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중합방법이 의치상용 레진의 이축 굽힘 강도에 미치는 영향
고영호(Young-Ho Ko),김규리(Gyu-Ri Kim),임용운(Yong-Woon Im),이해형(Hae-Hyoung Lee) 대한치과재료학회 2013 대한치과재료학회지 Vol.40 No.4
The aim of this study was to investigate the effect of various curing methods on the biaxial flexural properties of denture base resins. The following heat-curing denture resins were examined: VT (Vertex RS), PD (Paradent 20), and LU (Luciton 199). Denture base resin disk specimens (19.5±0.05 mm in diameter and 1.95±0.05 mm in thickness) were prepared with the following methods: boiling in water bath (BW), heating in air (HA), and microwave polymerization (MP). After storage in 37°C water for 48 h, the biaxial flexural test of denture base resin disks was conducted according to ASTM C1499 at a loading rate of 5 mm/min. Overall, the biaxial flexural properties of resins were significantly influenced with the resin materials used or the polymerization methods, and also their interaction was significant (P<0.05). The biaxial flexural strength and modulus of VT resin prepared by BW were significantly higher than those by HA or MP methods (P<0.05). The biaxial strength of VT was significantly lower than those of PD and LU, regardless of curing methods. Polymerization methods did not produce any significant difference in the biaxial properties of PD and LU. In conclusion, the three polymerization methods, BW, HA, and HA can be successfully used to fabricate denture base without compromising in their flexural strength and modulus.
복합운동이 고혈압 환자의 신체조성, 혈압 및 인슐린 저항성에 미치는 영향
고영호(Ko, Young-Ho),이창준(Lee, Chang-Joon),신덕수(Shin, Doug-Soo) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.6
The purpose of this research was to examine the effect of combined exercise on body composition, blood pressure(BP) and insulin resistance in hypertensive patients. 40 subjects were divided into combined exercise (n=20) and control (n=20) groups. The combined exercise was composed of aerobic and resistance exercise program. Body composition, BP, insulin resistance of all subjects were measured at before and after the program participation. Body weight, % body fat, waist circumference, systolic and diastolic BP were significantly decreased within exercise group, and exercise group was shown that there were significant differences of % body fat, waist circumference and lean body mass, and BP, compared with control group. However, insulin resistance was not shown that there was any significant difference within and between group. In summary, combined exercise could improve the levels of body composition and BP.
Streptozotocin유도 당뇨병 흰쥐의 6주 고강도 트레이닝이 항산화효소와 염증관련 Cytokines의 발현에 미치는 영향
고영호(Ko, Young-Ho) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.4
The purpose of this study was investigate the effects of high intensity endurance exercise on expression of antioxidant ensymes and inflammatory cytokines in diabetic rats whose symptom was induced through the use of 50 ㎎/㎏ streptozotocin, 28 white rats were experimented. rats in four groups exercised(Control, n=7, Control-Training Exercise, n=7, Streptozocin, n=7, Streptozocin-Training Exercise, n=7) on a treadmill run with an intensity of 27m/min, 10°intensity inclination five times for a week during 6 weeks. Mer exercise training, blood glucose(p<.05) were significantly decreased in diabetic exercise groups. SOD, IL-10 levels(p<.05) were significantly increased and MDA, TNF-α, IL-6 levels(p<.05) were significantly decreased after high intensity exercise training. However, IL-1β and IL-4 levels(p<.05) were no significantly increased after exercise training. These findings indicate that the regular physical exercise has marked anti-inflammatory effects on diabetic mellitus.