• 운동영양학회지
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• 제23권1호
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• pp.1-6
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• 2019

[Purpose] To date, there have been no studies on the response of wrist tremor to increased muscle activity during exercise. This study aimed to evaluate the wrist tremor response with increasing muscle activity during bench press exercise. [Methods] Triceps muscle activity and wrist tremor response were measured by electromyography and an accelerometer, respectively, during bench press exercise in 11 healthy men without weight-training experience. Subjects performed bench press at 30% repetition maximum (RM), and the rating of perceived exertion (RPE) and lactate concentration were measured before and after exercise. One week later, an equivalent number of bench presses at 30% RM was performed without weight load as a control trial (CT). [Results] RPEs and lactate concentrations significantly increased after resistance exercise (30% RM) from 7.4 to 14.3 and 1.7 to 4.9, respectively (P<.01), but no such difference was observed in the CT. Muscle activity linearly increased during the 30% RM exercise, and wrist tremors were shown to linearly decrease. A strong negative correlation was observed between the two variables (r=-0.88, P<.001). [Conclusion] We found that wrist tremors during resistance exercise, as measured using an accelerometer, can be used to predict muscle activity.

• 대한임상전기생리학회지
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• 제7권1호
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• pp.35-42
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• 2009

Purpose : The purpose of this study was to investigate the effects of Swiss ball lumbar stabilization exercise on the strength and flexibility, balance for the subjects. 30 university students who aged an average $23.21{\pm}4.41$ years. Methods : The exercise program lasted for 4 weeks with a frequency of 3 times per week within 12 to RPE. The result was analyzed by case study were measured by sit-up for strength, and back muscle strength, and trunk flexion test and trunk extension lifting for flexibility, and also measured by balance test before and during, and after the Swiss ball exercise program. Statistical analysis was performed using SPSS/Win(15.0) version and t-test. Results : By the result of this study, we found that the number of performing sit-up strength was increased, and back muscle strength was increase, and trunk flexion test and trunk extension lifting was increased after the 4 weeks Swiss ball exercise program. Conclusion : These finding indicate that Swiss ball lumbar stabilization exercise using Swiss ball could be beneficial to the subjects. The effect of increasing strength and flexibility, balance was flexibility.

• 산업공학
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• 제17권1호
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• pp.46-55
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• 2004

Various characteristics of the object being lifted are known to affect the biomechanical, physiological, and psychophysical stresses. The object characteristics to be considered in the design process of lifting tasks are weight, shape, stiffness, and availability of handles and similar coupling devices. In this study, a prototype Polypropylene laminated bag with carrying handles was designed to decrease the physical stress of people who handle these bags. Physiological and psychophysical approaches as well as subjective ratings were applied to evaluate the effects of handles provided on the designed PP laminated bag. Statistical analysis showed that the VO2, heart rate, blood pressure, and Borg-RPE score for PP laminated fertilizer bag with carrying handles were significantly lower than those bags without handles. Moreover, Maximum Acceptable Lifting Endurance Time(MALET) measure, newly developed in this study, for bags with handles was significantly higher than those for bags without handles. It is thus recommended that the various types of bags and boxes be equipped with handles to reduce the musculoskeletal, physiological, psychophysical, and subjective perceived stresses.

• 한국응용과학기술학회지
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• 제34권3호
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• pp.587-594
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• 2017

