• The Journal of Korean Physical Therapy
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• v.28 no.3
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• pp.217-220
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• 2016

Purpose: This study was to investigate the differences abdominal muscles activities of according to hip adductor contraction levels 20% (mild), 50% (moderate), and 70% (strong) of MVIC on during bilateral lower extremity raising exercise on supine. Methods: The subjects of the study were a total of 39 persons including 23 healthy males and 16 females, who performed bilateral lower extremity raising exercise in 20%, 50%, 70% MVIC hip contraction. Muscle activities were measured by using S-EMG in RA (rectus abdominis), IO (internal oblique), and EO (external oblique). Results: Muscle activity of the internal oblique abdominal muscle and external oblique abdominal muscle, their activities were also greatest with the adductor contraction size at 70% and there was statistically significant difference when compared with the adductor contraction size at 20% and 50% (p<0.05). As for the rectus abdominis muscle according to the size of contraction of the adductor was greatest at 70%, without statistically significant difference (p>0.05). Conclusion: bilateral lower extremity raising with strong hip joint adductor contraction was effective exercise to strengthen abdominal muscles. If subjects could not perform strong hip adductor contraction, moderate contraction is effective abdominal muscle contraction exercise. The contraction size of the adductor is small, weak contraction may trigger middle level contraction and therefore appropriate application of the exercise program of bilateral leg raising may result in great effect as a lumbar stabilization exercise.

• Journal of Korean Physical Therapy Science
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• v.11 no.4
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• pp.11-19
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• 2004

Muscle stiffness, pain discomfort in daily activities are cardinal symtoms on arthritis. To reduce these symtoms, a nonequivalent one-group pre & posttest experiment was carried out at a rural community health post area in kwangju province during eight weeks(from 25th of January to 20th of March, 2002) The subjects were sixteen old (60-80) with osteoarthritis. And to reduce the level of pain, discomfort in daily living and to increase that of life satisfaction, 25-30minutes of muscle-joint exercise followed by 25-30minutes of local heat therapy were done three times a week. The total experimental period extended at 12 weeks and the total 36 times it executed 1. The retrogression characteristic osteoarthritis elderly with local heat and a muscle joint exercise was the telegram which it receives and after receiving, the score of the paindaily activity function appeared to the lead, there was a difference which considers statistically, this constriction was supported.(Z=4.947, p<0.0001) 2. The retrogression characteristic osteoarthritis elderly with local heat and a muscle joint exercise was the telegram which it receives and after receiving, the score of daily activity function appeared lowly, there was a difference which considers statistically, this construction was supported.(Z=2.7226, p<0.0279) 3. The retrogression characteristic osteoarthritis elderly with local heat and a muscle joint exercise was the telegram which it receives and after receiving, there was not a difference where the quality of life considers statistically, this construction was rejected.(Z=-1.2087, p>0.2171)

• Proceedings of the Korea Society of Poultry Science Conference
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• 2006.11a
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• pp.60-61
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• 2006

Effect of dietary salmonella lysate in broiler chicks inoculated with Salmonella typhimurium on the antioxidant system(freshness) of broiler meats during 4$^{\circ}$C refrigeration was investigated. In Pectoral and leg muscle, regardless experimental diets, as the refrigeration day passed, CuZnSOD activity decreased gradually, while at 7d MnSOD activity and peroxide level raised and then lowered at 14d. MnSOD and peroxidase activity, however, had differed according to experimental diets. The results indicated that antioxidant system of broiler meats will be changed according to experimental diets(nutrients). As the CuZnSOD, MnSOD and peroxidase activity are responsible for proteolysis of muscle protein, it was concluded that change of antioxidant system during 4$^{\circ}$C storage explain the biological activity(freshness) of broiler meats.

• The Journal of Korean Physical Therapy
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• v.19 no.3
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• pp.11-17
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• 2007

Purpose: The purpose of this study were to analyze fatigue patterns of the rectus femoris muscle by isometric contraction. Methods: Twenty healthy subjects(10 male, 10 female) participated in this study. Maximal voluntary isometric contraction(MVIC) was measured by the dynamometer. Muscle activity was recorded from the rectus femoris muscle. During the experiment, the subject was seated in the chair. The measured items, median frequency(MDF) and root mean square (RMS), were collected from the surface EMG. All data were analyzed using repeated measures ANOVA. Results: There was significant difference of MVIC between male and female. Endurance time was significant difference by the level of MVIC but no significant in the main effect(sex) and interaction effect. The MDF and fatigue index were significant differences in the interaction effect. The RMS was not significant difference in both of main and interaction effect. The muscle fatigue patterns of female was greater than male after 60% MVIC. Conclusion: This study showed that sex differences of muscle fatigue were started from 60% MVIC.

