• Journal of Korean Physical Therapy Science
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• v.6 no.4
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• pp.221-227
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• 1999

This study is about the correlation of pain strength between Oswestry Disability Index and Hendler 10-Minute Screening Test in the patient of low back pain. The subject were 66, in and out patient who had recieved physical therapy on low back pain in several hospitals at Seoul and Kyungkido. during July 5.-August 27. 1999 1. The average score of Oswestry Disability Index was $24.06{\pm}8.16$ and that of Hendler 10-Minute Screening Test was $24.82{\pm}4.31$. 2. The Pearson's R score between each questionnaires of Oswestry Disability Index and pain strength was .5692. p<0.0001. So it is very high. But, that between each questionnaires of Hendler 10-Minute Screening Test and pain strength was not significant.. 2261 p<0.05 3. The Pearson's R score between Pain strength of Oswestry and person care was .3391, sex life was .3756, social life was .4637 (p<0.005) and that between Pain factor of Hendler, pain area of Hendler and sleeping(4358), sex(.6198), position change(2767), (p<0.005). So it is significant. 4. The categories where we could see the correlation between Pain strenth of Oswestry and Hendler each questionnaires were sleeping(.3222), sex(5524), position change(4291). (p<0.005).

• Journal of the Korean Ceramic Society
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• v.34 no.10
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• pp.1027-1036
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• 1997

The reology and several physical properties of cements are studied by varying the different mineral composition and particle size distribution(PSD) of cements with closed circuit ball mill for high workability, low heat of hydration, and high strength. In this study, we found that the workability of concretes is related to the viscosity of cement, and affects to strength. Here, this workability is affected by mineral composition (C3A) and the PSD. Especially, rosin-rammer index and 44${\mu}{\textrm}{m}$ residue in the PSD of cements are affected to water demand, casting property, slump loss, strength of cements. From the above results, the conditions of cement for high workability, low heat of hydration and high strength are to use low C3A clinker, 5-10% slag addition, and to grind cement below 0.7 rosin-rammer index, above 3.5-4.5% 44 ${\mu}{\textrm}{m}$ residue, 4000$\pm$100 $\textrm{cm}^2$/g blaine. Such cements are, therefore, supurior to super low heat cement and slag-blended cement in comparing the physical properties of strength, slump, slump-flow, adiabetic temperature, etc.

• The Journal of Korean Physical Therapy
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• v.22 no.4
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• pp.73-81
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• 2010

Purpose: The purpose of this study was (1) to examine the effects of a Health Promotion Exercise Program (HPEP) on functional improvement, physical strength (PS) and muscle activation (MA), and the interactive influence with activities of daily living (ADL) and instrumental activities of daily living (IDAL) in the elderly, and (2) to develop and provide a HPEP for the elderly in order to prevent declines and impairments in integrated nerve function and physical capacity. Methods: Our study included relatively healthy elderly people aged 65 years or older. The experimental group, which was composed of 30 people, participated in a HPEP 50~60 minutes a day, 3 times a week, for a total of 12 weeks. Results: Confirmatory factor analysis (CFA) validated the measurement models for MA, physical strength, ADL and IADL with a p<0.01. This confirms (i) the beneficial effects of the ADFP on their MA and PS, and (ii) that their improvement in PS, in turn, can improve their IADL. The results of this study indicates that ADFP can help Korean seniors 65 years or older improve their MA, PS, ADL, and IADL, and do so synergistically. Conclusion: An HPEP, when organized in such a way that the elderly can easily do it, and when exercise items and intensity can be programmed and reorganized accordingly to individual physical and physiological characteristics by presenting 5 categorized health domains of physical strength, may be useful, especially because it can be practiced irrespective of time and place.

• Journal of the Korean Society of Tobacco Science
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• v.22 no.1
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• pp.99-106
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• 2000

In order to investigate the applicability of lyocell fiber to filter paper, papper sheets were manufactured with the addition of lyocell fibers in various length(1.5 denier: 2, 3, 4mm) and content(10, 30, 50%) and their physical characters, such as fibrilation rate, adsorption efficiency of methylene blue(MB), paper formation, and crimping ability, etc, were tested. The level of main fibrilation from lyocell fiber was higher in wet beating process than that in free beating because of the higher strength of lyocell fiber compared with wood fiber. Fibrilation could be observed at the degree of beating over 30$^{\circ}$ SR in wet beating with Valley beater. The air permeability and tear factor of the paper increased and the paper formation index decreased according to the increase of fiber length. The weak binding force of lyocell fiber in spite of its higher fiber strength, might be a limitng factor in addition of lyocell fiber to the natural wood pulp in manufacturing the paper having the needed physical properties. High contents of wood pulp decreased air permeability, the breaking length, tear factor, the bursting strength, and paper formation index in paper sheets. As the contents of lyocell increased from 10% to 100%, the adsorption efficiency of MB was elevated to 1.7-7.9 times compared with that in 100% wood pulp. But the length of lyocell fiber did not affect the MB adsorption.

• Proceedings of the Korean Geotechical Society Conference
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• 2008.10a
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• pp.1069-1080
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• 2008

The mechanical characteristic of Lightweight Foamed Soil(LWFS) are investigated in this research. LWFS is composed of the in-suit soil, cement and foam to reduce the unit-weight and increase compressive strength. The unconfined compressive tests are carried out on the prepared specimens of LWFS with various soil types to investigate the relationship between compressive strength of LWFS and physical properties of soil. The result indicate that coefficient of gradation($C_g$) and liquid limit(LL) are more important factor affecting compressive strength than other physical properties of soil and coefficient of gradation($C_g$) and liquid limit(LL) can standard to determine the optical soil among the in-situ soils for LWFS.

