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Jooyoung Kim
Office of Academic Affairs, Konkuk University, 268, Chungwon-daero, Chungju 27478, Korea

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Journal article
Published: 28 June 2021 in International Journal of Environmental Research and Public Health
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Creatine and sodium bicarbonate are both ergogenic aids for athletic performance. However, research on the combined creatine and sodium bicarbonate (CSB) supplementation in soccer is limited. This study investigated the changes in soccer-specific performance in elite soccer players after supplementing with CSB. Twenty well-trained elite soccer players participated in the study (age: 20.70 ± 1.08 years; height: 173.95 ± 2.81 cm; body weight: 70.09 ± 3.96 kg; soccer experience: 8 years; average training hours per week: 20 h). The participants were randomly allocated into CSB groups (CSB, n = 10) and placebo groups (PLA, n = 10). The CSB group took creatine (20 g/day) and sodium bicarbonate (0.3 g/kg/day); these two supplements were taken four times a day (morning, afternoon, evening, and before sleep) for seven days. Soccer-specific performance was assessed via 10- and 30-m sprint, coordination, arrowhead agility, and Yo-Yo intermittent recovery level 1 tests. Compared to the PLA group, the CSB group performed better in the 30-m sprint (CSB: −3.6% vs. PLA: −0.6%, p = 0.007, effect size (ES): 2.3) and both right and left arrowhead agility (right: CSB: −7.3% vs. PLA: −0.7%, p< 0.001, ES: 2.8; left: CSB: −5.5% vs. PLA: −1.2%, p = 0.001, ES: 2.1) tests. However, there were no differences in 10 m sprints, coordination, and Yo-Yo intermittent recovery level 1 tests between the two groups (p > 0.05). In conclusion, CSB supplementation improved sprint and agility in elite soccer players. However, it is still unclear whether such effect is synergistic effect of two supplements or the result of either one of them. Therefore, caution should be taken when interpreting the results, and the limitations should be examined further in future studies.

ACS Style

Jooyoung Kim. Effects of Combined Creatine and Sodium Bicarbonate Supplementation on Soccer-Specific Performance in Elite Soccer Players: A Randomized Controlled Trial. International Journal of Environmental Research and Public Health 2021, 18, 6919 .

AMA Style

Jooyoung Kim. Effects of Combined Creatine and Sodium Bicarbonate Supplementation on Soccer-Specific Performance in Elite Soccer Players: A Randomized Controlled Trial. International Journal of Environmental Research and Public Health. 2021; 18 (13):6919.

Chicago/Turabian Style

Jooyoung Kim. 2021. "Effects of Combined Creatine and Sodium Bicarbonate Supplementation on Soccer-Specific Performance in Elite Soccer Players: A Randomized Controlled Trial." International Journal of Environmental Research and Public Health 18, no. 13: 6919.

Journal article
Published: 30 April 2021 in The Asian Journal of Kinesiology
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OBJECTIVES This study aims to investigate the effects of instrument-assisted soft tissue mobilization (IASTM) on ankle range of motion (ROM) and balance in older women.METHODS The 20 older women with a history of falls participated in the study, and the study subjects were randomly divided into the IASTM group (n=10) and control group (n=10).RESULTS There were no significant interactions between group and time for ankle ROM and functional reach after 8 weeks of IASTM on older women (P>0.05). Meanwhile, there were significant interactions between group and time for one-leg standing and star excursion balance (P<0.05), and in particular, the IASTM group had greater improvements compared to the control group.CONCLUSION In conclusion, the regular application of IASTM has been shown to improve the balance of older women with a history of falls.

ACS Style

Han Wool Lee; Hyoung Jean Beak; Eun-Jung Yoon; Jooyoung Kim. Effect of Instrument-Assisted Soft Tissue Mobilization on Ankle of Range of Motion and Balance in Older Women: A Preliminary Study. The Asian Journal of Kinesiology 2021, 23, 2 -8.

AMA Style

Han Wool Lee, Hyoung Jean Beak, Eun-Jung Yoon, Jooyoung Kim. Effect of Instrument-Assisted Soft Tissue Mobilization on Ankle of Range of Motion and Balance in Older Women: A Preliminary Study. The Asian Journal of Kinesiology. 2021; 23 (2):2-8.