• Physical Therapy Rehabilitation Science
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• v.10 no.3
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• pp.263-269
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• 2021

Objective: The purpose of this study was to examine the effects lumbar stabilization exercise with kinesio taping on pain, muscle strength, and oswestry disability index (ODI) in patients with chronic low back pain. Design: Two groups pre-post randomized controlled design Methods: Thirty-two subjects were randomly divided in two groups; 1) lumbar stabilization exercise with kinesio taping group (Experimental group, n=16), 2) lumbar stabilization exercise with sham kinesio taping group (Control group, n=16). The intervention was conducted in each group for thirty minutes a day, 5 times a week, for 4 weeks. Both group did 30 minutes of lumbar stabilization application. Evaluations were performed before the commencement of training and again 4 weeks after training was initiated. Visual analog scale (VAS) was used to evaluate pain level of patients with chronic low back pain. Distal muscle test was used to evaluate muscle strength of trunk extension. In addition, ODI was used to evaluate activity daily life of low back pain. Results: After training, the VAS, muscle strength of trunk extension and ODI were significantly more improvement in Experimental group than in the control group (p<0.05). Conclusions: We confirmed that the effects of lumbar stabilization exercise with kinesio taping group on pain, muscle strength, and ODI in patients with chronic low back pain.

• Journal of muscle and joint health
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• v.30 no.3
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• pp.242-253
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• 2023

Purpose: The purpose of this study was to identify factors associated with physical activity in older adults living alone. Methods: This is cross-sectional, correlational study used secondary data from the 2019 Community Health Survey. The participants were 19,134 older adults aged 65 years or older and living alone. Data were analyzed using descriptive statistics, the 𝜒² test, and linear regression with the SPSS/WIN 27.0 program. Results: The participants' average amount of physical activity was 1,359.32 MET-min/week; 50.7% were inactive, 38.6% were minimally active, and 10.7% were health-promoting active. Demographic factors that predicted physical activity were gender, age, education level and monthly income, whereas health behavior factors included subjective health status and high risk drinking (R²=.055, p<.001). Psychological factors were sleeping time, stress, depression and fear of falling, and social factors included social contact with neighbors or friends, and participation in social or leisure activites(R²=.070, p<.001). Conclusion: It is important to determine the level of physical activity in older adults living alone. Demographic characteristics, health behaviors, psychological factors, and social factors should be considered in the development of specific and integrated nursing interventions to increase physical activity in older adults.

• The Korean Journal of Pain
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• v.34 no.4
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• pp.454-462
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• 2021

Background: This study was performed to reveal the relationships between the cross-sectional areas (CSAs) of the paraspinal muscles and the severity of low back pain (LBP), including the level of disability. Methods: This single-center cross-sectional study was conducted on 164 patients with chronic LBP. The effects of demographic characteristics, posture, level of physical activity, disc herniation type, and sarcopenia risk on the CSAs of paraspinal muscles were evaluated along with the relationship between the CSAs and severity of pain and disability in all patients. The CSAs of paraspinal muscles were evaluated using the software program Image J 1.53. Results: A negative significant correlation was found between age and the paraspinal muscle's CSA (P < 0.05), whereas a positive correlation was present between the level of physical activity and the CSA of the paraspinal muscle at the L2-3 and L3-4 levels. The CSAs of paraspinal muscles in patients with sarcopenia risk was significantly lower than those in patients without sarcopenia risk (P < 0.05). The CSAs of paraspinal muscles at the L2-3 and L3-4 levels in obese patients were significantly higher than those in overweight patients (P = 0.028, P = 0.026, respectively). There was no relationship between the CSAs of paraspinal muscles and pain intensity or disability. Conclusions: Although this study did not find a relationship between paraspinal CSAs and pain or disability, treatment regimens for preventing paraspinal muscles from atrophy may aid pain physicians in relieving pain, restoring function, and preventing recurrence in patients with chronic LBP.

