• Journal of fish pathology
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• v.34 no.1
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• pp.63-70
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• 2021

As a part of research to elucidate the pathogenesis of so called Soft Tunic Syndrome(STS), that caused mass mortalities in the cultured sea squirts, Halocynthia roretzi, the epidemiological and pathological analysis were done to both clinically normal and diseased groups of the farms of Tongyoung and Geoje coastal areas in southeast sea from February to July, 2008. In the histological finding of the tunic, most of individuals showed tunic softness syndromes that included the disarrangement and destruction of tunic fiber with the simultaneous presence of flagellates-like cells, recently suspected as main agents of tunic softness syndromes. Simultaneously, the intensive degenerative changes of the skeletal muscle of diseased sea squirts were recognized. The changes were characterized with the hyalinization and condensation of muscle fibril and hemocytic infiltration in the muscle fibers. Those were thought to be a kind of typical Zenker's necrosis as in the skeletal muscle of higher vertebrates. Besides of the diseased sea squirts, Zenker's necrosis of skeletal muscles were seen in the normal ones. Epidemiological inquiry for diseased groups revealed that the higher incidences of tunic softness syndrome were recorded in the fast growing groups and in the sites presuming the organic pollution. And Higher malondialadehyde(MDA) and glutathione peroxidase(GPx) activity were detected in the groups showing STS. Those results suggested that Zenker's necrosis of body muscles was a kind of"nutritional myopathy" by oxidative stress. Conclusively, it was considered that Zenker's necrosis of body muscles gives an important clue for elucidating pathogenesis of STS of cultured squirts. And it seems that the necrosis were caused by the oxidative stress to body muscle during abnormal rapid growth of sea squirts.

• Journal of the Korean Academy of Clinical Electrophysiology
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• v.2 no.2
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• pp.25-37
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• 2004

To provide reflection diagnostical basic-data by ultrasonography intended for 38 male/female students used by ultrasound imaging system and dynamometer, compared the MVIC and muscle thickness take an accurate measurement of elbow flexor and knee extensor of thickness and MVIC, in confirmity with distinction of sex and then analysised of correlation in muscle thickness-MVIC, MVIC-weight, weight-muscle thickness, it shows statiscally significant difference MVIC and muscle thickness according to sex. Also there is a high interrelation between two. As well as it shows that there is a different between sex in the MVIC of same thickness and MVIC of same weight. This difference will be related with preportions of muscle fiber type in view of the results by preceded research, it needs to be prerequisite analysis of difference in sex with a great variety of ways hereafter.

• The Journal of Korean Physical Therapy
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• v.15 no.3
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• pp.16-44
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• 2003

Skeletal muscle regeneration is a vital process for various muscle myopathies and muscular adaptation to physiological overload. Angiogenesis is the key event in the process of muscle regeneration, and vascular endothelial growth factor(VEGF) plays an important role in it. The purpose of this study was to evaluate the effect of GaAlAs(830nm) laser and immunoreactivity of VEGF on angiogenesis after muscle contusion injury. Muscle contusion injury was induced in the triceps surae muscle by dropping a metal bead(31.4g). GaAlAs laser irradiation(power 20 mW, frequency 2000 Hz, treatment time 15 min) was applied directly to the skin of injured muscle daily for seven days. The experimental group I was irradiated immediately by laser after injury, whereas the experimental group II was irradiated after 1 day of injury. The control group was non-irradiated. The results of this study were as follows. 1. In morphological observation, there were no significant changes in experimental and control groups for 7 days. At 3 days, however, the splited muscle fibers were observed in experimental groups, and the muscle atrophy and granular tissue viewed at 7 days in control group. 2. The VEGF was expressed in muscle fiber that located in the interspace between gastrocnemius and soleus muscles. As the time coursed, the immunoreactivity of VEGF also seemed to be strong in the individual muscle fibers. 3. The experimental group I & II showed higher immunoreactivity of VEGF than control group(p<0.05). Then, the experimental group I showed higher than group II especially(p<0.05). These data suggest GaAlAs semiconduct diode laser irradiation(830nm) enhanced angiogenesis in the skeletal muscle induced contusion injury, and immediate laser irradiation after injury promoted the angiogenesis greatly than after 1 day of injury.