The purpose of this study was to investigate the effect of rope skipping and band exercise on GH, IGF-1 and metabolic syndrome risk factors in female obese middle school students. Twenty female obese middle school students(%BF > 30%) were randomly assigned to a exercise group(EX, n=10) or control group(CON, n=10). The exercise group has performed rope skipping and band exercise for 12 weeks, 3time per week. Exercise intensity was increased gradually, from 40% to 70% of Heart Rate Reserve(HRR) and Rating of Perceived Exertion(RPE) 11-15. GH, IGF-1 and metabolic syndrome rist factors were GH, IGF-1 and metabolic syndrome risk factors were measured pre- and post-exercise program including rope skipping and band exercise. Levels of GH and IGF-1 were significantly increased (p<.01 and p<0.001, respectively) in exercise group after 12 weeks of exercise training. WC and TG were significantly decreased(p<.01) in exercise group after 12 weeks of training. HDL-C was significantly increased(p<.05) in exercise group after 12 weeks of training. In conclusion, rope skipping and band exercise were effective exercise program in improving GH, IGF-1 and metabolic syndrome risk factors in female obese middle school students.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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• pp.899-903
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• 1994

This paper describes two methods to assess the output speech, quality of vocoders for telephone conferencing in digital mobile communication networks. The proposed methods are the sentence discrimiantion method and the modified degraded mean opinion score (MDMOS) test. We apply these two methods to Qualcomm code excited linear prediction (QCELP), vector sum excited linear prediction (VSELP) and regular pulse excited-long term predictin (RPE-LTD) voceders to evaluate which vocoding algorithm can process mixed voice signal from two speakers better for telephone conferencing. From the experiments we obtain that the VSELP vocoding algorithm reveals superior output speech quality to the other two.

• Nuclear Engineering and Technology
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• 제55권6호
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• pp.2166-2171
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• 2023

In the present study, six silicone rubber doped by tellurium borate oxides were fabricated using the casting method. The densities of the fabricated silicon rubber-doped by tellurium borate oxides samples were measured using the Archimedes Method. Moreover, the linear attenuation coefficient of silicone rubber doped tellurium borate oxides samples was evaluated experimentally using the hyper pure germanium, and the recorded linear attenuation coefficient values were affirmed using the theoretical Phy-X program. The experimental measurements were performed using the narrow beam transmission method with radioactive isotopes Am-241, Cs-137, and Co-60 with energies of 59, 661, 1173, and 1332 keV. The linear attenuation coefficient values showed an enhancement by 4.73 times, 1.20 time, 1.17, time, and 1.17 time, respectively at gamma photon energies of 59, 661, 1173, and 1332 keV, when the TeO₂ concentration increased in the fabricated composites from 0 to 50 wt%. The enhancement of the linear attenuation coefficient values has a positive effect on the transmission rate values where the half-value thickness and transmission rate were decreased accompanied by an increase in the RPE.

• Safety and Health at Work
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• 제10권3호
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• pp.275-304
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• 2019

Background: Air-purifying, tight-fitting facepieces are examples of respiratory protective equipment and are worn to protect workers from potentially harmful particulate and vapors. Research shows that the presence of facial hair on users' face significantly reduces the efficacy of these devices. This article sets out to establish if an acceptable seal could be achieved between facial hair and the facepiece. The team also created and investigated a low-cost "pressure testing" method for assessing the efficacy of a seal to be used during the early design process for a facepiece designed to overcome the facial hair issue. Methods: Nine new designs for face mask seals were prototyped as flat samples. A researcher developed a test rig, and a test protocol was used to evaluate the efficacy of the new seal designs against facial hair. Six of the seal designs were also tested using a version of the conventional fit test. The results were compared with those of the researcher-developed test to look for a correlation between the two test methods. Results: None of the seals performed any better against facial hair than a typical, commercially available facepiece. The pressure testing method devised by the researchers performed well but was not as robust as the fit factor testing. Conclusion: The results show that sealing against facial hair is extremely problematic unless an excessive force is applied to the facepiece's seal area pushing it against the face. The means of pressure testing devised by the researchers could be seen as a low-cost technique to be used at the early stages of a the design process, before fit testing is viable.

