• Journal of Digital Convergence
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• v.12 no.2
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• pp.353-361
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• 2014

This study was conducted in order to identify the present condition of caffeinated drinks intake including energy drink. Concretely, It was investigated about stress degree, study attitude, sleeping hours by intake degree of caffeinated drinks. Descriptive survey research was designed. A total of 371 students in M university was participated. Data were collected through a questionnaire (from October 22, 2012. to October 26, 2012). The data were analyzed by t-test, ANOVA, scheffe's test, using the SPSS version 17.0. There were no significant differences between caffeinated drinks intake's degree including energy drink. Most of students thought caffeinated drinks intake have an effect on their health. Intake time of caffeinated drinks was before or after studying or sleepy. Caffeinated drinks intaked mostly alone. Intake causes of canned coffee or energy drink was sleepy and coffee mix, black coffee, coffee flavored milk and green tea was good taste. Stress degree, study attitude, sleeping hours by intake degree of caffeinated drinks were no significant effects between canned coffee, coffee mix, black coffee, green tea and energy drink. But, stress degree by intake degree of coffee flavored milk was significant low when it intakes more than once a day, sleeping hours was significant long when it was nondrinking.

• YAKHAK HOEJI
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• v.58 no.6
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• pp.387-396
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• 2014

High Caffeinated Energy Drink (HCED) consumption among adolescents has been exponentially increasing. The intake of HCED may cause various side effects. However, studies regarding intake of HCED in adolescents have been rarely implemented in Korea. The purpose of this study was to investigate HCED consumption patterns among adolescents and prevalence of adverse effects from HCED consumption and to compare them between middle and high school students. The self-reported questionnaire with 31 questions was used to evaluate HCED consumption patterns and adverse effects. Among 792 students, 455 who had drunken HCED were included in the analysis. Nine (4.0%) Middle School Students (MSSs) and 11 (4.8%) High School Students (HSSs) responded that they did not know HCED, and 188 (83.6%) MSSs and 221 (96.1%) HSSs had heard that HCED contains high amount of caffeine. Seventy-four (36.8%) MSSs drank their first HCEDs from curiosity and 63 (31.3%) MSSs to stay awake while studying. However, 134 (61.2%) HSSs consumed their first HCEDs to keep awake while studying, and 57 (26.0%) HSSs from curiosity. Twenty-eight (12.5%) MSSs and 46 (20.3%) HSSs had increase in heart rate, 52 (23.2%) MSSs and 83 (36.4%) HSSs insomnia, and 8 (3.6%) MSSs and 18 (7.9%) HSSs hand and facial tremor. As shown in this study, HCED consumption among adolescents in Korea was high. Thus, Korean government should continuously focus its efforts to educate not only children and adolescents but also their parents for HCEDs in order to increase parents' awareness of HCEDs and conduct education regarding HCED intake at home above all.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.30 no.4
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• pp.153-160
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• 2019

Objectives: This study aimed to evaluate the addiction to highly caffeinated drinks among university students, and we investigated the relationships between smartphone addiction, depression, anxiety, attention-deficit/hyperactivity disorder (ADHD), burnout, self-esteem, impulsiveness in high caffeine drink addiction risk group (high caffeine group). We also compared these mental health factors differences between the high caffeine group and the control group; and, investigated the relative risk between the independent variables of the high caffeine group. Methods: This study was conducted in Korea, from June 2015 to July 2016. A set of questionnaires was administered on 511 college students. Results: The participants who belonged to the high caffeine group were more likely to demonstrate the symptoms of ADHD and higher levels of burnout and impulsiveness. Further, the results of logistic regression analysis confirmed the association between the high caffeine group and burnout. Conclusion: These behaviors among university students addicted to highly caffeinated drinks suggests the need for timely and effective interventions for those at risk of addiction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.8
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• pp.111-121
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• 2019

This study investigated the status of drinking highly caffeinated beverages by Korean adolescents, and we identified the factors influencing this behavior by Korean adolescents by using statistics from the 13th (2017) Survey on Youth Health Behavior Online Survey. The data was collected from 62,276 middle and high school students and the variables of this study included demographic factors, health behavioral factors, mental health factors and the availability of highly caffeinated beverages. The methods of data analysis included descriptive statistics, Chi-square tests and logistic regression analysis. This study found that the intake rate of highly caffeinated beverages was 1.9% for men and 1.5% for women, and these percentages increased with age (p<0.001). Current smoking and drinking, current drug usage and active people also had high intake of caffeinated beverages (p<0.001). A high level of stress, a low level of subjective sleep satisfaction and a feeling of happiness increased the rate of consuming highly caffeinated beverages. The factors of drinking highly caffeinated beverages were gender, age, smoking, physical activity, drug use, stress level, depression and suicidal ideation. Therefore, continuous discussion is needed to improve both the health behavior and mental health by managing the stress felt by Korean adolescents.

