Contents of thiobarbituric acid reactive substance(TBARS) in T group was increased by 47%, compared with that of normal group but those of TU group and 2TU group were lower 27% and 35%, respectively, compared with that of T group. The contents of glycogen in soleus muscle significantly lower in all three trained exercise groups than that of normal group, but there were no significant differences among the trained exercise groups. Contents of hepatic glycogen in T group were decreased 27% compared with those of normal group while those of TU and 2TU groups were the same as normal group levels. The contents of serum lactic acid in T group were increased 240% of normal group, but hose of TU and 2TU groups were decreased 38%, 39%, respectively, by glucuronic acid supplementations, compared with that of T group. In conclusion, the effects of glucuronic acids in exercise training rats would appear to reduce peroxidation of tissue as an antioxidative defense mechanism and promote recovery of muscle fatigue.

• 운동영양학회지
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• 제24권2호
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• pp.38-46
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• 2020

[Purpose] This study aimed to investigate the effects of leucine-enriched essential amino acid (LEAA) supplementation on muscle fatigue and the level of inflammatory cytokines in wheelchair basketball players after a basketball game and interval training. [Methods] Of the ten recruited wheelchair basketball players (aged 34.5±8.9 years; lean body mass of 34.3±10.0 kg) who had spinal cord injury (SCI) and had undergone amputation, nine participated in the final test. These nine athletes received LEAA supplements (3 times 4.0 g/day) or placebo treatment in a double-blind, randomized, crossover study. We measured variables related to muscular fatigue and inflammatory response before the intense exercise and 4 days after recovery. [Results] The significant effect of LEAA supplementation was inhibition of circulating IL-6 levels in the LEAA-treated group compared with the placebo group (P < .05). However, no changes were observed in the TNF-α and creatinine kinase levels. Moreover, analysis of variance analysis showed no significant difference in the relative values of muscle soreness. However, the effect size analysis with Cohen's d reported a significant improvement in the relative values of whole body and back muscle soreness. [Conclusion] Our results revealed that LEAA supplementation before and after intense exercise could help reduce muscle soreness and IL-6 levels in wheelchair basketball players.

• 한방재활의학과학회지
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• 제20권1호
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• pp.119-132
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• 2010

Objectives : The purpose of this study is to compare interrelations between stress and muscles of neck through stress response inventory(SRI), 7 zone diagnostic system and surface electromyography(sEMG). Methods : This study was carried out with the data from SRI, 7 zone diagnostic system and sEMG. First subjects were divided into two group according to the SRI points. subjects in group A had points of SRI in which lower than 30 points. Subjects in group B had points of SRI in which higher than 30 points. And subjects were divided into nonstress group(Group C) and stress grouop(Group D) according to the result of 7 zone diagnostic system. Then we investigated how to differentiate the muscle contraction, fatigue, recovery and asymmetry ratio on sEMG for each groups. Results : In this study, the muscle contraction of both upper trapezius muscle and left sternocleidomastoid muscle and left scalene muscle in stress group were higher than nonstress group significantly. And the muscle recovery of left sternocleidomastoid muscle and left scalene muscle in stress group were higher than nonstress group significantly. Conclusions : This results show that the stress was associated with muscle condition.