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  • 1
    Online Resource
    Online Resource
    Let’s Live Healthier: The Relationship between Suicidal Behavior and Physical Activity in an Age-, Gender-, and Body Mass Index-Matched Adults
    MDPI AG ; 2020
    In:  International Journal of Environmental Research and Public Health Vol. 17, No. 22 ( 2020-11-11), p. 8350-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 17, No. 22 ( 2020-11-11), p. 8350-
    Abstract: The purpose of this study was to identify the association between physical activity (PA) and predictors of suicidal behaviors and to investigate whether the different PA measurements influence the association between PA and suicidal behaviors in South Korean adults. This study analyzed data from the National Health and Nutrition Examination Survey 2014–2015 data. The study selected participants who checked suicide-related questions as “Yes” (n = 99) and checked suicide-related questions as “No” (n = 99) in the questionnaire. The age, gender, and body mass index of participants between the two groups were matched. The moderate to vigorous PA (p = 0.000) and sedentary PA (p = 0.000), measured by accelerometers, were a significant risk factor for suicidal behaviors. Furthermore, the number of steps was a considerable difference between the two groups (healthy group: 61,495.76 steps; suicide group: 40,517.34 steps), and the accelerometer and questionnaire also showed significant differences. The study demonstrated that there were significant associations with physical activity and socioeconomic status and suicidal behaviors in anthropometry (i.e., age, gender, height, weight) matched groups. Additionally, this study highlights the importance of the assessment of PAs, and increasing PA levels could reduce the incidence of suicidal behaviors.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph17228350
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2175195-X
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  • 2
    Online Resource
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    Association between Health-Related Physical Fitness and Respiratory Diseases in Adolescents: An Age- and Gender-Matched Study
    MDPI AG ; 2021
    In:  International Journal of Environmental Research and Public Health Vol. 18, No. 12 ( 2021-06-21), p. 6655-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 18, No. 12 ( 2021-06-21), p. 6655-
    Abstract: The current study examined the differences in health-related physical fitness (HRPF), physical activity (PA), and sedentary behavior (SB) between adolescents with and without ongoing respiratory diseases (RD). This study’s participants were from 12 to 15 years old (7th–10th grade) in South Korea. Adolescents with RD were selected through RD-related questions (i.e., asthma, rhinitis, sinusitis, and bronchitis) (n = 139); in contrast, adolescents without RD, randomly selected from the general group, responded to any health problem-related questions as “No” (n = 139). HRPF was measured based on the FITNESSGRAM and EURO FIT test batteries and the measurements of HRPF included cardiovascular endurance, muscular strength, muscular endurance, flexibility, and body composition. All statistical analyses were conducted by SPSS 25.0, and the independent t-test was used to compare the HRPF and PA between the two groups. Moreover, the measured HRPF was compared with a series of analyses of three-way ANOVAs (age × gender × group). Adolescents with RD had a positive association with less participation in PA (p 〈 0.05; RD: 3081.81 ± 4793.37; general: 2073.64 ± 3123.47) and with more time spent on SB (above 12 h per week: RD group (38.85%) and general group (33.09%)). Furthermore, adolescents in the RD group showed significant effects on all components of HRPF (p 〈 0.05). Our study confirmed that HRPF is an essential predictor of adolescents’ health outcomes, especially for those with RD. We suggest that increased HRPF can be an effective treatment for respiratory diseases in adolescents, and health practitioners should pay more attention to helping adolescents with RD to gain or maintain high HRPF.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph18126655
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
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  • 3
    Online Resource
    Online Resource
    The Efficacy of a Calamansi-Containing Energy Drink on Running Performance and Recovery in NCAA Division I Middle-Distance Runners: A Preliminary Study
    MDPI AG ; 2021
    In:  International Journal of Environmental Research and Public Health Vol. 18, No. 21 ( 2021-10-20), p. 11023-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 18, No. 21 ( 2021-10-20), p. 11023-
