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한국운동영양학회> JENB (Journal of Exercise Nutrition & Biochemistry)

JENB (Journal of Exercise Nutrition & Biochemistry) update

  • : 한국운동영양학회
  • : 자연과학분야  >  가정
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  • : 2233-6834
  • : 2233-6842
  • : 운동영양학회지(~2011)→jenb (journal of exercise nutrition & biochemistry)(2011~)

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수록범위 : 1권1호(1997)~24권1호(2020) |수록논문 수 : 693
JENB (Journal of Exercise Nutrition & Biochemistry)
24권1호(2020년 03월) 수록논문
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1Differential effects of jump versus running exercise on trabecular bone architecture and strength in rats

저자 : Yong-in Ju , Hak-jin Choi , Kazuhiro Ohnaru , Teruki Sone

발행기관 : 한국운동영양학회 간행물 : JENB (Journal of Exercise Nutrition & Biochemistry) 24권 1호 발행 연도 : 2020 페이지 : pp. 1-8 (8 pages)

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[Purpose] This study compared differences in trabecular bone architecture and strength caused by jump and running exercises in rats.
[Methods] Ten-week-old male Wistar rats (n=45) were randomly assigned to three body weight-matched groups: a sedentary control group (CON, n=15); a treadmill running group (RUN, n=15); and a jump exercise group (JUM, n=15). Treadmill running was performed at 25 m/min without inclination, 1 h/day, 5 days/week for 8 weeks. The jump exercise protocol comprised 10 jumps/day, 5 days/week for 8 weeks, with a jump height of 40 cm. We used microcomputed tomography to assess microarchitecture, mineralization density, and fracture load as predicted by finite element analysis (FEA) at the distal femoral metaphysis.
[Results] Both jump and running exercises produced significantly higher trabecular bone mass, thickness, number, and fracture load compared to the sedentary control group. The jump and running exercises, however, showed different results in terms of the structural characteristics of trabecular bone. Jump exercises enhanced trabecular bone mass by thickening the trabeculae, while running exercises did so by increasing the trabecular number. FEA-estimated fracture load did not differ significantly between the exercise groups.
[Conclusion] This study elucidated the differential effects of jump and running exercise on trabecular bone architecture in rats. The different structural changes in the trabecular bone, however, had no significant impact on trabecular bone strength.

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2Predicting the resting metabolic rate of young and middle-aged healthy Korean adults: A preliminary study

저자 : Hun-young Park , Won-sang Jung , Hyejung Hwang , Sung-woo Kim , Jisu Kim , Kiwon Lim

발행기관 : 한국운동영양학회 간행물 : JENB (Journal of Exercise Nutrition & Biochemistry) 24권 1호 발행 연도 : 2020 페이지 : pp. 9-13 (5 pages)

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[Purpose] This preliminary study aimed to develop a regression model to estimate the resting metabolic rate (RMR) of young and middle-aged Koreans using various easy-to-measure dependent variables.
[Methods] The RMR and the dependent variables for its estimation (e.g. age, height, body mass index, fat-free mass; FFM, fat mass, % body fat, systolic blood pressure, diastolic blood pressure, mean arterial pressure, pulse pressure, and resting heart rate) were measured in 53 young (male n = 18, female n = 16) and middle-aged (male n = 5, female n = 14) healthy adults. Statistical analysis was performed to develop an RMR estimation regression model using the stepwise regression method.
[Results] We confirmed that FFM and age were important variables in both the regression models based on the regression coefficients. Mean explanatory power of RMR1 regression models estimated only by FFM was 66.7% (R2) and 66.0% (adjusted R2), while mean standard errors of estimates (SEE) was 219.85 kcal/ day. Additionally, mean explanatory power of RMR2 regression models developed by FFM and age were 70.0% (R2) and 68.8% (adjusted R2), while the mean SEE was 210.64 kcal/day. There was no significant difference between the measured RMR by the canopy method using a metabolic gas analyzer and the predicted RMR by RMR1 and RMR2 equations.
[Conclusion] This preliminary study developed a regression model to estimate the RMR of young and middle-age healthy Koreans. The regression model was as follows: RMR1 = 24.383 × FFM + 634.310, RMR2 = 23.691 × FFM - 5.745 × age + 852.341.

