• Korean Journal of Community Nutrition
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• v.7 no.6
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• pp.769-780
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• 2002

The purpose of this study was to identify the differences in dietary consumption patterns according to the exercise level of Korean adults. The study subjects were the 7,370 Koreans aged 20 years and older of the 1998 Korean Health and Nutrition Survey. The dietary assessment was conducted by means of the 24 hour recall method. Data for individual exercise behavior were collected by interviews as part of the National Health Behavior Survey. Following the analysis of variances the Duncan＇s Multiple Range Test was used to test the differences in food and nutrient intakes among groups with different levels of exercise. Current exercise practices were reported by 22% of the male subjects and 15% of the female subjects. Unlike observations from the American and European studies, a greater amount of meat intake was observed more frequently among high exercises group than among middle and low exercisers in the case of the male subjects. This was reflected in the increasing levels of protein and fat intake in proportion to the exercise levels. However, the food and nutrient intake patterns of female exercisers were quite different from those of the males. The least intake of fatty foods was observed among the high exercisers. Energy intake from fat was the lowest among the high exercisers. These results may imply that the motivation to exercise was quite different between male and female Koreans. This dietary pattern may have a risk of undernution. Summerizing the results, whatever the motivation of the exercise, the Korean exercisers of both sexes had unhealthy dietary pattern. Therefore, nutritional education should be conducted to encourage the eating of a balanced diet along with exercise, among Koreans of both sexes, in order to promote a healthy lifestyle.

• Asian-Australasian Journal of Animal Sciences
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• v.9 no.1
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• pp.107-111
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• 1996

Studies on the effects of protein levels on the total sulphur amino acid (TSAA) requirements of chickens were conducted on the starter broilers by feeding four levels of crude protein(16, 18, 20 and 23%) at three levels of TSAA (0.83, 0.93 and 1.03%) and on the grower broilers by feeding three levels of crude protein (16, 18 and 20%) at three levels of TSAA(0.72, 0.79 and 0.86%). The metabolisable energy of the diets was maintained constant at 3,200 kcal/kg and the experiments were carried out for two growing periods: starter (0-3 wk) and grower (3-6 wk). The results showed that there were significant differences in body weight gain, feed intake and feed:gain ratio under different protein levels of the starters. Crude protein, ME and TSAA intake were significantly affected by increasing the CP levels. The TSAA requirement of the starter broilers is recommended at 0.93% and it is not influenced by different protein levels used in the experiment. For the grower period, body weight gain and feed:gain ratio improved significantly at higher protein diets. Birds fed higher protein diet consumed greater quantities of protein. Responses to TSAA supplementation for body weight gain, feed intake and feed:gain ratio were not significant. The present results showed that the TSAA level of 0.79 to 0.86% was required for grower diets and that the protein levels of the diet did not influence the TSAA requirement.

• Journal of the Korean Society of Food Science and Nutrition
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• v.24 no.4
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• pp.530-536
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• 1995

A study was performed to assess dietary intake and serum levels of $\beta$-carotene and the influence of preference for hot taste on $\beta$-carotene intake in Korean female college students. Daily intake of $\beta$-carotene was estimated with a questionnaire composed of food item of high $\beta$-carotene contents and the average daily intake level was 4089$\pm$2400$\mu\textrm{g}$. The major sources of $\beta$-carotene included carrot, pumpkin, spinach, tomatoes and red pepper powder. 14$\pm$10% of total dietary $\beta$-carotene intake was from foods containing red pepper powder. The average amount of red pepper powder added to bean sprout soupr were 0.32$\pm$0.34g. Subjects preferring hot taste added significantly larger amount of red pepper powder(p<0.05) than those not preferring hot taste. Subjects of the lowest quartile of $\beta$-carotene intake level showed the lowest precentage of subjects preferring hot taste. The average serum $\beta$-carotene concentration was 36.5$\mu\textrm{g}$/dl and large variation in the amount among the subject has been observed. The level of dietary $\beta$-carotene intake and serum $\beta$-carotene concentration of Korean female college students were not significantly correlated but both were higher than levels in reports from western countries. These results indicate that $\beta$-carotene intake levels of the subjects are adequate and the preference for hot taste affects $\beta$-carotene intake significantly.