• The Journal of Korean Physical Therapy
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• v.2 no.1
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• pp.47-63
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• 1990

The purpose of this study was to determined the effect of low-frequency electrical stimulation on the denervated gastrocnemius muscles of the albino rats, Sprague-Dawley. Fifteen Sprague-Dawley adult male albino rats were divided into non-treated (normal) group, denervated (control) group, denervated and electrical stimulated (experiments). The gastrocnemius muscles of the right leg were submaximally stimulated with 30 Hz electrical stimulation. After 4-week period, the animals were sacrificed, and muscle were removed, fixed by immersion, and processed for light and electron microscopy. The numbers of Ag-NOR increased significantly (p<0.001), but significant reductions of girth(p<0.01), wet muscle weight (p<0.001), high glycogen content fiber (p<0.01), and mitochondrial number (p<0.05) were found in denervated control group. In comparison with control group, significant increase of right leg girth (p<0.05), wet muscle weight (p<0.001), high glycogen content fiber (p<0.05), numbers of Ag-NOR(p<0.001), number of mitochondria (p<0.01), mitochondrial volume found in electrical stimulated experimental group. The results suggest that the electrical stimulation of the muscle partially prevented the denervated atrophy in the rat gastrocnemius muscles.

• The Journal of Korean Physical Therapy
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• v.14 no.2
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• pp.145-152
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• 2002

This study was carried out of to determine effects of high voltage pulsed galvanic stimulation on the soleus. target muscle of the sciatic nerve, of white rat two condition. The coditions included normal, and denervated muscle. The histochemical, ultrastructural observations were made. The following results were obtains. 1. The histochemical observations found the inflammatory cells between muscle bundle and muscle fiber since 1-week control group. In addition, nucleus located in the muscle fiber was frequently observed. 2. The experimental group showed a similar phenomenom to the normal muscles in terms of glycogen granules in the 1-week group, where as fiber were not distinguishable in4-weeks group which indicated that the degenerative changes had occured. 3. The NADH-TR reaction showed that the red muscle slightly increased in the 2-weeks group, and the distinguished was impossible the red fiber 4. The ultrastructures of the muscles in both groups were severely bend, and a number of vacuoles were observed due to the destruction of mitochondria..

• Maxillofacial Plastic and Reconstructive Surgery
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• v.18 no.3
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• pp.488-499
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• 1996

Diabetes mellitus revealed a chronic disorder of lipid, carbohydrate and protein metabolism characterized by insulin deficiency, and a striking tendency toward development of atherosclerosis, microangiopathy, nephropathy, neuropathy and recently cardiomyopathy etc. The mechanism of heart failure in patients with diabetic cardiomyopathy is not clear but diabetic cardiomyopathy usually occurs in persons with long standing diabetes. After diabetes induced in made Sprague- Dawley strain rats by injection of streptozotocin(60mg/kg), cardiac tissue with hematoxylin-eosin and Masson's trichrome stain was examined at 3 days, 1, 2, 4, 6 weeks later under light microscope. The results were obtained as follows : 1. In H&E stain of control group, myocardiac cells were shorter than skeletal muscle cell, which was branched out and connected each other at terminal with striation, intercalated disk and nucleus at center of cell. 2. In MT stain of control group, a few of collagen fibrile were seen at periva scular interstium, but wasn't seen between skeletal muscle fiber, and cardiac muscle was seen in various size. 3. In MT stain of experimental group, increased collagen fiber deposition at perivascular interstiums were seen periodically. 4. In MT stain of experimental group, increased collagen fiber deposition at interstitial matrix between perimyocardiac cells were seen at 3 day, 4 weeks and 6 weeks after DM induction. 5. In H&E stain of experimental group, partial degeneration of myocardiac cells was seen after 4 weeks of DM induction. From above results, streptozotocin induced diabetes mellitus increased collagen around perivascular and between intercellular matrix in heart.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.1
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• pp.367-376
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• 2014

The purpose of this study was to investigate the effect of either endurance training only or endurance and weight training on muscle morphology and oxidative enzyme activities in human skeletal muscles. Fourteen healthy males were randomly divided into one of two experimental training groups, either swim exercise training (n=7, ST) or combined exercise training (swim and resistance exercise training; n=7, SWT). The change of muscle fiber type was not significantly different between ST and SWT following 6 weeks of exercise training. Mean cross sectional areas as well as the numbers of capillary of different types of muscle fiber were not also significantly different from baseline for both exercise training groups (p>.05) although the tendency of increase were more notable in SWT. All oxidative enzyme activities (i.e., ${\beta}$-hydroxyl acyl dehydrogenase, citrate synthase, and carnitine palmitoyl transferase) were marginally higher in SWT compared to ST even though statistical power did not reach the level of significance. Based on these results, it was concluded that performing of combined (swimming and weight) exercise training could be the better modality for improving muscle morphological changes and oxidative enzyme activities than performing of only single aerobic exercise intervention in young healthy human skeletal muscles.