Chicago/Turabian Style

Han Wool Lee; Hyoung Jean Beak; Eun-Jung Yoon; Jooyoung Kim. 2021. "Effect of Instrument-Assisted Soft Tissue Mobilization on Ankle of Range of Motion and Balance in Older Women: A Preliminary Study." The Asian Journal of Kinesiology 23, no. 2: 2-8.

Original article
Published: 12 April 2021 in Journal of Investigative Dermatology
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Licoricidin, the fifth-highest fraction among the isolated 48 molecules from Glycyrrhiza uralensis extracts, has been known as anti-inflammatory bioactive molecules, however, few studies have shown its inhibitory effect on T cell activation and atopic dermatitis. The present study examined the therapeutic potential of licoricidin in atopic dermatitis by modulating T cell activation with molecular mechanism. Licoricidin attenuated the expression of IL-2 mRNA in stimulated T cells without cytotoxicity. Since tyrosine-protein phosphatase non-receptor type 1 (PTPN1) was predicted to interact physically with licoricidin in T cells in silico analysis, the results of PTPN1 activity assay and phosphorylation study predicted that licoricidin might abrogate the activity of PTPN1 during T cell activation. Pre-treatment with licoricidin controlled the dephosphorylation of Lck on T cell receptor (TCR)-mediated stimulation. Moreover, licoricidin alleviated the symptoms of DNCB/mite extract-induced AD, including ear thickness and serum IgE level. Microscopic analysis also showed the effects of licoricidin on the thickness of dermis/epidermis and infiltration of immune cells. Furthermore, mRNA level of pro-inflammatory cytokines were attenuated in the ear lesions of licoricidin-treated AD mice. Therefore, licoricidin has therapeutic potential for treating AD and its underlying mechanism involves effective modulation of T cell activation by controlling PTPN1 to maintain Lck phosphorylation.

ACS Style

Hyun-Su Lee; Jooyoung Kim; Hyun Gyu Choi; Eun-Kyung Kim; Chang-Duk Jun. Licoricidin Abrogates T-Cell Activation by Modulating PTPN1 Activity and Attenuates Atopic Dermatitis In Vivo. Journal of Investigative Dermatology 2021, 1 .

AMA Style

Hyun-Su Lee, Jooyoung Kim, Hyun Gyu Choi, Eun-Kyung Kim, Chang-Duk Jun. Licoricidin Abrogates T-Cell Activation by Modulating PTPN1 Activity and Attenuates Atopic Dermatitis In Vivo. Journal of Investigative Dermatology. 2021; ():1.

Chicago/Turabian Style

Hyun-Su Lee; Jooyoung Kim; Hyun Gyu Choi; Eun-Kyung Kim; Chang-Duk Jun. 2021. "Licoricidin Abrogates T-Cell Activation by Modulating PTPN1 Activity and Attenuates Atopic Dermatitis In Vivo." Journal of Investigative Dermatology , no. : 1.

Journal article
Published: 14 March 2021 in International Journal of Environmental Research and Public Health
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As adolescents spend the majority of their time focused on exams and assignments, they do not have sufficient time to engage in physical activity; this lack of physical activity is an important public health concern. This study aimed to investigate how school-based physical activity programs affect the health-related physical fitness of adolescents in the Republic of Korea. For this study, a total of 120 high school students participated in a school-based physical activity program that included badminton and table tennis for 15 weeks each (35 min/day, three times a week), with a total of 30 weeks for one academic year. The parameters for health-related physical fitness measured muscle strength (handgrip strength), power (standing long jump), cardiorespiratory fitness (shuttle run test), flexibility (sit and reach), body mass index (BMI), and the total score. The results revealed a statistically significant improvement in muscle strength (p < 0.001), power (p < 0.001), cardiorespiratory fitness (p < 0.001), flexibility (p = 0.005), and the overall health-related physical fitness score (p = 0.001). However, students’ BMI showed no significant difference before and after participation (p = 0.825). The results of this study indicated that school-based physical activity programs can have a positive effect on the health-related physical fitness of adolescents.

ACS Style

Eui-Jae Lee; Wi-Young So; Hyun-Su Youn; Jooyoung Kim. Effects of School-Based Physical Activity Programs on Health-Related Physical Fitness of Korean Adolescents: A Preliminary Study. International Journal of Environmental Research and Public Health 2021, 18, 2976 .

