• Journal of Nutrition and Health
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• v.43 no.4
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• pp.395-403
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• 2010

This study was conducted to examine the dietary behaviors with 510 high school students (260 males and 250 females) residing in Seoul. The average age of male and female students were 16.3 and 16.4 years old, respectively. Mean height and weight of male students were 174.1 cm and 65.9 kg and those of female students were 161.6 cm and 52.5 kg. The body mass index (BMI) of male and female students were $21.7\;kg/m^2$ and $20.1\;kg/m^2$, respectively, which were within the normal range. Students skipped breakfast more than once a week were 41.1% of males and 44.4% of females. More than 40% of the male and female students skipped breakfast frequently. The mean mini dietary assessment index score of male and female students were 30.6 and 29.6 out of total 50 index scores, respectively. Female students perceived significantly less healthy and fatter than male students. Furthermore, body image satisfaction of the female students was lower than that of male students. Female students were more significantly concerned with body image and desired a thin body shape. Only 22.7% of male students and 6.4% of female students exercised regularly, and the frequency, time, and intensity of exercise in the male students were significantly higher than those of female students.

• Korean Journal of Exercise Nutrition
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• v.25 no.2
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• pp.20-25
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• 2021

[Purpose] The aim of this review was to discuss the effects of vitamin D on physical performance and musculoskeletal injuries in athletes and provide information on the field applications of vitamin D. [Methods] A systematic review was conducted to identify studies on vitamin D in athletes that assessed serum vitamin D levels, vitamin D and physical performance, vitamin D and musculoskeletal injuries, and practical guidelines for supplementation of vitamin D. [Results] Several studies reported that a high proportion of athletes had vitamin D insufficiency or deficiency. Low serum levels of vitamin D in athletes were more pronounced in winter than in other seasons, and indoor athletes had lower serum vitamin D levels than outdoor athletes. Low vitamin D levels have been demonstrated to have negative effects on muscle strength, power, and endurance; increase stress fractures and other musculoskeletal injuries; and affect acute muscle injuries and inflammation following high-intensity exercises. Therefore, periodic assessment and monitoring of vitamin D levels are necessary in athletes; the recommended serum level of 25(OH)D is > 32 ng/mL and the preferred level is > 40 ng/mL (-1). In those with low levels of vitamin D, exposure to sunlight and an improved diet or supplements may be helpful. Particularly, 2000-6000 IU of supplemental vitamin D3 can be consumed daily. [Conclusion] Vitamin D is a potential nutritional factor that can significantly affect physical performance and musculoskeletal injuries in athletes. The importance and role of vitamin D in athletes should be emphasized, and the current levels of vitamin D should be assessed. Therefore, it is essential to periodically evaluate and monitor serum vitamin D levels in athletes.

• Journal of Korean Biological Nursing Science
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• v.25 no.3
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• pp.160-171
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• 2023

Purpose: To identify factors influencing health-related quality of life for young single-person households, this study investigated physical and mental health status, health behavior, depression, resilience, and health-related quality of life. Methods: An online survey was administered to members of young single-person households from March 22 to 30, 2022. The data were analyzed using the chi-square test, independent t-test, one-way analysis of variance, Pearson correlation coefficients, multiple regression, and a simple mediation model applying the PROCESS macro model 4 with 95% bias-corrected bootstrapped confidence intervals. Results: The participants were 229 members of young single-person households. Health-related quality of life showed significant relationships with residence (t = 2.80, p = .006), month (F = 3.70, p = .026), mental health status (F = 20.33, p < . 001), and high-intensity exercise (F = 7.35, p = .001) among general and health-related characteristics. Health-related quality of life had significant correlations with depression (r = -.72, p < .001) and resilience (r = .58, p < .001). Multiple regression analysis showed that depression (β = -.57, p < .001) and resilience (β = .21, p < .001) influenced health-related quality of life. Moreover, resilience had a mediating effect between depression and health-related quality of life (indirect effect = -0.002, 95% bias-corrected bootstrapped confidence interval = -0.003 to -0.001). Conclusion: Members of young single-person households tended to be more vulnerable to emergency situations, such as during the coronavirus disease 2019 pandemic, when lockdowns and quarantines were frequent. To improve health-related quality of life in young single-person households, people with high levels of depression or low levels of resilience need special attention and support to promote mental health.