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3Potential role of phytochemicals in brain plasticity: Focus on polyunsaturated fatty acids

저자 : Jang Soo Yook , Minchul Lee

발행기관 : 한국운동영양학회 간행물 : JENB (Journal of Exercise Nutrition & Biochemistry) 24권 1호 발행 연도 : 2020 페이지 : pp. 14-18 (5 pages)

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[Purpose] Functional foods are thought to strongly influence the structure and function of the brain. Previous studies have reported that brain-boosting diets may enhance neuroprotective functions. Certain foods are particularly rich in nutrients like phytochemicals that are known to support brain plasticity; such foods are commonly referred to as brain foods.
[Methods] In this review, we briefly explore the scientific evidence supporting the neuroprotective activity of a number of phytochemicals with a focus on phenols and polyunsaturated fatty acids such as flavonoid, olive oil, and omega-3 fatty acid.
[Results] The aim of this study was to systematically examine the primary issues related to phytochemicals in the brain. These include (a) the brain-gut-microbiome axis; (b) the effects of phytochemicals on gut microbiome and their potential role in brain plasticity; (c) the role of polyunsaturated fatty acids in brain health; and (d) the effects of nutrition and exercise on brain function.
[Conclusion] This review provides evidence supporting the view that phytochemicals from medicinal plants play a vital role in maintaining brain plasticity by influencing the brain-gut-microbiome axis. The consumption of brain foods may have neuroprotective effects, thus protecting against neurodegenerative disorders and promoting brain health.

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4Hypoxic exposure can improve blood glycemic control in high-fat diet-induced obese mice

저자 : Yeram Park , Inkwon Jang , Hun-young Park , Jisu Kim , Kiwon Lim

발행기관 : 한국운동영양학회 간행물 : JENB (Journal of Exercise Nutrition & Biochemistry) 24권 1호 발행 연도 : 2020 페이지 : pp. 19-23 (5 pages)

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[Purpose] Blood glucose and insulin resistance were lower following hypoxic exposure in previous studies. However, the effect of hypoxia as therapy in obese model has not been unknown. [Methods] Six-week-old mice were randomly divided into chow diet (n=10) and high-fat diet (HFD) groups (n=20). The chow diet group received a non-purified commercial diet (65 % carbohydrate, 21 % protein, and 14 % fat) and water ad libitum. The HFD group was fed an HFD (Research Diet, #D12492; 60% kcal from fat, 5.24 kcal/g). Both groups consumed their respective diet for 7 weeks. Subsequently, HFD-induced mice (12-weeks-old) were randomly divided into two treatment groups : HFD-Normoxia (HFD; n=10) and HFD-Hypoxia (HYP; n=10, fraction of inspired=14.6%). After treatment for 4 weeks, serum glucose, insulin and oral glucose tolerance tests (OGTT) were performed. [Results] Homeostatic model assessment values for insulin resistance (HOMA-IR) of the HYP group tended to be lower than the HFD group. Regarding the OGTT, the area under the curve was 13% lower for the HYP group than the HFD group. [Conclusion] Insulin resistance tended to be lower and glucose uptake capacity was significantly augmented under hypoxia. From a clinical perspective, exposure to hypoxia may be a practical method of treating obesity.

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[Purpose] Recent studies have demonstrated a probable association between ACE I/D polymorphism and obesity. Thus, this study aimed to investigate whether ACE I/D polymorphism influenced the susceptibly of developing obesity in Korean adults.
[Methods] A total of 353 healthy Korean adults aged between 30 and 82 years were recruited, including 157 males and 196 females. Among the participants, 103 (29.2 %) were classified as normal (BMI < 23 kg/m2), 117 (33.1 %) as overweight (23 kg/m2 ≤ BMI < 25 kg/ m2), and 133 (37.7 %) as obese (BMI ≥ 25 kg/m2). ACE polymorphism (rs1799752) analysis was performed using the MGB TaqMan® SNP Genotyping assay with 3 types of primers and 2 types of probes. The distributions of the ACE genotypes and allele frequencies were analyzed among the three groups using the Hardy- Weinberg equilibrium, chi-square tests, and multiple regression analysis.
[Results] The distribution of the ACE genotypes were as follows: normal [II: n=38 (36.9 %), ID: n=46 (36.8 %), DD: n=19 (18.4 %)], overweight [II: n=43 (36.8 %), ID: n=55 (47.0 %), DD: n=19 (16.2 %)], and obese [II: n=41 (30.8 %), ID: n=76 (57.0 %), DD: n=16 (12.0 %)]. Unexpectedly, the I allele, rather than the D allele, was common in the obese group.
[Conclusion] ACE I/D polymorphism is not associated with BMI in Korean adults. Thus, it is unlikely to be a powerful candidate gene for obesity in Korean adults.

