• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제34권4호
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• pp.242-249
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• 2023

Objectives: Following the coronavirus disease 2019 (COVID-19) pandemic, adolescents have experienced decreased physical activity and a decline in mental health. This study analyzed the association between changes in depressed mood after the COVID-19 pandemic and physical activity among adolescents. Methods: The analysis was based on the results of the 17th Youth Health Behavior Online Survey conducted in 2021, which included 54848 middle and high school students in South Korea. Information on physical activity included low-intensity physical activity lasting >60 min/day, high-intensity physical activity, and strength training exercises. A logistic regression analysis was performed to evaluate the association between physical activity and changes in depression after the COVID-19 pandemic. Results: After adjusting for sociodemographic characteristics and previous depression, adolescents who performed strength training exercises more than once per week had a 0.95-fold lower risk (odds ratio [OR]=0.948, 95% confidence interval [CI]=0.905-0.994, p=0.027) of increasing depression after the COVID-19 pandemic, while the risk of decreasing depression increased by 1.22-fold (OR=1.215, 95% CI=1.131-1.305, p<0.001). The results were not significant for low-intensity physical activity for >60 min/day and high-intensity physical activity. Conclusion: Strength-training exercises are significantly associated with the prevention of depression among adolescents following the COVID-19 pandemic.

• Safety and Health at Work
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• 제6권1호
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• pp.71-74
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• 2015

Obesity and fitness have been identified as key health concerns among USA firefighters yet little is known about the current habits related to exercise and diet. In particular, high-intensity training (HIT) has gained increasing popularity among this population but limited quantitative data are available about how often it is used and the relationship between HIT and other outcomes. Using survey methodology, the current study evaluated self-reported HIT and diet practice among 625 male firefighters. Almost one-third (32.3%) of participants reported engaging in HIT. Body composition, as measured by waist circumference and percentage body fat, was significantly related to HIT training, with HIT participants being approximately half as likely to be classified as obese using body fat [odds ratio (OR) = 0.52, 95% confidence interval (CI) = 0.34-0.78] or waist circumference (OR = 0.61, 95% CI = 0.37-0.98). Those who engaged in HIT were more than twice as likely as those who did not (OR = 2.24, 95% CI = 1.42-3.55) to meet fitness recommendations. Findings highlight directions for future prevention and intervention efforts.

• Physical Therapy Rehabilitation Science
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• 제12권2호
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• pp.115-122
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• 2023

Objective: A previous study reported that cardiovascular training (CT) decreased interleukin-6 (IL-6), a pro-inflammatory cytokine with bidirectional effects. However, because of conflicting results of increasing and decreasing IL-6 levels in stroke patients, it is essential to clarify the effects of CT on IL-6 levels in this population. Therefore, this review aimed to investigate the effects of CT on IL-6 levels in stroke patients through a meta-analysis of randomized controlled trials (RCTs), synthesizing and analyzing the effects qualitatively and quantitatively. Design: A systematic review and meta-analysis of randomized controlled trials. Methods: In this review, conducted in April 2023, electronic databases (Web of Science, CINAHL, Embase, MEDLINE, Google Scholar) were searched to ascertain the effects of CT on IL-6 levels in stroke patients. For qualitative evaluation, ReVMan, provided by the Cochrane Group, was used, and for quantitative evaluation, a random-effects model and SMD (Standardized Mean Difference) were used. Results: Three RCTs measured IL-6 in 117 patients with stroke. The experimental group to which CT was applied showed no significant change compared to the control group.The result of analysis using the random effect model is SMD=-0.23; 95% confidence interval, -0.66 to 0.20. Conclusions: CT does not affect IL-6 levels in stroke patients. These results suggest that CT can be applied regardless of its positive or negative effect on IL-6 levels in stroke patients.

• 한국화재소방학회논문지
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• 제34권2호
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• pp.97-102
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• 2020

본 연구는 소방공무원 16명을 대상으로 8주간 고강도 인터벌 트레이닝(HIIT) 중 타바타(Tabta) 프로그램을 진행하였으며 자료처리는 윌콕슨 순위검증(Wilcoxon signed rank test)와 대응표본 t검정(Paired t-test)분석을 실시하였다. 체력요인 중 하버드 스텝(Harvard step, 회)은 운동 전 87.19 ± 12.33에서 운동 후 93.81 ± 13.27 (p < .009), 윗몸일으키기(회)는 운동 전 35.75 ± 10.73에서 운동 후 39.00 ± 8.80 (p < .001), 악력(kg)은 운동 전 53.35 ± 6.11에서 운동 후 55.65 ± 6.74 (p < .035)으로 각각 유의한 차이가 나타났다. 신체조성 중 체지방률(%)은 운동 전 17.69 ± 4.32에서 운동 후 15.66 ± 3.33 (p < .003), 근육량(%)은 운동 전 36.65 ± 4.38에서 운동 후 36.41 ± 4.24 (p < .043), 체중(kg)은 운동 전 75.50 ± 6.40에서 운동 후 74.24 ± 6.40 (p < .000)으로 각각 유의한 차이가 나타났다. 37층 도착시간은 운동 전 8 min 13 s ± 1 min 8 s에서 운동 후 7 min 19 s ± 1 min 6 s (p < .002) 유의하게 감소시켰다. 따라서 HIIT는 화재 및 재난상황 대비 업무능력 향상에 긍정적 영향을 미칠 것으로 판단된다.