• Korean Journal of Exercise Nutrition
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• v.13 no.2
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• pp.123-130
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• 2009

The purpose of this study was to provide the basic information on nutritional condition for improving performance of the national junior rowing team players(male n=17, female n=14). To attain this purpose, their body composition and energy intake situations were investigated during their three-week winter training camp. Measurement of body composition measured by the interval, and two days, and dietary intake in this study to investigate the type and amount of food, the researchers measured directly, and then refer to the record subjects to investigate the dietary intake and the adoption of a Weighing Method. The result is as follows. During training, body composition due to the high intensity training to maintain a properly balanced diet is the consumption of energy, weight and body composition has a positive influence. The male players' average energy intake is 5,951.6 kcal(72.6 kcal/kgBW, 150%), the rate of the three main nutrients, carbohydrate, fat, protein, is 72.6 : 8.7 : 18.7 respectively. For the female, the average energy intake is 3,685.6 kcal(51.8 kcal/kgBW, 121%), and the rate of the three main nutrients is 76.3 : 8.5 : 15.2. Both of male and female were taken sufficient Vitamin, mineral and other nutrient according to %RI(recommended intake). Based on the results of a survey of elite athletes and nutrition management and the systematic introduction and review of the program in conjunction with a professional nutritionist would need, and can also be applied to expand the school to the scene, the reality of the program review and development of qualified need.

• Journal of the Korean Applied Science and Technology
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• v.40 no.4
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• pp.761-772
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• 2023

The purpose of this study is to help a recovery of fatigue through the effect of cold immersion treatment after rowing ergometer on blood fatigue substance, MDA and SOD in rowing athletes. For this, 10 subjects participated in this study and we divided them into cold water immersion group (CWI, n=10), non-cold immersion group (NCI, n=10). The exercise program was performed to 2000 m rowing ergometer for maintaining high intensity. The data was collected with regard to the interaction effect of the group and time among the CWI and NCI, ANOVA was used. As the post-hoc test, Bonferroni test was used. The significance was set at .05 and the following conclusions were deduced. For lactic acid, there were the main effect of time (p<.001) and significant difference in the both group (p<.001). Also, LDH were significant difference in the each group (p<.05). For MDA, there were the interaction between group and time (p<.05) and the main effect of group (p<.05) and time (p<.001). SOD were indicated main effect of group and time (p<.05), there was significant difference between each group in the after 30 min recovery (p<.05). Collectively, The results of this study suggest that positive effect on blood fatigue substances, reactive oxygen species and anti-oxidation enzyme through cold water immersion intervention. Therefore, we strongly recommend that performing the cold immersion intervention would be beneficial after high intervention exercise.

• Korean Journal of Health Education and Promotion
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• v.23 no.5
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• pp.1-11
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• 2006

Objectives: The 2003 WHO/FAO technical report described that Korea has largely maintained its traditional high-vegetable diet despite major social and economic changes, and had lower than expected levels of obesity prevalence than other industrialized countries. However, the prevalence of obesity in Korea has recently been rapidly increasing. The aim of this study was to elucidate the determinants of this rapid growth of obesity prevalence in Korea and to compare the results of national nutrition surveys between Korea and Japan. Methods: The trends of the National Health and Nutrition Survey in Korea instituted every 3 years and that in Japan conducted every year were compared. The results of obesity prevalence defined as more than 25 of the Body Mass Index, the percentage of habitual exercisers and the results of the nutritional surveys were examined from 1992 to 2005 in Korea and from 1992 to 2004 in Japan. Results: The prevalence of obesity in males has been gradually increasing in both Korea and Japan since 1992. Though until 1995 the prevalence of obesity in the Korean male population was less than that in Japan, after 1998 Korea surpassed Japan and a markedly increasing trend was observed. In females, the increasing trend of obesity was slower than males in both Korea and Japan. However, the prevalence of obesity was much higher in Korea compared with that in Japan. The percentage of exercisers was much lower in Korea than in Japan. Although, the definition of an exerciser varies with the survey year in Korea and is different from that in Japan, almost 70% of the population was not regularly engaging in moderate or hard intensity exercise in Korea. From 1995, the total energy intake was increased by 9.8% in Korea but it was decreased by 6.9% in Japan. Presently, the energy intake per capita per day in Korea exceeded that in Japan. Remarkable increases in the intake of meat and poultry, vegetable oils and fats, and milk and dairy products were observed in Korea from 1995 to 2005. On the other hand, these values decreased during the same period in Japan. Conclusion: The prevalence of obesity in Korea is increasing and has surpassed that of Japan. The current trends could be attributed to the low prevalence of habitual exercisers, and an increase in energy intake and the proportion of energy intake from fat.