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6The effect of short-term creatine intake on blood lactic acid and muscle fatigue measured by accelerometer-based tremor response to acute resistance exercise

저자 : Sinwook Lee , Gyuseog Hong , Wonil Park , Jaeseong Lee , Nahyun Kim , Hyejoon Park , Jonghoon Park

발행기관 : 한국운동영양학회 간행물 : JENB (Journal of Exercise Nutrition & Biochemistry) 24권 1호 발행 연도 : 2020 페이지 : pp. 29-36 (8 pages)

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[Purpose] The purpose of this study was to investigate the effects of short-term creatine intake on muscle fatigue induced by resistance exercise in healthy adolescent men, i.e., lactic acid concentration and wrist and head tremor measured by an accelerometer.
[Methods] Twelve healthy adolescent men who had no experience with creatine intake were included. The subjects were randomly assigned to the creatine group and the placebo group, followed by 5 days of creatine and placebo intake, and 5 times of 5 sets of leg press, leg extension, bench press, and arm curl exercises at 70% repetition maximum (RM). The lactic acid concentration before and after exercising, rate of perceived exertion (RPE), and accelerometer-based wrist tremor and head tremor during exercise were measured. Subsequently, after 7 days to allow for creatine washout, the same exercise treatment and measurement were performed in each group after switching drug and placebo between the groups.
[Results] The level of lactic acid before and after the acute resistance exercise trial was significantly lower in the creatine group than in the placebo group (P <0.05). The mean RPE during the resistance exercise was significantly lower in the creatine group than in the placebo group (P <0.05). There was no difference between the two groups in the mean wrist tremor during resistance exercise, but the mean head tremor values were significantly lower in the creatine group than in the placebo group in the arm curl, the last event of the exercise trials (P <0.05).
[Conclusion] Short-term creatine intake reduces the blood fatigue factor increased by resistance exercise, and is thought to suppress fatigue, especially in the latter half of resistance exercise. Therefore, these findings indicate that short-term creatine intake can have an improved effect on anaerobic exercise performance.

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[Purpose] The purpose of this study was to examine the effects of elastic band exercises and nutritional education, as well as to identify the factors influencing frailty, strength, and nutritional intake of elderly women.
[Methods] The subjects in this study were 30 elderly women who were divided into four groups. All groups agreed to participate in four programs: health educatoin only (HE), elastic band exercises only (EX), nutritional education only (NU), and elastic band exercises plus nutritional education (EX+NU). Frailty was evaluated by measuring the frailty factors according to Fried et al. Leg strength was measured using a leg-extension machine. Nutritional intake was assessed by the 24-hour recall method and food records. Nutritional intake was analyzed by CAN Pro 5.0 program.
[Results] After three months, the prevalence of frailty significantly decreased in the EX+NU group (P=0.013) compared with that of the HE group (P=0.088). There was significant improvement in leg strength in both the EX (P=0.012) and EX+NU groups (P=0.003) compared with that of the HE group (EX, P=0.005; EX+NU, P=0.002). The nutritional intake significantly decreased in the EX group compared with that of the HE group (P<0.05, P<0.05).
[Conclusion] The combination of elastic exercises and nutrition education had positive effects on frailty and leg strength, while having negative effects on total calories, carbohydrate, sodium, and iron intake in elderly women. Elastic exercises only had positive effects on leg strength while having negative effects on nutritional intake in elderly women.

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