• Journal of the Korean Society of Physical Medicine
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• v.13 no.2
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• pp.157-165
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• 2018

PURPOSE: The purpose of this study was carried out to investigate the effect of plyometric training combined with core strength training on the balance and agility of adolescent soccer players. METHODS: A total of 36 subjects participated in this study. Subjects were randomly divided 3 groups and assigned PG (plyometric training group), CSG (core strength training group) and PCG (plyometric training combined with core strength training group). Each group was assigned to 12. Intervention was performed three times a week for 4 weeks. The training was performed for 60 minutes a day. Subjects were warmed up for 10 minutes, and performed main exercise for 40 minutes. Finally, subjects performed cool-down exercise including stretching for 10 minutes. A Statistical analysis was performed the paired t-test for the comparison pre and post intervention. A comparison among the groups was using one-way ANOVA, and the LSD was used for the post-test. RESULTS: The balance and agility were statistically significant differences in all group (p<.05). There was no significant difference in the balance factors between the three groups, but there was a significant difference in the agility factor (p<.05). CONCLUSION: Plyometric training and plyometric training combined with core strength training were effective for the balance and agility of adolescent soccer players.

• Journal of the Korean Society of Physical Medicine
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• v.19 no.3
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• pp.81-89
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• 2024

PURPOSE: This study was conducted to provide evidence-based recommendations for customized interventions by identifying the incidence of low grip strength (LGS) in an elderly population in Korea. METHODS: Adults over 65 years of age were selected as subjects using the data from 2016-2018 of the Korea National Health and Nutrition Survey provided by the Korea Centers for Disease Control and Prevention. Of the 24,269 subjects who participated in the survey, 19,313, 533, and 2664 participants who were under the age of 65, did not take the grip strength test, and did not take the health survey, respectively, were excluded. Finally, 1,759 subjects were selected. RESULTS: The incidence rate of LGS was 30.27%: 22.82% in men and 38.48% in women. The related factors of LGS had a high risk of occurrence of old age, low education level, low BMI, alcohol status, aerobic and muscle strength exercise, and low high-density lipoprotein cholesterol (HDL-C). CONCLUSION: This study provided basic data for introducing health promotion policies to improve the grip strength of the elderly in consideration of related factors affecting LGS.

• Journal of Industrial Convergence
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• v.19 no.4
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• pp.111-126
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• 2021

The purpose of this study was to investigate the effects of 12-week training on changes in physical fitness and cardiovascular factors for firefighters. For this purpose, 40 men in their 20s and 30s who agreed to participate voluntarily were recruited. They were divided into four groups: the firefighters' physical fitness test training group (hereinafter referred to as PT group), firefighters' physical fitness test and aerobic training group (hereinafter referred to as PT+AR group), firefighters' physical fitness test and both aerobic and anaerobic training group (hereinafter referred to as PT+CO group). Physical fitness factors (grip strength, back muscle strength, seated forward bend, standing long jump, sit-ups, 20-meter shuttle run), cardiovascular factors (total cholesterol, triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, glucose, waist circumference, systolic blood pressure, diastolic blood pressure) and the relationship between Framingham Heart Risk Score and physical/cardiovascular factors were compared and analyzed, and the following conclusions were obtained. Aerobic training, anaerobic training, and combined training, including 12 weeks of firefighter physical examinations, all had positive effects on fitness and cardiovascular factors, which would be an appropriate way for firefighter examinees to improve physical strength and reduce the risk of cardiovascular disease.

• The Journal of Korean Physical Therapy
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• v.18 no.5
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• pp.43-51
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• 2006

Purpose: The purpose of this study was to examine the effects of static stretching and Evjenth-Hamberg stretching on isokinetic muscle strength of knee flexors and extensors. Methods: The subjects were composed of eighty healthy males without weight-training experience. ROM of knee joint measured active maximal extension and isokinetic Peak Torque measured $60^{\circ}/sec,\;120^{\circ}/sec$ using an the En-Knee. Three tests(Baseline, 4 weeks, 8 weeks, respectively) was operated to examine change of each variable. Data were analyzed with a $2{\times}3$ analysis of variance ($group{\times}test$) for repeated measures on last factor by SPSS package 10.0. The data analysis revealed muscle strength were dependent on stretching method. Results: The results were as follows. First, Evjenth-Hamberg stretching(E-HS) was more effective than static stretching(SS) on ROM. Second, Peak Torque of knee flexors and extensors was improved in both methods by each time. but E-HS was more improved than SS. Conclusion: In conclusion, This study indicates that E-HS is more efficient than SS on muscle strength improvement.

• Journal of International Academy of Physical Therapy Research
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• v.4 no.2
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• pp.557-561
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• 2013

The purpose of this study to identified the effect of muscle strengthening of ankle joints on postural sway. The subjects of this study were 29 healthy adults aged between 20 and 30 years(male 18, female 11). All subjects received ankle muscle strengthening exercise for 3 times, 3 sessions, 30 minutes per week over 4weeks period. The measured item of muscle strength, postural sway. Data collected from all subjects the result were as follows. The ankle strength showed significant increase(p<.05). One leg stand test with eye close increase in static balance(p<.05), left-right sway distance and anterior-posterior sway distance with eye open and close in static balance(p<.05). The result findings show that strength of the ankle joint muscles is a factor which affects postural sway and the ankle joints are important in static balance.