AMA Style

Eui-Jae Lee, Wi-Young So, Hyun-Su Youn, Jooyoung Kim. Effects of School-Based Physical Activity Programs on Health-Related Physical Fitness of Korean Adolescents: A Preliminary Study. International Journal of Environmental Research and Public Health. 2021; 18 (6):2976.

Chicago/Turabian Style

Eui-Jae Lee; Wi-Young So; Hyun-Su Youn; Jooyoung Kim. 2021. "Effects of School-Based Physical Activity Programs on Health-Related Physical Fitness of Korean Adolescents: A Preliminary Study." International Journal of Environmental Research and Public Health 18, no. 6: 2976.

Journal article
Published: 07 July 2020 in International Journal of Environmental Research and Public Health
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Myostatin A55T genotype is one of the candidates showing inter-individual variation in skeletal muscle phenotypes. The aim of this study was to investigate the effect of the myostatin A55T genotype on markers of muscle damage after eccentric exercise. Forty-eight young, healthy male college students (age = 24.8 ± 2.2 years, height = 176.7 ± 5.3 cm, weight = 73.7 ± 8.3 kg) were enrolled in this study, and muscle damage was induced through 50 reps of maximal eccentric muscle contraction. As markers of muscle damage, maximal isometric strength (MIS), muscle soreness, creatine kinase (CK), and aspartate transaminase (AST) were measured. Myostatin A55T genotypes were classified into homozygous myostatin A55T allele (AA, n = 34, 72%), heterozygous myostatin A55T allele (AT, n = 13, 26%), and homozygous mutant carriers (TT, n = 1, 2%). After eccentric exercise, the subjects with heterozygous for AT showed markedly quicker MIS recovery compared to the AA group (p = 0.042). However, there were no significant variations in muscle soreness (p = 0.379), CK (p = 0.955), and AST (p = 0.706) among the groups. These results suggest that AT in myostatin A55T genotype may be associated with quicker strength recovery following exercise-induced muscle damage.

ACS Style

Jooyoung Kim; KwangHoon Park; Joohyung Lee. Myostatin A55T Genotype is Associated with Strength Recovery Following Exercise-Induced Muscle Damage. International Journal of Environmental Research and Public Health 2020, 17, 4900 .

AMA Style

Jooyoung Kim, KwangHoon Park, Joohyung Lee. Myostatin A55T Genotype is Associated with Strength Recovery Following Exercise-Induced Muscle Damage. International Journal of Environmental Research and Public Health. 2020; 17 (13):4900.

Chicago/Turabian Style

Jooyoung Kim; KwangHoon Park; Joohyung Lee. 2020. "Myostatin A55T Genotype is Associated with Strength Recovery Following Exercise-Induced Muscle Damage." International Journal of Environmental Research and Public Health 17, no. 13: 4900.

Journal article
Published: 16 May 2020 in International Journal of Environmental Research and Public Health
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This study aimed to investigate the impact of percent body fat (%BF) on muscle damage after high-intensity eccentric exercise. Thirty healthy male undergraduates (mean age: 22.0 ± 2 years, height: 176.9 ± 5 cm, weight: 75.8 ± 11.6 kg) participated in this study, and they were classified according to their %BF into a high %fat group (HFG, ≥20%, n = 15) and a low %fat group (LFG, ≤15%, n = 15). For eccentric exercise, two sets of 25 reps were performed on a modified preacher curl machine using the elbow flexor muscle. Maximal isometric strength, muscle soreness (passive and active), creatine kinase (CK), and myoglobin (Mb) were measured as indices of muscle damage. The data were analyzed with repeated measures ANOVA. The results show that there is a significant group–time interaction for both CK and Mb after eccentric exercise (p = 0.007, p = 0.015, respectively), with a greater increase in the HFG than in the LFG. However, there was no significant group–time interaction for maximal isometric strength and muscle soreness (passive and active) (p > 0.05). These results suggest that %BF is a factor that alters the muscle damage indices CK and Mb, which indicate membrane disruption, after eccentric exercise.

ACS Style

Eun-Jung Yoon; Jooyoung Kim. Effect of Body Fat Percentage on Muscle Damage Induced by High-Intensity Eccentric Exercise. International Journal of Environmental Research and Public Health 2020, 17, 3476 .

AMA Style

Eun-Jung Yoon, Jooyoung Kim. Effect of Body Fat Percentage on Muscle Damage Induced by High-Intensity Eccentric Exercise. International Journal of Environmental Research and Public Health. 2020; 17 (10):3476.