• Journal of the Korean Society of School Health
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• v.29 no.2
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• pp.71-80
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• 2016

Purpose: The purpose of this study is to examine the association between consuming high-caffeine energy drinks and suicidal ideation in Korean adolescents. Methods: This study used data drawn from the 2015 Korea Youth Risk Behavior Web_Based Survey. The data of 66,068 students in total (33,374 middle school students and 32,694 high school students) were included in the analysis. The $x^2$ test, univariate and multivariate logistic regressions were conducted with the use of SAS 9.3. Results: Adjusted for the variables associated with suicidal ideation, multivariate logistic regression revealed that consuming highly caffeinated energy drinks had a significant effect on suicidal ideation (middle school students, 1~2 times per week: OR=1.24, 3~4 times per week: OR=1.88, 5~6 times per week: OR=2.20, everyday: OR=2.66, high school students, 1~2 times per week: OR=1.26, 3~4 times per week: OR=1.84, 5~6 times per week: OR=2.42, everyday: OR=3.89). Conclusion: This study strongly suggests adolescents be provided with health education and information about consuming an adequate amount of high-caffeine energy drink and the drink's side effects. In addition, regulations and polices on high-caffeine drink intake should be implemented.

• Journal of the Korean Society of Food Science and Nutrition
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• v.38 no.6
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• pp.709-720
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• 2009

This study was conducted to identify daily caffeine intakes in beverages for elementary school children and to evaluate its effectiveness after nutrition education. The caffeine contents of 140 commercial beverages were analysed by high performance liquid chromatography-ultraviolet detector (HPLC-UV) and information about their consumption were obtained by surveying 267 children. Researchers gave nutrition education to the children, who were 6 to 11 years old and attended 9 classes of 3 elementary schools, by lecture, Powerpoint file and moving picture. Their preference and intake amount on beverages were investigated by questionnaire before and after nutrition education. The order on caffeine contents was coffee ($33.8{\pm}2.4{\sim}49.1{\pm}5.6\;mg/100\;mL$)> coffee milk ($10.6{\pm}3.3\;mg/100\;mL$)> cola ($6.0{\pm}2.4\;mg/100\;mL$)> green black oolong tea drink ($6.0{\pm}2.4\;mg/100\;mL$)> chocolate milk and chocolate drink ($1.6{\pm}0.7{\sim}1.7\;mg/100\;mL$)> black ice tea mix ($1.3{\pm}1.7\;mg/100\;mL$). The order on children's preference was carbonated drink and fruit and vegetable drink (27%)> sports drink (26%)> processed cocoa mix (7%)> milk (6%)> vitamin & functional drink (3%)> green tea drink (2%)> black tea drink and coffee (1%). The average daily caffeine intakes except tea drink was $5.9{\pm}11.2$ mg/person/day ($0.17{\pm}0.32$ mg/kg bw/day), ranged from $0.0{\sim}80.5$ mg/person/day for children. The sources of caffeine were coffee 57% (3.4 mg/person/day), coffee milk 20% (1.2 mg/person/day), carbonated drink 15% (0.9 mg/person/day), chocolate milk and chocolate drink 6% (0.4 mg/person/day), and vitamin & functional drink 2% (0.1 mg/person/day). After nutrition education, the preference of carbonated drink, coffee, vitamin drinks & functional drink was decreased significantly (p<0.05, p<0.05, p<0.01) and the intakes of carbonated drink, chocolate milk & chocolate drink, and vitamin & functional drink were also decreased significantly (p<0.01, p<0.05, p<0.01). This study has shown that nutrition education influences the preference and the intake behavior of caffeinated beverages.

• Journal of Digital Convergence
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• v.15 no.5
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• pp.305-315
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• 2017

This study examined the relationships sleep habits, daytime sleepiness, and problem behaviors. A cross-sectional survey design was used. Participants were 276 adolescents. Sleep habits, daytime sleepiness and problem behavior were measured by Adolescent Sleep Hygiene Scale (ASHS), Epworth Sleepiness Scale (ESS), and Korea-Youth Self Report (K-YSR), respectively. Data were collected from July to August, 2014 using self-reported questionnaires. Participants were middle school students, perceived their sleep time as enough and their sleep quality as good, have no problem behavior during sleep, and have no caffeinated drink for last a week were more likely to have higher score of sleep hygiene. Sleep habits score was associated negatively with daytime sleepiness and problem behaviors. Sleep impacts on physical growth, behavior, and emotional development of adolescent. Therefore, it is necessary to develop a sleep enhancement program for the good sleep habits of the adolescents, and to make efforts at home and school.