• Nutrition Research and Practice
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• v.6 no.2
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• pp.120-125
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• 2012

The aim of this study was to investigate the influencing factors that characterize low density lipoprotein (LDL) phenotype and the levels of LDL particle size in healthy Korean women. In 57 healthy Korean women (mean age, $57.4{\pm}13.1$ yrs), anthropometric and biochemical parameters such as lipid profiles and LDL particle size were measured. Dietary intake was estimated by a developed semi-quantitative food frequency questionnaire. The study subjects were divided into two groups: LDL phenotype A (mean size: $269.7{\AA}$, n = 44) and LDL phenotype B (mean size: $248.2{\AA}$, n = 13). Basic characteristics were not significantly different between the two groups. The phenotype B group had a higher body mass index, higher serum levels of triglyceride, total-cholesterol, LDL-cholesterol, apolipoprotein (apo)B, and apoCIII but lower levels of high density lipoprotein (HDL)-cholesterol and LDL particle size than those of the phenotype A group. LDL particle size was negatively correlated with serum levels of triglyceride (r = -0.732, $P$ < 0.001), total-cholesterol, apoB, and apoCIII, as well as carbohydrate intake (%En) and positively correlated with serum levels of HDL-cholesterol and ApoA1 and fat intake (%En). A stepwise multiple linear regression analysis revealed that carbohydrate intake (%En) and serum triglyceride levels were the primary factors influencing LDL particle size ($P$ < 0.001, $R^2$ = 0.577). This result confirmed that LDL particle size was closely correlated with circulating triglycerides and demonstrated that particle size is significantly associated with dietary carbohydrate in Korean women.

• Journal of Nutrition and Health
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• v.32 no.5
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• pp.552-560
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• 1999

In this study, we investigated the effects of lowering the fat and cholesterol in the diets of 26 Korean hypercholesteolemic men($\geq$240mg/dl). They consumed 2378kcal/day with 20.9% of the energy deriving from fat, and a cholesterol intake of 282mg(118mg/1000kcal). The experimental diet consisted of 2400kcal, the same as their usual diet, but the fat content was restricted to 15%, and the cholesterol level to below 100mg/1000kcal. The subjects kept to this diet for four weeks and were asked to maintain their usual life activities during the experimental period. The dietary intake and levels of plasma lipid, lipoprotein-cholesterol and apoprotein of the subjects were analyzed before, two weeks into, and after four weeks dietary intervention. After two of the dietary intervention, there were no significant changes of plasma total cholesterol or triglyceride levels but there was some changes of phospholipid level. However, after four weeks, the levels of plasma total cholesterol, triglyceride, and phospholipid had decreased significantly: 18.2%, 32.9%, and 11.9%, respectively. And the LDL-cholesterol and VLDL-cholesterol levels also showed a marked reduction of 18.1%, and 33.0% respectively without change of HDL-cholesterol level. There were no changes in the levels of Apo-A 1, Apo-B, or Lp(a). The changes of the plasma lipid levels were significantly associated with the changes in dietary fat intake but not the cholesterol intake. In conclusion, although the responses to the dietary intervention varied among the individual subjects, the lowering of dietary fat component from 21% to 15% of energy intake seems to be an effective way to reduce plasma cholesterol and triglyceride levels without decreasing HDL-cholesterol level. It was also found that the restriction of dietary cholesterol to below 100mg/1000kcal not seem to be effective for the hypercholesterolemic patient who already consuming below 300mg/day of cholesterol.

• Journal of Nutrition and Health
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• v.29 no.7
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• pp.713-720
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• 1996

To study the effect of caffeine intake levels on iron metabolism, the iron utilization, iron contents of serum, liver, spleen, kidney, hemoglobin and hematocrit were compared in rats of different sex fed various levels of caffeine (3.5 and 7.0mg/100g body weight) for three weeks. There were no significant caffeine induced differences in feed intake, body weight gain but feed intake of male rats were significantly lower than that of female rats. Hemoglobin, hematocrit and iron contents of the serum were not significantly different between caffeine free and caffeine groups or male and female rats. Iron contents of kidney were decreased by elevation of injected caffeine levels rather than those of liver and spleen. caffeine male groups showed more increased uine volume, urinary and fecal excretions of iron than caffeine free or caffeine female groups. Apparent digestibility and retention of iron were significantly decreased by increment of injected caffeine levels. Male rate rats were more susceptible to injected caffeine on iron excretion than female rats. Current findings suggest that excessive caffeine consumption can affect iron excretion via urine and feces thereby decrease the utilization of iron, and have more significant effect on male than female rats.

• Asian-Australasian Journal of Animal Sciences
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• v.20 no.10
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• pp.1567-1574
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• 2007