Chicago/Turabian Style

Eun-Jung Yoon; Jooyoung Kim. 2020. "Effect of Body Fat Percentage on Muscle Damage Induced by High-Intensity Eccentric Exercise." International Journal of Environmental Research and Public Health 17, no. 10: 3476.

Journal article
Published: 09 May 2020 in Sustainability
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Body composition can affect a police officer’s physical performance. We analyzed the correlation between body fat percentage (%fat) and physical performance in 326 male Korean police officers (age, 44.2 ± 9.2 years; height, 174.0 ± 4.5 cm; weight, 76.4 ± 8.8 kg) who were classified into two groups according to their %fat: high-fat (HFG, %fat ≥ 25%; n = 135) and low-fat (LFG, %fat < 25%; n = 191). Physical performance tests included a 100-m sprint, push-ups, sit-ups, and a hand-grip strength test. The results showed significant differences in performance between the groups in the 100-m sprint (p = 0.001) and in the sit-up test (p = 0.033), but not for push-ups (p = 0.130) or hand-grip strength (p = 0.255). A significant positive correlation was found between %fat and the 100-m sprint (r = 0.255, p < 0.000), and a negative correlation was found between %fat and push-ups (r = −0.117, p = 0.035) and sit-ups (r = −0.199, p < 0.000). However, there was no significant correlation between %fat and hand-grip strength (r = −0.093, p = 0.095). To improve physical performance, an intervention training program is recommended for reducing %fat, because high levels of %fat in male Korean police officers were associated with low levels of physical performance.

ACS Style

Jooyoung Kim; Wi-Young So; Sangwoon Kim. Association between Body Fat Percentage and Physical Performance in Male Korean Police Officers. Sustainability 2020, 12, 3868 .

AMA Style

Jooyoung Kim, Wi-Young So, Sangwoon Kim. Association between Body Fat Percentage and Physical Performance in Male Korean Police Officers. Sustainability. 2020; 12 (9):3868.

Chicago/Turabian Style

Jooyoung Kim; Wi-Young So; Sangwoon Kim. 2020. "Association between Body Fat Percentage and Physical Performance in Male Korean Police Officers." Sustainability 12, no. 9: 3868.

Journal article
Published: 27 March 2020 in Scientific Reports
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3′-Sialyllactose (3′-SL), a natural prebiotic, maintains immune homeostasis and exerts anti-inflammatory and anti-arthritic effects. Although regulatory T cells (Tregs) prevent excessive inflammation and maintain immune tolerance, the effect of 3′-SL on Treg regulation is unclear. This study aimed to investigate the effect of 3′-SL on Treg responses in atopic dermatitis (AD) pathogenesis. Oral administration of 3′-SL reduced AD-like symptoms such as ear, epidermal, and dermal thickness in repeated topical application of house dust mites (HDM) and 2,4-dinitrochlorobenzene (DNCB). 3′-SL inhibited IgE, IL-1β, IL-6, and TNF-α secretion and markedly downregulated AD-related cytokines including IL-4, IL-5, IL-6, IL-13, IL-17, IFN-γ, TNF-α, and Tslp through regulation of NF-κB in ear tissue. Additionally, in vitro assessment of Treg differentiation revealed that 3′-SL directly induced TGF-β-mediated Treg differentiation. Furthermore, 3′-SL administration also ameliorated sensitization and elicitation of AD pathogenesis by suppressing mast cell infiltration and production of IgE and pro-inflammatory cytokines in mouse serum by mediating the Treg response. Furthermore, Bifidobacterium population was also increased by 3′-SL administration as prebiotics. Our data collectively show that 3′-SL has therapeutic effects against AD progression by inducing Treg differentiation, downregulating AD-related cytokines, and increasing the Bifidobacterium population.

ACS Style

Li-Jung Kang; Eunjeong Oh; Chanmi Cho; Hokeun Kwon; Choong-Gu Lee; Jimin Jeon; Hyemi Lee; Sangil Choi; Seong Jae Han; Jiho Nam; Chi-Une Song; Hyunho Jung; Hye Young Kim; Eun-Jung Park; Eun-Ju Choi; Jooyoung Kim; Seong-Il Eyun; Siyoung Yang. 3′-Sialyllactose prebiotics prevents skin inflammation via regulatory T cell differentiation in atopic dermatitis mouse models. Scientific Reports 2020, 10, 1 -13.