    Abstract: This study examined the effects of a non-caffeinated energy drink (ED) that contained calamansi juice, glucose, and taurine on 3-km running performance and recovery. Eleven NCAA Division I middle-distance runners (20.8 ± 1.5 years old) were randomly assigned to consume either the ED or a placebo drink 60 min before 3-km running on a 400-m official track. Performance time and speed were recorded every 500-m interval. Recovery blood lactate concentration (BLC), systolic (SBP), diastolic blood pressure (DBP), and heart rate (HR) were measured at baseline, 60-min after ingesting the drinks, and post-running measurements were performed at 1-min, 5-min, and 10-min. Repeated analysis of variance and paired t-test were applied to examine the effects of time, trials, and their interaction on performance and recovery. Statistical significance was set a priori at p 〈 0.05. No significant difference was observed in performance time and speed between trials (p 〈 0.05). No interaction effect was found on performance time, speed, recovery BLC, DBP, and HR (p 〈 0.05). However, an interaction effect for trial by time was observed on SBP (p = 0.01). Recovery SBP continues to decrease from 5-min to 10-min in the ED trial (∆ = −13.9 mmHg) and slightly increased in the placebo trial (∆ = 1.1 mmHg). This study suggests that acute consumption of a calamansi-containing ED can positively impact the SBP recovery but not running performance. Further studies are needed to examine the acute and chronic effects of this ED on exercise performance and recovery among different populations.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph182111023
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Effects of Various Work-to-rest Ratios during High-intensity Interval Training on Athletic Performance in Adolescents
    Georg Thieme Verlag KG ; 2019
    In:  International Journal of Sports Medicine Vol. 40, No. 08 ( 2019-08), p. 503-510
    Details
    In: International Journal of Sports Medicine, Georg Thieme Verlag KG, Vol. 40, No. 08 ( 2019-08), p. 503-510
    Abstract: To examine the effect of high-intensity interval training (HIIT) with different work-to-rest ratios on athletic performance in athletes. Forty-seven male Taekwondo athletes (aged 15–18 yrs) were randomly assigned into 3 HIIT groups and a control group. Each group performed 6 and 8 bouts of HIIT: 1) 1:2 (30:60 s), 2) 1:4 (30:120 s), and 3) 1:8 (30:240 s) groups while the control group performed only Taekwondo training program. All HIIT groups completed 10 sessions over 4 weeks. Athletic performance tests including VO2max test, Wingate anaerobic test, vertical jump, and agility T-test were measured at both pre- and post-tests. Two-way repeated measures ANOVA were applied to examine the performance changes between protocols. VO2max improved significantly in all HIIT groups (p 〈 0.01), and the post-hoc test indicated that the only 1:4 group showed significant improvement compared to the control group. The HIIT with 1:4 ratio showed the effective protocol for enhancing anaerobic capacity including relative peak and mean power compared to control (p 〈 0.01). Ten sessions of HIIT involving the 1:4 group, lasting over a brief 4-week period revealed the effective protocol for enhancing both aerobic and anaerobic capacity. Our findings provide practical implications to develop a performance-enhancing program specialized for adolescent Taekwondo athletes.
    Type of Medium: Online Resource
    ISSN: 0172-4622 , 1439-3964
    URL: Article
    DOI: 10.1055/a-0927-6884
    RVK:
    ZX 1000
    Language: English
    Publisher: Georg Thieme Verlag KG
    Publication Date: 2019
    detail.hit.zdb_id: 2041541-2
    SSG: 31
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  • 5
    Online Resource
    Online Resource
    Vitamin D3 Supplementation on Immune Functions and Upper Respiratory Track Infection in Male Taekwondo Athletes : 2946 Board #229 June 1 3 30 PM - 5 00 PM
    Ovid Technologies (Wolters Kluwer Health) ; 2018
    In:  Medicine & Science in Sports & Exercise Vol. 50, No. 5S ( 2018-05), p. 730-
    Details
    In: Medicine & Science in Sports & Exercise, Ovid Technologies (Wolters Kluwer Health), Vol. 50, No. 5S ( 2018-05), p. 730-
    Type of Medium: Online Resource
    ISSN: 0195-9131
    URL: Article
    DOI: 10.1249/01.mss.0000538406.48824.20
    RVK:
    ZX 1000
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2018
    detail.hit.zdb_id: 2031167-9
    SSG: 31
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  • 6
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    Isokinetic assessment of agonist and antagonist strength ratios in collegiate taekwondo athletes: a preliminary study
    Springer Science and Business Media LLC ; 2017
    In:  Sport Sciences for Health Vol. 13, No. 1 ( 2017-4), p. 175-181
    Details
    In: Sport Sciences for Health, Springer Science and Business Media LLC, Vol. 13, No. 1 ( 2017-4), p. 175-181
    Type of Medium: Online Resource
    ISSN: 1824-7490 , 1825-1234
    URL: Article
    DOI: 10.1007/s11332-016-0337-2
