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CHANGES IN THERMAL INSULATION DURING UNDERWATER EXERCISE
박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1988 고신대학교 의과대학 학술지 Vol.4 No.1
1. Steady-state thermal insulation was measured in protected and unprotected subjects during rest and exercise in water of critical temperature. 2. In unprotected subjects, maximal body insulation at rest increased as a linear function of mean subcutaneous fat thickness. In all subjects, howeer, body insulation declined as an exponential function of the exercise intensity, reaching approximately 25% of the resting value at work loads above 4 Met. These suggest that over 75% of maximal body insulation in resting subjects is achieved by use of skeletal muscle as an insulative barrier. 3. In wet-suited subjects, the overall insulation decreased to 1/2 with 2 Met and to 1/3 of the resting value with 3 Met exercise. This decrease in total insulation was due in part to the decrease ini insulation afforded by wet-suits. The reduction in apparent suit insulation during exercise may be attributed primarily to an increase in the effective heat exchange surface area as a result of exercise hyperemia of the limbs which are poorly insulated as compared with the trunk. 4. As a practical consequence, both in protected and unprotected individual, heat generated by muscular exercise in water colder than critical temperature cannot offset cooling unless the exercise intensity is great.
ENERGETICS AND THERMOREGULATORY FUNCTIONS IN KOREAN WOMEN WET SUIT DIVERS
박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1985 고신대학교 의과대학 학술지 Vol.1 No.1
Korean women divers have dived for sea food in all seasons wearing only cotton swimsuits. Previous studies conducted in the 1960's indicated that these women divers subjected themselves to a daily cold water stress greater than that of any other human beings and that they had developed an unique pattern of cold acclimatization. However since 1977 Korean women divers have adopted wet suits to avoid cold water stress during diving work. We therefore conducted a series of experiments from 1980 to investigate the effect of wearing wet suits on the thermoregulation of contemporary women divers. The results of some of these investigations are presented below.
THERMOREGULATION IN WET SUIT DIVERS
박양생,최장규,Yeon. D. J,Suh Kim,H.J.Kim 고신대학교(의대) 고신대학교 의과대학 학술지 1986 고신대학교 의과대학 학술지 Vol.2 No.1
Thermoregulation of wet suit divers were studied during breath-hold diving in the sea and during exercise in temperature regulated water bath in 1, 2 and 3 ATA. 1) Duringbreath-hold diving, heat loss in Korean women wet wet suit divers was more than 96% compensated by heat production, thus rectal temperature was decreased by only 0.4℃ in summer (22.5℃ water) and 0.6℃ in winter (10℃ winter) during 2hr diving work. 2) During immersion in cold water(14~19.5℃), total thermal insulation of the wet suit diver decreased as an exponential function of the exercise intensity, thus the steady state rectal temperature was not different whether the subject exercised or not. 3) The apparent insulation afforded by the wet suit decreased as a function of pressure, and at the same pressure it decreased as a function of exercise intensity. 4) Practical consequence of these results will be discussed.
ENERGETICS AND THERMOREGULATORY FUNCTIONS IN KOREAN WOMEN WET SUIT DIVERS
Park, Yang Saeng 고신대학교 의학부 1985 高神大學校 醫學部 論文集 Vol.1 No.1
Korean women divers have dived for sea food in all seasons wearing only cotton swimsuits. Previous studies conducted in the 1960's indicated that these women divers subjected themselves to a daily cold water stress greater than that of any other human beings and that they had developed an unique pattern of cold acclimatization(2). However since 1977 Korean women divers have adopted wet suits to avoid cold water stress during diving work. We therefore conducted a series of experiments from 1980 to investigate the effect of wearing wet suits on the thermoregulation of contemporary women divers(5, 7). The results of some of these investigations are presented below.
카드뮴에 중독된 토끼의 신장 기저막소포에서 Succinate 이동에 대한 동력학적 연구
김광휘,박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1992 고신대학교 의과대학 학술지 Vol.8 No.1
-Abstract- Changes in transport kinetics of succinate were studied in renal basolateral membrane vesicles(BLMV) isolated from cadmium-intoxicated rabbits. Cadmium intoxication was induced by subcutaneous injections of CdCl₂ at a dose of 3mg/kg·day over 3 weeks. Basolateral membrane vesicles were prepared from renal cortex by Percoll gradient centrifugation. Cadmium intoxication resulted in marked attenuation of Na⁺-dependent transport of succinate in basolateral membrane vesicles, and this was due to reduction in Vmax and to increase in Km. These results indicate that cadmium intoxication impairs the Na⁺-succinate cotransport system in the basolateral membrane of renal proximal tubular cells.
EFFECTS OF GENTAMICIN ON THE SHORT-CIRCUIT CURRENT ACROSS THE ISOLATED FROG SKIN
홍성원,박양생 고신대학교(의대) 고신대학교 의과대학 학술지 1986 고신대학교 의과대학 학술지 Vol.2 No.1
상피 조직의 Na 이동에 미치는 gentamicin(GM)의 영향을 연구하기 위하여 Ussing과 Zerahn의 방법에 따라 적출된 개구리 피부에서 short-circuit current(SCC)와 산소 소모능에 대한 GM의 영향을 조사하였다. GM을 투여하지 아니했을 때 SCC는 초기에 서서히 감소하다가 40-60분 후에 249.1㎂/3.14cm² 내외로 안정되었다. 피부 내측에 GM을 0.1, 0.2, 0.5, 그리고 1.0mg/ml 농도로 각각 투여했을 때 초기(10분)에는 SCC가 증가하였으나 그후 서서히 감소하여 약 60분 후에는 각각 약물투여 전의 88, 84, 82 및 75%가 되었다. 그러나 GM을 피부 외측에 투여했을 때는 0.1mg/ml에서 51%, 0.2mg/ml에서 37%, 그리고 0.5-1.0mg/ml에서 16-17% 정도 SCC가 증가하였다. 한편 피부 내측과 외측에 GM을 0.1mg/ml 농도로 동시에 투여했을 때는 약물투여 전보다ㅏ SCC가 15% 정도 증가했는데, 이러한 증가는 상피세포 외측 막의 Na이동에 대한 GM의 영향과 내측막의 Na이동에 대한 GM의 영향이 합쳐진 결과 나타난 것으로 보여진다. SCC에 대한 영향이 상대적으로 가장 큰 GM농도(0.1mg/ml)에서 개구리 피부의 산소 소모율은 대조군과 별다른 차이를 보이지 아니했다. 이상의 성적으로 보아 GM은 개구리 피부 상피세포의 외측막에서 Na 투과도를 증가시키며 내측막에서는 능동적 Na이동을 감소시키는 것으로 사료된다.