• Sleep Medicine and Psychophysiology
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• v.22 no.2
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• pp.57-63
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• 2015

Background and Objectives: Internet addiction is an increasing problem in Korea. The previous studies in this area have targeted adolescents and young adults. This study was conducted to examine the risk of internet addiction in Korean adults and the effect of internet addiction on circadian rhythm. Materials and Methods: For this study, 508 subjects were chosen through population proportional sampling to represent the adult population in Korea, 325 of whom were included based on the Alcohol Use Disorder Identification Test-Korea (Audit-K), Zung's Self-Rating Depression Scale (SDS), drug use in the past year, and suicide attempts. In these subjects, sociodemographic factors including age, gender, and residential area were analyzed, and Young's Internet Addiction Scale (IAS), Morningness-Eveningness Questionnaire (MEQ), and an online survey examining sleep onset time on weekdays and weekends, wake-up time, and caffeinated drink intake were executed. Results: Of the 325 subjects, 136 (41.8%) belonged to a high-risk internet addiction group ($IAS{\geq}40$), and 189 (58.2%) belonged to a normal group (IAS < 40). There was a high proportion of male subjects (p = 0.03) in the high-risk group compared to the normal group. There was a high proportion of younger subjects (p = 0.055) in the high-risk group compared to the normal group, but this difference was not statistically significant. Compared to the normal group, there was a high proportion of the evening type ($MEQ{\leq}41$) in the high-risk group (p = 0.024), who also showed a high proportion of caffeinated drink intake (p < 0.001). Also, the high-risk group was found to go to bed and wake up late, but there was no statistically significant difference with the normal group. Conclusion: This study showed that many adults have a high-risk of internet addiction, and there was a significant correlation between internet addiction and sleep in adult, as has been found in adolescents and early adults. In the future, a longitudinal study will be needed to verify the causal relationship between internet addiction and morningness-eveningness.

• Korean Journal of Food Science and Technology
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• v.52 no.3
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• pp.237-243
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• 2020

Coffee is one of the most widely consumed beverages in the world, and sword bean (Canavalia gladiata, SB) reportedly possesses various biological activities. Therefore, in this study, to reduce caffeine intake and improve coffee function, SB was selected as a supplementary material for blending coffee. The antioxidant and anti-inflammatory activities of coffee with the SB extract at concentrations of 0.1-0.5% (v/v) were evaluated using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and RAW 264.7 cells, respectively. The DPPH radical-scavenging activity of SB-treated coffee depended on the concentration of the SB extract. In the cell culture experiment, cytotoxicity was not observed at any SB concentration. In addition, the inducible nitric oxide synthesis protein expression as well as the increases in nitric oxide and interleukin-6 expression were effectively inhibited by SB addition to the coffee. These results indicate that SB might be useful as a supplementary ingredient to enhance the caffeinated drink functions.

• Journal of Industrial Convergence
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• v.21 no.10
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• pp.29-35
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• 2023

This study aims to find out how the nutrition and eating habit education that Korean adolescents receive at school actually affects and affects their dietary culture. he subject and method of this study was a secondary analysis study using the data from the 18th Korea Youth Risk Behavior Survey(2022). Statistical significance was confirmed using the SPSS program as the frequency of breakfast, reason for skipping breakfast, fruit, high-caffeinated beverage, sweet beverage, fast food, vegetable, milk, water, and late-night snack intake frequency as variables. There was a significant difference in breakfast, fast food, and late-night snacks between the group that received nutrition and eating habits education at school and the group that did not(p<.001). Regarding breakfast consumption, the group that received education showed a higher proportion of students eating breakfast for seven days or more, whereas the group that did not receive education showed a higher proportion of students who did not eat breakfast at all. The group that did not receive education showed a higher proportion of students who did not drink milk, and a higher proportion of students who drank less than one cup of water per day. This study can serve as a foundation for further studies to improve nutritional and dietary education, breakfast consumption, and beverage intake in schools. It was hoped that this study will contribute to developing more effective nutritional and dietary education strategies in schools.