• Journal of Animal Science and Technology
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• v.64 no.1
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• pp.52-69
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• 2022

Ferulic acid (FA) is a phytochemical with various bioactive properties. It has recently been proposed that due to its phytogenic action it can be used as an alternative growth promoter additive to synthetic compounds. The objective of the present study was to evaluate the growth performance, carcass traits, fiber characterization and skeletal muscle gene expression on hair-lambs supplemented with two doses of FA. Thirty-two male lambs (n = 8 per treatment) were individually housed during a 32 d feeding trial to evaluate the effect of FA (300 and 600 mg d^-1) or zilpaterol hydrochloride (ZH; 6 mg d^-1) on growth performance, and then slaughtered to evaluate the effects on carcass traits, and muscle fibers morphometry from Longissimus thoracis (LT) and mRNA abundance of β₂-adrenergic receptor (β₂-AR), MHC-I, MHC-IIX and IGF-I genes. FA increased final weight and average daily gain with respect to non-supplemented animals (p < 0.05). The ZH supplementation increased LT muscle area, with respect to FA doses and control (p < 0.05). Cross-sectional area (CSA) of oxidative fibers was larger with FA doses and ZH (p < 0.05). Feeding ZH increased mRNA abundance for β₂-AR compared to FA and control (p < 0.05), and expression of MHC-I was affected by FA doses and ZH (p < 0.05). Overall, FA supplementation of male hair lambs enhanced productive variables due to skeletal muscle hypertrophy caused by MHC-I up-regulation. Results suggest that FA has the potential like a growth promoter in lambs.

• The Journal of Korean Physical Therapy
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• v.15 no.4
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• pp.46-64
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• 2003

Therapeutic angiogenesis is the controlled induction or stimulation of new blood vessel formation to reduce unfavourable tissue effects caused by local hypoxia and to enhance tissue repair. Therapeutic ultrasound can be considered as a physical agent to deliver therapeutic angiogenesis. The purpose of this study was to evaluate the effect of therapeutic ultrasound after muscle contusion injury by observed immunoreactivity of vascular endothelial growth factor(VEGF) that plays an important role in angiogenesis and substance-P in pain transmission. Ultrasound irradiation(1MHz, $1W/cm^2$, continuous mode, treatment time 5 min) was applied through water submersion technique to 1 limb daily by kept off 5cm from muscle belly of gastrocnemius. The result of this study were as follows. 1. In morphological observation, there were no significant changes excepts of 7 days. At 7 days, granular tissue viewed abundantly in control group. In other groups, general feature were increased interspace of muscle fiber; centronucleated muscle fiber; collapsed of muscle and nerve tissue; appeared inflammatory cell. 2. The VEGF was expressed in interspace of muscle fiber. Especially, at 7 days in experimental group, VEGF was showed in connective tissue surrounding gastrocnemius muscle. 3. The VEGF was higher expressed in experimental group at 2 and 3 days, but in control group at 7 days. These data suggest therapeutic ultrasound enhanced production of VEGF in the early day relatively, therefore stimulated angiogenesis in the skeletal muscle induced contusion injury. Also therapeutic ultrasound may stimulate pain relief by diminish of substance-P in dorsal horn of spinal cord.

• The Korean Journal of Physiology
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• v.4 no.2
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• pp.19-24
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• 1970

Since the discovery of the muscle spindle by Hassall (1831), an intensive studies of its anatomical and physiological characteristics had been undertaken. Recent morphological studies of Boyd (1962) demonstrated that the muscle spindles have two different intrafusal muscle fibers, nuclear bag and nuclear chain fiber, and these intrafusal fibers are under independent motor innervation by ${\gamma}_1$ and ${\gamma}_2$ motor neurone. Neurophysiological studies of Hunt and Kuffler (1951) showed regulatory effect of ${\gamma}$ motor neurone upon the excitability of the spindle afferents. Harvey and Mathews (1961) observed the dynamic and static characteristics of the two different spindle afferents, the primary and secondary ending. Furthermore, Mathews (1962) postulated the functional existance of two kind of ${\gamma}$ motor neurones, namely, the dynamic and static fusimotor fiber. Recent report of Kim and Partridge(1969) pointed out that the descending vestibular signals had increased the slope of the length-tension relationship in stretch reflex; Kim (1967) demonstrated that the descending vestibular impulses act upon the stretch reflex loop through the ${\gamma}$ motor pathway. These experimental evidences from the morphological and neurophysiological studies on the muscle spindles support the concept that the stretch reflex action of the skeletal muscle operates as a negative feedback control system. The author had discussed the way by which the f system participates in the control of stretch relfex feed back system. that was taken for a prototype of posture and movement.