• 대한통합의학회지
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• 제8권4호
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• pp.133-142
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• 2020

Purpose : The purpose of this study was to investigate the effective recovery method of exercise-induced fatigue and muscle pain by comparing the effect of the use of illite hot mat product and general hot mat product on the recovery of muscle pain induced by high intensity exercise. Methods : To measure and analyze the changes in lactic acid, CRP, and ACR according to the high-intensity circuit training program, this study was conducted for the healthy adult men and women, who exercise st the K-region sports center. A total of 45 subjects were studied in 15 groups of 15 patients who received an illite hot-water mat recovery group (A group), 15 general hot-water mat recovery group (B group), and 15 control group (C group). The circuit training exercise program was conducted as a one-time exercise, and each exercise time consisted of 30 minutes of warm-up exercise, 5 minutes of main exercise, 20 minutes of clean-up exercise, and 5 minutes of strength exercise. The intensity setting was high intensity of subjective exercise intensity It carried out by setting to (14-16RPE). Results : Changes in Lactic Acid Concentration There was a significant difference in the lactic acid concentrations between the groups after the high intensity circuit training program (p <.05). The illite rest group (A) decreased 7.71 mmol / L and the control group decreased 4.03 mmol / L. Significantly decreased (p <.05). Changes in ACR Concentration. There was a significant difference in the ACR concentrations Significant differences were found in CRP and ACR during the recovery period after exercise. (p <.05), the elite rest group (A) decreased 2.47 mg / mmol, and the control group increased 1.63 mg / mmol. There was a significant difference (p <.05). Conclusion: The static rest on a heated mat after high-intensity exercise has an effect on changes in blood lactate and ACR levels.

• 한국안전학회지
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• 제23권6호
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• pp.150-157
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• 2008

The purpose of this study was to investigate the effect of short-tenn stretching type of muscular strength gymnastics on health-related fitness and rating of perceived pain for automotive industry workers. The subjects selected were 27, who were divided into 3 groups(A group=10, B group=9, C group=8). Group A performed a short-term stretching Type of Muscular Strength Gymnastics only one time. Group B continuously performed the exercise program two times. Group C was a control group. The exercise program was a stretching Type of Muscular Strength Gymnastics, which was performed 3 times per week for 4 weeks. Its intensity was RPE 11-15. Data analysis was conducted by using SPSS ver 14.0. The test was conducted with two-way repeated ANOVA, post-hoc Ducan and paired t-test (a<.05). This study showed the following results. Muscular strength, muscular endurance and flexibility increased in all intra and between groups. Ratio of %fat decreased for group B but the control group presented conversely. Rating of perceived pain of group A decreased at arm and hands. Rating of perceived pain of group A decreased at back and leg.

• 한국축산식품학회지
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• 제44권3호
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• pp.699-709
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• 2024

Oxya chinensis sinuosa (OC) is a well-known edible insect. Several researches on the health benefits of OC consumption have been performed to date; however, their effect on eye health remains largely unknown. This study aimed to assess the protective effects of OC extracts on the oxidative stress on the retinal pigment epithelium (RPE) cells. Oxidative damage has been identified as one of the key regulatory factors in agerelated macular degeneration. H₂O₂-induced reactive oxygen species (ROS) production, a well-known oxidative stress factor, can cause cell death in retinal pigment epithelia cells. In this study, we found that three OC extracts effectively prevented H₂O₂-induced ROS production and subsequent death of ARPE-19 cells in a dose-dependent manner. In addition, the OC extracts inhibited the phosphorylation of mitogen-activated protein kinases including p38, JNK, and ERK. The OC extracts restored IκBα degradation induced by H₂O₂, indicating that OC extracts suppressed the activation of nuclear factorκB. Furthermore, the three OC extracts were shown to have antioxidant effects by upregulating the intracellular expression of key antioxidant proteins such as SOD, NQO, and HO-1. Here we demonstrated the antioxidant and anti-apoptotic effects of the OC extracts on ARPE-19, indicating their potential role in improving eye health. These results suggest that three OC extracts plays a critical role in oxidative stress-induced cell death protects in ARPE-19 cells.