A study was carried out to study the response of total purine derivatives (PD) excretion in urine to determine microbial N (MN) supply at four fixed levels of feed intake (namely 95, 80, 60 and 40% of voluntary intake). The crossbred (CB) calves were allocated according to a $4{\times}4$ Latin Square Design and fed wheat straw and concentrate (1:1). The rate of PD excretion (mmol/d) as a linear function of feed intake was 15.85/kg DMI and 20.12/kg DOMI. Based on the endogenous and PD excretion rates obtained in this study, a relationship between daily urinary PD excretion (Y, mmol) and daily microbial protein supply (X, mmol) was developed for crossbred calves as Y = 0.83X+0.296 kg $W^{0.75}$. The derived microbial N values using this equation differed (p<0.001) among the 4 groups and was the highest in L-95 followed by L-80, L-60 and L-40. The relationship between urinary nitrogen loss (Y, g/d) and DOMI (X, kg/d) was established as: Y = 6.038X+21.753 ($r^2$ = 0.663, p<0.01). When urinary excretion of PD (Y, mmol/d) was plotted against intake of DM and DOM (X, kg/d), the equations obtained were: Y = 7.1711X+8.674 ($r^2$ = 0.889, p<0.01) and Y = 12.434X+7.683 ($r^2$ = 0.896, p<0.01), respectively. The proportional contribution of allantoin and uric acid to total PD remained stable irrespective of level of feed intake. Similarly, urinary excretion of creatinine did not differ (p>0.05) between animals fed at different levels. The MN supply was the highest to animals at intake levels L-95, and decreased linearly with corresponding decrease in feed intake. However, the MN supply when expressed per kg DOMI remained statistically (p>0.05) similar irrespective of level of intake. The results revealed that the excretion of urinary purine derivatives were positively correlated with the level of feed intake as well as rumen microbial supply and thus it could be a good indicator for measuring the microbial protein supply and nutritional status of animals.

• Journal of Nutrition and Health
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• v.30 no.2
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• pp.170-176
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• 1997

Twenty two hypertensive and thirty normotensive in-patients were participated in this study to investigate the relationship between plasma renin activity and metabolism of Ca and Na, Prior to pharmacological treatments, renin activity, aldosterone and parathyroid hormone(PTH) levels were measured from the fasting blood samles. Twenty four hour urine samples were collected to analyze urinary levels of creatinine, Ca, Na and K. Habitual intake of Na and Ca were also measured for hypertensive and normotensive patients. Hypertensive subjects were classified into higher reinin hypertensive (HH), medium renin hypertensive(MH) and low renin hypertensive (LH) group according to their renin activities. PTH level of LH group was the highest among three hypertensive groups. It appeared that aldosterone levels of HH group were significantly higher than LH or MH groups(p<0.05). However there were no significan시 differences in aldosterone level between LH group and normotensive group. Habitual intake of Na and Ca were highest in LH group but lowest in HH group, however, they were not statistically different. Positive correlations of systolic blood pressure with PTH(r=0.2597) and aldosterone(r=0.26480existed(p<0.05). Urinary Ca level was positively correlated with urinary Na(r=0.5619), K(r=0.4533) and habitual Na intake(r=0.3253). Above results suggested the possible relationships among renin activity, habitual Ca intake and Na intake and suggested a further study on the interrelationship between the hormonal control of Ca and Na metabolism and blood pressure in hypertension.

• Asian-Australasian Journal of Animal Sciences
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• v.14 no.8
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• pp.1129-1132
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• 2001

Seventy-two Korean native bulls, with an average initial body weight of $247.2{\pm}2.34kg$ were used to determine the effect of different flaked lupin seed inclusion levels (0%, 15% and 30%; Control, LS15, LS30, respectively) on growth with a $3{\times}3$ randomized complete block design at the experimental farm of TS Corporation in Korea for 150 days. There were no significant differences in average daily gain (ADG) and feed:gain among treatments, However, LS30 increased concentrate intake and total feed intake (p<0.05) and decreased rice straw intake compared with Control and LS 15 (p<0.05), With inclusion of flaked lupin seeds, concentrate intake and total feed intake increased (p<0.01) and rice straw intake decreased (p<0.05) compared with Control. There were no specific changes in the health status of animals used in this experiment with inclusion of flaked lupin seeds in concentrates. Inclusion of flaked lupin seeds in the concentrates showed a tendency of reduced average daily total feed cost per kg weight gain compared with Control by 1.6% and 3.4%, respectively, in LS15 and LS30.

• Asian-Australasian Journal of Animal Sciences
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• v.13 no.5
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• pp.625-629
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• 2000

Six yearling Suffolk ewes were used to study the effect of different roughage proportion diets (30%=LR, and 70%=HR) and intake levels (0.7 M and 1.3 M) on heat production and thermoregulatory responses in sheep exposed to different ambient temperatures (20 and $30^{\circ}C$). Sheep fed HR had higher heat production (HP) and time spent eating (TSE) and lower time spent standing (TSS) than those fed LR. But effect of roughage proportion on vaginal temperature (Tv) was obvious only at high intake and at $30^{\circ}C$. Sheep fed high intake had higher Tv, HP, TSS, and TSE than those fed low intake. Roughage proportion and intake level did not have an effect on respiration rate (RR), but ambient temperature did. Ambient temperature did not have an effect on HP, TSS and TSE. At $30^{\circ}C$ sheep had higher Tv and RR than those at $20^{\circ}C$. There were interactions between intake level and ambient temperature in TSS, between intake level and roughage proportion in TSE, and between roughage proportion and ambient temperature in HP. Results indicate that high roughage diet imposes a greater potential heat load on animals than low roughage diet when given at high ambient temperature, but not at low ambient temperature. And the effects is more pronounced at high intake.