• 운동영양학회지
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• 제13권2호
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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.

• 생명과학회지
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• 제19권2호
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• pp.271-276
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• 2009

본 연구는 여자대학생에게 복싱에어로빅 운동 후, 그 운동이 심박수변이도에 미치는 영향을 알아보기 위하여 시도되었다. 운동전 측정과 3개월 복싱에어로빅 운동 후 측정, 두 차례에 의하여 검사한 결과 다음과 같은 결론을 얻었다. (1) 심박수변이도의 결과 Mean HRT는 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (2) 심박수변이도의 결과 SDNN은 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (3) 심박수변이도의 결과 RMSSD는 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (4) 심박수변이도의 결과 TP는 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (5) 심박수변이도의 결과 LF는 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (6) 심박수변이도의 결과 HF는 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (7) 심박수변이도의 결과 LF/HF는 집단 및 시간, 집단과 시간간의 교호작용이 유의한 차이가 나타나지 않았다. (8) 심박수변이도의 결과 VLF는 집단 및 시간, 집단과 시 간간의 교호작용이 유의한 차이가 나타나지 않았다. 이상을 종합할 때 심박수변이도는 환경적인 영향을 받는 것으로 생각되어지며, 심박수변이도가 운동에 미치는 영향을 자세하기 규명하기 위해서는 비교적 동일한 집단을 더욱 세분화시키고 연령대와 성별, 운동형태 등에 따른 보다 장기적인 연구가 필요한 것으로 생각된다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제24권1호
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• pp.54-64
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• 2021

Purpose: Nonalcoholic fatty liver disease (NAFLD) is the most frequent cause of chronic liver diseases in both adults and children with obesity. The aim of this study was to compare the changes in liver enzymes and metabolic profile in adolescents with fatty liver following selected school-based exercise (SBE) and high-intensity interval training (HIIT) interventions. Methods: In a semi-experimental study, 34 obese male adolescents with clinically defined NAFLD were divided into the HIIT (n=11, age=12.81±1.02 years, body mass index [BMI]=26.68±2.32 kg/㎡), selected SBE (n=11, age=13.39±0.95 years, BMI=26.47±1.74 kg/㎡), and control (n=12, age=13.14±1.49 years, BMI=26.45±2.21 kg/㎡) groups. The ultrasonography NAFLD grade, peak oxygen uptake (VO2peak), lipid profile, insulin resistance, and alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels of the participants were measured before and after the exercise interventions. Results: The BMI, waist-to-hip ratio, and body fat percentage of the participants decreased, and a significant increase in VO2peak was observed after the intervention; however, the HIIT group showed a significant improvement compared with the SBE group (p<0.01). Significant reductions were observed in the levels of insulin resistance, triglyceride, total cholesterol, ALT, and AST in both groups, although high-density lipoprotein levels decreased only in the HIIT group (p<0.01). Further, a significant reduction in low-density lipoprotein level was observed in the training groups (p<0.01), but this decrease was not significant compared with the control group (p>0.01). Conclusion: HIIT and SBE are equally effective in improving health parameters in obese children and adolescents.

• Advances in nano research
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• 제14권4호
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• pp.355-362
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• 2023

Physical exercise, especially intense exercise and high intensity interval training (HIIT) by trampoline, can lead to muscle injuries. These effects can be reduced with intelligent products made of nanocomposite materials. Most of these nanocomposites are polymers reinforced with silicon dioxide, alumina, and titanium dioxide nanoparticles. This study presents a polymer nanocomposite reinforced with silica. As a result of the rapid reaction between tetraethyl orthosilicate and ammonia in the presence of citric acid and other agents, silica nanostructures were synthesized. By substituting bis (4-amino phenoxy) phenyl-triptycene in N, N-dimethylformamide with potassium carbonate, followed by catalytic reduction with hydrazine and Pd/C, the diamine monomer bis (4-amino phenoxy) phenyl-triptycene is prepared. We synthesized a new polyaromatic (imide) with triptycene unit by sol-gel method from aromatic diamines and dianhydride using pyridine as a condensation reagent in NMP. PI readily dissolves in solvents and forms robust and tough polymer films in situ. The FTIR and NMR techniques were used to determine the effects of SiO₂ on the sol-gel process and the structure of the synthesized nanocomposites. By using a simultaneous thermal analysis (DTA-TG) method, the appropriate thermal operation temperature was also determined. Through SEM analysis, the structure, shape, size, and specific surface area of pores were determined. Analysis of XRD results is used to determine how SiO₂ affects the crystallization of phases and the activation energy of crystallization.