• 한국노년학
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• v.29 no.4
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• pp.1397-1411
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• 2009

This study was aimed to examine the effects of intermittent walking on health related fitness and metabolic syndrome risk factors in elderly women. Forty five elderly women were randomly assigned to three groups: three 10-min walks per day, one 30-min walk per day or no exercise, respectively. Both walking groups exercised three days a week at moderate intensity for 12 weeks. Two-way repeated measures ANOVA was used to test the hypothesis with a significant level of α = .05. The results indicated that body composition(body weight, body mass index, percent body fat), muscle endurance, flexibility and cardiorespiratory fitness significantly increased after 12 weeks for both walking groups. However, it was found that muscle strength significantly increased only in a continuous walking group. Metabolic syndrome risk factors comprised of waist circumference, systolic blood pressure, triglyceride, high-density lipoprotein, and fasting glucose were significantly improved in both walking groups. In addition, there was a difference in these metabolic syndrome risk factors between pre and post exercise. The results of this study support the hypothesis that intermittent walking has a significant impact on health related physical fitness and metabolic syndrome rick factors in elderly women as continuous walking does.

• Journal of the Korea Convergence Society
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• v.7 no.6
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• pp.267-274
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• 2016

This study is planned to investigate the change in blood limpid and oxygen-carrying factors of middle-aged women through 12 weeks of circuit weight training. The participants worked out three times a week for 50 minutes each, with 50-80% of 1RM intensity. As such, the purpose of the study and the procedure brought about the following conclusions. First, the query results of blood limpid showed that the total amount of cholesterol, triglycerides in the blood, and low-density lipoprotein cholesterol decreased significantly, and the amount of high density lipoprotein cholesterol did not show an increase. Second, the results of oxygen-carrying factors showed that the number of oxygen-carrying red blood cells, hemoglobin, and hematocrit showed an increase. Therefore, this circuit weight training program which used weights of the geological landscape is considered as an effective way to exercise, since it had a positive impact on the oxygen-carrying capacity and cardiovascular disease prevention

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.371-376
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• 2018

The purpose of this study is to clarify the effects of whole-body vibration and to provide scientific basis for effective exercise by analyzing the differences in lower extremity muscle activation according to squat position during whole body vibration. In this study, muscle activation during whole-body vibration was measured in 10 healthy males in their 20s with no orthopedic conditions during standing posture, deep squat, half squat, and heel raise squat. Muscle activation was compared by measuring the root mean square (RMS) with electromyography electrodes attached to lateral gastrocnemius, tibialis anterior, vastus lateralis, and biceps femoris. The vibration intensity was applied in combinations of the volumes of 50 and 80 and the frequencies of 10, 25, and 40 Hz in each posture. The results showed that there were differences in muscle activations of external gastrocnemius, tibialis anterior, and vastus lateralis among the position(p<.05). The heal raise squat was found to have a high muscle activation effect.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.383-384
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• 2013

본 연구는 스포츠용 탄력 압박 스타킹(Essential compression calf sleeve, SKINS, Australia)을 착용하고 최대 운동을 하였을 때, 하지 부종에 어떠한 효과가 있는지를 알아보고자 한다. 실험 대상자는 젊은 성인 남녀 30명으로(남자 15명, 여자15명) 근 골격계 및 심혈관계에 특이 병력이나 사고에 의한 외상 등이 없었으며, 규칙적으로 운동을 하는 자는 제외하였다. 대상자들의 신체적 특성을 파악하기 위해서 자동 신장계(BSM330, Biospace, Korea)를 사용하였다. 부종정도를 알기위해서 줄자로 운동 전후의 장딴지 근(종아리)의 둘레와 체성분 분석기(InBody 720, Biospace, Korea)를 사용하여 하지의 부종 수치를 측정하였다. 최대의 운동은 호흡가스 분석기와 연결된 트레이드밀(CPEX-1, IRS, Japan)을 사용하여 변형된 BRUCE Protocol TR-3에 따라 호흡 교환율(R) 값이 1.15이상 되거나 all-out 될 때까지 하였다. 실험 대상자들은 동일 집단으로 전이효과를 방지하기 위하여 일주일의 간격을 두고 스포츠 탄력 압박 스타킹 착용 유무에 따른 동일한 실험을 두 번 하였다. 측정은 최대 운동 전후의 장딴지 근(종아리)의 둘레와 부종 수치를 하였다. 스포츠용 탄력 압박 스타킹 착용 유무와 운동 전후를 비교하기 위하여 MANOVA(다변량 분산분석)를 사용하였고 유의수준은 .05로 설정하였다. 탄력 압박 스타킹을 착용한 상태에서 최대 운동 전후의 부종 정도를 측정한 결과 스타킹을 착용하지 않았을 때 운동 전후의 둘레가 유의하게 증가하였고(p<0.05), 스타킹을 착용 하였을 때 운동 전후의 둘레가 유의하게 증가하지 않았다(p>0.05). 부종 수치(세포외액/전체체액)는 탄력 압박 스타킹을 착용하였을 때 오른쪽 다리는 유의하지 않게 감소하였고(p>0.05), 왼쪽 다리는 유의하게 감소하였다(p>0.05). 탄력 압박 스타킹을 착용하고 운동할 경우 하지의 부종 경감에 어느 정도 효과가 있다고 사료된다.