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2017
    detail.hit.zdb_id: 2181783-2
    SSG: 31
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  • 7
    Online Resource
    Online Resource
    Association between Physical Activity and Respiratory Diseases in Adolescents: An Age- and Gender-Matched Study
    MDPI AG ; 2021
    In:  International Journal of Environmental Research and Public Health Vol. 18, No. 4 ( 2021-02-03), p. 1397-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 18, No. 4 ( 2021-02-03), p. 1397-
    Abstract: The purpose of the present cross-sectional study was to examine the impacts of allergic respiratory diseases on physical activity (PA), sedentary behaviors (SB), and body mass index (BMI) by matching age and gender with those adolescents without allergic respiratory diseases. This present study analyzed data from the 2019 Korea Youth Risk Behavior Web-based Survey (KYRBWS). Among 57,303 Korean adolescents who responded to the survey, the study divided adolescents into three different groups (i.e., general, asthma, and allergic rhinitis group). Asthma and allergic rhinitis groups included adolescents who checked on asthma- or allergic rhinitis-related questions as ‘yes’ (n = 259, n = 259), but the general group responded to any diseases-related question as ‘no’ (n = 259). The age and gender of participants among the three groups were matched. The results showed weight and BMI were significantly higher in asthma and allergic rhinitis groups compared to the general group (p 〈 0.001, p 〈 0.001). Furthermore, age, asthma, and allergic rhinitis were observed to be strong risk factors for predicting obesity in adolescents (BMI, 〉 25.0 kg/m2). In addition, this study found allergic respiratory diseases strong impacts on BMI levels because adolescents with ongoing asthma, or allergic rhinitis symptoms were more likely to have the inevitability of further weight gain compared to the general adolescents. Therefore, not only national interest in adolescents with allergic respiratory disease is essential, but PA should be encouraged to prevent and alleviate these diseases due to obesity.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph18041397
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
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  • 8
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    Comparisons of Muscle Quality and Muscle Growth Factor Between Sarcopenic and Non-Sarcopenic Older Women
    MDPI AG ; 2020
    In:  International Journal of Environmental Research and Public Health Vol. 17, No. 18 ( 2020-09-10), p. 6581-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 17, No. 18 ( 2020-09-10), p. 6581-
    Abstract: Sarcopenia, an age-related disease, is one of the important health problems in the elderly and the prevalence of sarcopenia is rapidly increased among the Korean population. This study examined the muscle quality and muscle growth factors of elderly women to identify the potential diagnostic tool for sarcopenia. One hundred and thirty-six elderly women, aged over 65 years old, initially enrolled, but only 59 participants who met the criteria (sarcopenic group, n = 27; non-sarcopenic group, n = 32) completed the study. Muscle quality assessment included thigh cross-sectional computed tomography scan and maximal isometric muscle strength. Muscle growth factors such as GDF-15, myostatin, activin A, and follistatin were analyzed, and a battery of Senior Fitness Test was used to examine functional fitness. The statistical significance level was set at 0.05. Elderly women with sarcopenia had a lower thigh muscle volume (−20.1%), and a higher thigh intermuscular adipose tissue (15.8%) than those of the non-sarcopenic group (p 〈 0.05). However, no significant differences in muscle growth factors were observed between the groups. Muscle quality variables including maximal voluntary isometric contraction (OR: 0.968, p 〈 0.001), relative maximal voluntary isometric contraction (OR: 0.989, p 〈 0.05), thigh muscle volume (OR: 0.836, p 〈 0.001), and thigh intermuscular adipose tissue (OR: 1.138, p 〈 0.05) were associated with a risk of sarcopenia. Our findings suggest that the sarcopenic group exhibits a poor thigh muscle quality in comparison with the non-sarcopenic group. Muscle quality assessment can be utilized for sarcopenia identification, but our study remains inconclusive for the causality of muscle growth factors in sarcopenia.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph17186581
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
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  • 9
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    The Associations of Vitamin D Status with Athletic Performance and Blood-borne Markers in Adolescent Athletes: A Cross-Sectional Study
    MDPI AG ; 2019
