간행물

운동과학 update

Official Journal of the Korea Exercise Science Academy

  • : 한국운동생리학회
  • : 예체능분야  >  체육학
  • : KCI등재
  • : SCOPUS
  • : 연속간행물
  • : 계간
  • : 1226-1726
  • : 2384-0544
  • : 한국운동과학회(~1995) → 운동과학(1996~)

수록정보
29권2호(2020) |수록논문 수 : 12
간행물 제목
31권2호(2022년 05월) 수록논문
최근 권호 논문
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KCI등재 SCOPUS

저자 : Song-young Park

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 157-158 (2 pages)

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KCI등재 SCOPUS

저자 : Junechul Kim , Bo-eun Yoon , Jinho Park , Eun Hye Kwon , Kyungun Kim , Sukho Lee

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 159-167 (9 pages)

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PURPOSE: Maternal nutrition plays a crucial role in fetal growth and lifelong health outcomes. Folate is an essential methyl donor in the epigenetic programming of offspring. This review and meta-analysis was conducted to compile the evidence reported thus far to identify associations between maternal folate status and childhood obesity.
METHODS: A keyword/reference search was performed in EBSCOhost and Web of Science databases. A CMA program was used for a meta-analysis to estimate the pooled effect of maternal folate status on childhood obesity in offspring and to examine the influence of moderating variables on the overall effect.
RESULTS: Better maternal folate intake was associated with a lower risk of childhood obesity: the overall effect size (ES; Hedges' g) was 0.168 (95% CI=0.075 to 0.260, p<.001; small effects; cf., Cohen's criteria). Moderator analysis revealed that the ≥Q statistic for the age group was statistically significant (Qb=4.730, df=1. p=.030; heterogeneity of ES). In offspring < 7 years and >7 years, the ES was 0.277 (95% CI=0.151, 0.404) and 0.089 (95% CI=-0.025, 0.202), respectively. The study design was a statistically significant variable (Qb=4.310, df=1. p=.038; heterogeneity of ES). In cohort studies, ES was 0.251 (95% CI=0.135, 0.367), whereas in randomized controlled trial group, ES was 0.062 (95% CI=-0.073, 0.197).
CONCLUSIONS: Maternal folate intake significantly affects childhood obesity, and the effect of maternal folate status is stronger in children younger than 7 years.

KCI등재 SCOPUS

저자 : Karamatollah Rahmanian , Farhang Hooshmand , Masihollah Shakeri , Vahid Rahmanian , Fatemeh Sotoodeh Jahromi , Abdolreza Sotoodeh Jahromi

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 168-172 (5 pages)

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PURPOSE: This study aimed to assess alterations in serum creatine kinase (CK) and lactate dehydrogenase (LDH) levels after performing a lactate tolerance exercise test (LTET) in elite male swimmers.
METHODS: Fourteen male adolescent swimmers participated in this study. All subjects performed LTET (8×100-meter swimming) with a 1-minute recovery interval between eight trainings. Plasma CK and LDH (markers of muscle damage) levels were measured 30 minute before and 24 hours after the test. A paired t-test was used for statistical analysis of data.
RESULTS: Plasma CK and LDH levels increased immediately after LTET as compared to the values 30 minutes prior to exercise (188.91±34.04 vs. 148.83±29.63 mg/dL, p=.029; 318.17±53.89 vs. 272.08±52.93 mg/dL, p=.010, respectively). Both CK and LDH levels displayed a decreasing trend 24 hours post-LTET; however, there was no significant difference immediately after the test.
CONCLUSIONS: Plasma CK and LDH levels increased following LTET, which is representative of muscle damage.

KCI등재 SCOPUS

저자 : 권지혜 ( Jihye Gwon ) , 신지호 ( Jiho Shin ) , 강현식 ( Hyunsik Kang )

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 173-180 (8 pages)

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PURPOSE: This cross-sectional study examined the combined effects of nutritional health risk and physical activity on depressive symptoms in a representative sample of older adults aged 65 years and older (4,116 men and 5,154 women) from the 2020 Korea Longitudinal Study of Aging.
METHODS: Nutritional health risk was categorized as good, moderate, and high according to the Nutrition Screening Initiative. Physical activity was assessed using a questionnaire. Depression was assessed using the Short Form of Geriatric Depression Scale (SGDS).
RESULTS: There were significant age differences (p<.001), education level (p<.001), marital status (p<.001), and SDGS (p<.001) according to nutritional health risk or physical activity status. In particular, a general linear model (GLM) showed a significant interaction (R2=.239, F(2,9849)=5.582, p<.004) between nutritional health risk and physical activity on SGDS-based depressive symptoms. The antidepressant effect of regular physical activity was observed in individuals with good or moderate nutritional health risks. However, such beneficial effects of physical activity were not observed in individuals with high nutritional health risks.
CONCLUSIONS: The current findings of this study suggest that both good nutrition and physical activity for mental health should be emphasized in older adults, with a greater focus on nutrition for those with a high nutritional health risk.