• Journal of muscle and joint health
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• v.18 no.1
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• pp.5-15
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• 2011

Purpose: Osteoporosis is often considered as a women's disease, but men's osteoporosis is also increasingly recognized as an important public health problem. This study was carried out to identify the important modifiable risk factors for osteoporosis in men. Methods: Two hundred and fourteen men were selected among those who checked bone mineral density by dual energy x-ray absorptiometry in lumbar vertebrae from June to September, 2009 at 3 general hospitals in Busan. Self-administrated questionnaires and BMD results of lumbar vertebrae were used for data. Collected data were analyzed by using SPSS 14.0 program. Results: The sports activity level in 30's, body weight, and fracture history of mother were the most powerful influencing factors on the bone mineral density of lumbar vertebrae. Conclusion: These results highlight the need to participate vigorously in sports activity during 30s as a means of increasing peak bone mass in lumbar vertebrae in order to prevent osteoporosis and fracture in men.

• Korean Journal of Applied Biomechanics
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• v.32 no.1
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• pp.31-36
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• 2022

Objective: The purpose of this study was to investigate muscle activation according to the four strap lengths in the TRX plank exercise to provide scientific and accurate data on effective training methods. Method: Twenty healthy men who had at least 6 months of weight training experience and could fully adjusted plank exercise, were participate in this study (age: 25.2 ± 3.7 yrs., height: 174.2 ± 3.9 cm., weight: 71.2 ± 9 kg). To pursue the study purpose, surface electrodes were attached to trunk muscles (pectoralis major, rectus abdominis, external oblique, internal oblique, erector spinae, latissimus dorsi) and lower extramity muscles (gluteus maximus, rectus femoris, gastrocnemius), and the muscle activity was measured using 11-channel electromyography equipment. In order to verify the muscle activation according to the four strap lengths during TRX plank exercise, an one-way ANOVA with repeated measure was used with statistical significance level set at as α=.05. Results: First, there were statistically significant differences in pectoralis major, rectus abdominis, external oblique, internal oblique, and erector spinae among TRX strap lengths. Second, there were statistically significant differences in gluteus maximus, rectus femoris, and gastrocnemius among TRX strap lengths. Third, even though no statistically significant difference found in latissimus dorsi, but increased muscle activation tendency was showed as the length of the strap increased. Conclusion: From the results of this study, it may be possible that TRX exercise prevent injuries and improve lower extremity muscle as well as trunk muscles by setting appropriate length of strap.

• Animal Bioscience
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• v.37 no.4
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• pp.697-708
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• 2024

Objective: The objective of this study was to investigate the influence of dietary supplementation of Eucommia ulmoides leaf extract (ELE) on muscle metabolism and meat quality of pigs with and without pre-slaughter transportation. Methods: In a 43-day feeding experiment, a total of 160 pigs with an initial body weight 60.00±2.00 kg were randomly assigned into four groups in a completely randomized design with 10 replicates. Pigs in groups A and C were fed a basal diet and pigs in groups B and D were fed a basal diet supplemented with 0.5% ELE. Pigs were slaughtered with (group B and D) or without (group A and C) pre-slaughter transport. Muscle chemical composition, postmortem glycolysis, meat quality and muscle metabolome were analyzed. Results: Dietary ELE supplementation had no effect on the proximate composition of porcine muscle, but increased free phenylalanine, proline, citruline, norvaline, and the total free amino acids in muscle. In addition, dietary ELE increased decanoic acid and eicosapentaenoic acid, but decreased heptadecanoic acid, oleic acid, trans-oleic acid, and monounsaturated fatty acids in muscle. Meat quality measurement demonstrated that ELE improved meat water holding capacity and eliminated the negative effects of pre-slaughter transport on meat cooking yield and tenderness. Dietary ELE reduced muscle glycolytic potential, inhibited glycolysis and muscle pH decline in the postmortem conversion of muscle to meat and increased the activity of citrate synthase in muscle. Metabolomics analysis by liquid chromatographic tandem mass spectrometric showed that ELE enhanced muscle energy level, regulated AMP-activated protein kinase (AMPK) signaling, modulated glycogenolysis/glycolysis, and altered the metabolism of carbohydrate, fatty acids, ketone bodies, amino acids, purine, and pyrimidine. Conclusion: Dietary ELE improved meat quality and alleviated the negative effect of pre-slaughter transport on meat quality by enhancing muscle oxidative metabolism capacity and inhibiting glycolysis in postmortem muscle, which is probably involved its regulation of AMPK.