AMA Style

Li-Jung Kang, Eunjeong Oh, Chanmi Cho, Hokeun Kwon, Choong-Gu Lee, Jimin Jeon, Hyemi Lee, Sangil Choi, Seong Jae Han, Jiho Nam, Chi-Une Song, Hyunho Jung, Hye Young Kim, Eun-Jung Park, Eun-Ju Choi, Jooyoung Kim, Seong-Il Eyun, Siyoung Yang. 3′-Sialyllactose prebiotics prevents skin inflammation via regulatory T cell differentiation in atopic dermatitis mouse models. Scientific Reports. 2020; 10 (1):1-13.

Chicago/Turabian Style

Li-Jung Kang; Eunjeong Oh; Chanmi Cho; Hokeun Kwon; Choong-Gu Lee; Jimin Jeon; Hyemi Lee; Sangil Choi; Seong Jae Han; Jiho Nam; Chi-Une Song; Hyunho Jung; Hye Young Kim; Eun-Jung Park; Eun-Ju Choi; Jooyoung Kim; Seong-Il Eyun; Siyoung Yang. 2020. "3′-Sialyllactose prebiotics prevents skin inflammation via regulatory T cell differentiation in atopic dermatitis mouse models." Scientific Reports 10, no. 1: 1-13.

Journal article
Published: 16 January 2020 in International Journal of Environmental Research and Public Health
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The purpose of this study was to analyze changes in the levels of matrix metalloproteinase-9 (MMP-9), tissue inhibitor of metalloproteinase-1 (TIMP-1), and transforming growth factor-β1 (TGF-β1) in response to strength recovery after eccentric exercise in humans. In this study, 16 healthy males participated and were divided into a faster recovery (FR) group (n = 8, >80% of baseline) and a slower recovery (SR) group (n = 8, 0.05). These results suggest that scar tissue formation caused by the pro-fibrotic activity of growth factors such as TGF-β1 is a potential cause of delay in strength recovery after exercise-induced muscle injury.

ACS Style

Jooyoung Kim; Joohyung Lee. Plasma MMP-9, TIMP-1, and TGF-β1 Responses to Exercise-Induced Muscle Injury. International Journal of Environmental Research and Public Health 2020, 17, 566 .

AMA Style

Jooyoung Kim, Joohyung Lee. Plasma MMP-9, TIMP-1, and TGF-β1 Responses to Exercise-Induced Muscle Injury. International Journal of Environmental Research and Public Health. 2020; 17 (2):566.

Chicago/Turabian Style

Jooyoung Kim; Joohyung Lee. 2020. "Plasma MMP-9, TIMP-1, and TGF-β1 Responses to Exercise-Induced Muscle Injury." International Journal of Environmental Research and Public Health 17, no. 2: 566.

Journal article
Published: 01 July 2018 in International Journal of Environmental Research and Public Health
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Purpose: The present study aimed to investigate the effects of body mass index (BMI), which is an obesity index, on the change in the muscle damage index after eccentric exercise. Methods: Forty healthy male university students participated in this study and were classified into normal (BMI 18.5–22.9 kg/m2, n = 20) and high BMI groups (BMI ≥ 25 kg/m2, n = 20). For eccentric exercise, a modified preacher curl machine was used. Participants performed two exercise sets with 25 repetitions in each set. With regard to the muscle damage index, maximum strength, muscle soreness, and the creatine kinase (CK) level were measured. Results: Loss of maximum strength, muscle soreness, and the CK level were higher in the high BMI group than in the normal BMI group (p < 0.05, p < 0.05, and p < 0.01, respectively). Conclusions: In conclusion, BMI is one of the potential factors related to muscle damage after eccentric exercise.

ACS Style

Jooyoung Kim; Wi-Young So. High Body Mass Index Is Associated with the Extent of Muscle Damage after Eccentric Exercise. International Journal of Environmental Research and Public Health 2018, 15, 1378 .

AMA Style

Jooyoung Kim, Wi-Young So. High Body Mass Index Is Associated with the Extent of Muscle Damage after Eccentric Exercise. International Journal of Environmental Research and Public Health. 2018; 15 (7):1378.

Chicago/Turabian Style

Jooyoung Kim; Wi-Young So. 2018. "High Body Mass Index Is Associated with the Extent of Muscle Damage after Eccentric Exercise." International Journal of Environmental Research and Public Health 15, no. 7: 1378.