    In:  International Journal of Environmental Research and Public Health Vol. 16, No. 18 ( 2019-09-14), p. 3422-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 16, No. 18 ( 2019-09-14), p. 3422-
    Abstract: The purpose of this study was to examine the associations of vitamin D status with athletic performance and blood-borne markers in adolescent athletes. This cross-sectional study included forty-seven Taekwondo athletes, aged 15–18 years old. Athletic performance was assessed using maximal oxygen consumption (VO2max), Wingate anaerobic power test, vertical jump, agility T-test, lower limb muscle strength, and fatigue resistance. Blood samples were collected to assess serum 25-hydroxyvitamin D [25(OH)D], free-testosterone, cortisol, creatine kinase, and urea. One-way ANOVAs were applied using Bonferroni adjusted alpha levels, which was 0.02 (i.e., 0.05/3). Multiple linear regressions analyses as well as Pearson and partial correlation analyses were used to examine the relationship among 25(OH)D concentration, athletic performance, and blood-borne markers. The participants 25(OH)D concentration were ranged from 16 to 73.25 nmol/L, indicating that 74.5% of the adolescent athletes have vitamin D insufficiency or deficiency. The vitamin D status did not show any significant effects on the performance factors or blood-borne markers. Serum 25(OH)D concentration was positively correlated with mean power output (r = 0.359, p 〈 0.05) and relative mean power output (r = 0.325, p 〈 0.05) after adjusting for bone age, height, weight, training experience, lean body mass, and fat mass. However, 25(OH)D concentration was not associated with other performance-related factors and blood-borne markers. In addition, multiple linear regressions analyses revealed that serum 25(OH)D concentration were not significant predictors of athletic performance in adolescent athletes. In conclusion, vitamin D status is weakly correlated with anaerobic capacity; moreover, the underlying mechanisms of how vitamin D influence anaerobic performance is unclear in the present study. Nevertheless, the importance of vitamin D on health benefits should not be underestimated, especially during growth periods.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph16183422
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
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  • 10
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    Effects of 16 Weeks of Resistance Training on Muscle Quality and Muscle Growth Factors in Older Adult Women with Sarcopenia: A Randomized Controlled Trial
    MDPI AG ; 2021
    In:  International Journal of Environmental Research and Public Health Vol. 18, No. 13 ( 2021-06-23), p. 6762-
    Details
    In: International Journal of Environmental Research and Public Health, MDPI AG, Vol. 18, No. 13 ( 2021-06-23), p. 6762-
    Abstract: This study examined the effects of resistance training on muscle quality, muscle growth factors, and functional fitness in older adult women with sarcopenia. Twenty-two older adult women aged over 65 with sarcopenia were randomly assigned to either resistance training (RT, n = 12) or non-exercise control group (CG, n = 10). The body weight-based and elastic band RT were performed three times a week, 60 min per session, for 16 weeks. Body composition and thigh muscle quality were estimated by dual-energy X-ray absorptiometry (DEXA) and computed tomography (CT), respectively. The muscle growth factors, including growth differentiation factor-8 (GDF-8), growth differentiation factor-15 (GDF-15), activin A, and follistatin, were analyzed via blood samples. Statistical analyses were performed using repeated measures multivariate analysis of variance (MANOVA), analysis of variance (ANOVA), and effect size (i.e., cohen’s d, partial eta square), and the significance level was set at 0.05. The RT group improved their functional fitness, grip strength, gait speed, and isometric muscle strength (p 〈 0.01, d 〉 0.99; large), while these variables did not change in the CG. An increase in intramuscular fat was only observed in the CG (p 〈 0.01, 1.06; large). Muscle growth factors such as follistatin were significantly increased in the RT (p 〈 0.05, 0.81; large), but other variables did not change following resistance training. Sixteen weeks of resistance training improved functional fitness and prevented age-related increases in intramuscular fat in the thigh area. However, there were only some changes in muscle growth factors, such as follistatin, suggesting that the effectiveness of resistance training on muscle growth factors is limited. Body weight-based and elastic band resistance training is an alternative training method for sarcopenia to minimize the age-related adverse effects on muscle function and quality.
    Type of Medium: Online Resource
    ISSN: 1660-4601
    URL: Article
    DOI: 10.3390/ijerph18136762
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
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