KCI등재 SCOPUS

저자 : Kwang-bin An , Hye-joo Jeon , Woo-nam Chang

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 181-187 (7 pages)

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PURPOSE: Respiratory function can be adversely affected after a cerebrovascular accident. This study aimed to determine whether inspiratory muscle training (IMT) changes the respiration and balance abilities of patients with stroke.
METHODS: Twelve patients with stroke were randomly assigned to the study (n=6) and control (n=6) groups. The study and control groups received IMT and general physical therapy, respectively for 6 weeks, five times a week for 30 min/day. Inspiratory and expiratory functions and balance were measured pre- and post-evaluation.
RESULTS: After IMT intervention, the weight distribution ratio (WDR) for balance ability measurement was significantly decreased (p<.05), and the maximum inspiratory pressure (MIP), maximum inspiratory flow rate (MIFR), maximum inspiratory capacity (MIC), peak expiratory flow (PEF), forced expiratory volume in 1 second (FEV1), and limits of stability (LOS) were significantly increased in the study group (p<.05). A comparison of the study and control groups revealed statistically significant differences in MIP (p<0.01), MIFR (p<.01), MIC (p<.05), PEF (p<.05), FEV1 (p<.05), WDR (p<.01), and LOS (p<.05).
CONCLUSIONS: This study suggests that IMT is a useful and effective exercise intervention for patients with stroke.

KCI등재 SCOPUS

저자 : Su-yeon Jin , Hwang-woon Moon , Jun-su Kim , Ha-young Kim

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 188-196 (9 pages)

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PURPOSE: This study aimed to examine the immunological effects of β-alanine intake for 4 weeks on immune function changes after long-distance exercise and the possibility of β-alanine intake as an effective exercise supplement to improve exercise performance and maintain immune function.
METHODS: Eighteen male college students were randomly assigned to two groups, one with two capsules of 250 mg β-alanine and the other with placebo without a nutritional effect. The participants took one capsule each in the morning and evening after the meals. This study was conducted in a double-blinded manner. To analyze the inflammatory cytokines expressed during exercise, a 10 km long-running exercise was performed, and blood was collected from the forearm vein a total of 4 times (at rest, immediately after exercise, 30 minutes, and 60 minutes in recovery).
RESULTS: As a result of analyzing the level of inflammatory cytokine IL-6, compared to the placebo group, the β-alanine intake group decreased significantly to 60 minutes after recovery from long-distance aerobic exercise, and both groups showed a significant difference between both periods (p<.001). However, there was no significant difference between the groups based on the measurement period before and after intake. As a result of analyzing the level of TNF-β, the expression of TNF-β in the placebo group was significantly decreased from immediately after long-distance aerobic exercise to 60 minutes after recovery, but in the β-alanine group, TNF-β expression did not occur immediately after exercise, and there was no significant difference until the recovery period; thus, there was no statistically significant difference between the two periods. In addition, there was no significant difference between the groups in terms of the measurement period before and after intake.
CONCLUSIONS: Based on the above results, β-alanine intake for 4 weeks is thought to be effective in maintaining temporarily reduced immune function after long-distance exercise by reducing the level of inflammatory cytokines in the study participants.

KCI등재 SCOPUS

저자 : Jiseop Lee , Junkyung Song , Jaebum Park

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 197-206 (10 pages)

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PURPOSE: To investigate the effect of muscle vibration on performance accuracy and multi-muscle coordination pattern during voluntary isometric knee extension torque production.
METHODS: The subjects were tested under two conditions of external vibration frequencies (90 Hz vibration (VIB)&no-vibration (NVIB)) with three levels of torque magnitudes of 20% (MVT20), 40% (MVT40), and 60% of maximal voluntary torque (MVT60). The subjects were instructed to perform a submaximal isometric ramp task and matched the produced torque with the torque template shown in the screen as accurately as possible. External vibration was applied to the rectus femoris (RF).
RESULTS: The performance error (RMSENORM) was reduced in 60% of MVT (MVT60) in both ramp and SS phases, and the iEMGAGO was significantly reduced by vibration under the same torque conditions in the SS phase. In addition, the muscle-mode (M-mode) composition was found to be different in the VIB and NVIB in the SS phase. We found that the VIB condition showed co-contraction M-modes and mixed M-modes. However, there was no significant difference in the ramp phase under all conditions.
CONCLUSIONS: The neurophysiological changes due to muscle vibration may positively affect the task characteristics and steps that require accurate torque generation and provide information for the quantitative understanding of multi-muscle coordination of vibration.

KCI등재 SCOPUS

저자 : 박지용 ( Ji-yong Park ) , 권태원 ( Tae-won Gwon )

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 207-214 (8 pages)

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PURPOSE: This study aimed to consider the validity of relative weight indices, which are used to compare people of different heights.
METHODS: Cross-sectional analyses were conducted using the 2017-2021 “National Fitness Award” in South Korea. Males (n=77,705) aged 18-65 years and females (n=84,641) were included. Three indices [I1=kg/m, I2=kg/㎡, and I3=kg/㎥] and I4 [I4=kg/㎡], which simply reduce the standard error of I1, were analyzed. Pearson's correlation analysis was conducted to determine an index that was highly correlated with weight and was independent of height. Furthermore, an index that was highly correlated with the body fat percentage was considered. The linear relationship between height and the indices was confirmed using regression analysis. The n value of the index (kg/mn), which provides the same value for all height ranges, was derived by regression analysis between weight and height.
RESULTS: The correlation analysis between height and the indices described I2 (r=-.009, p<.05) as the most suitable for males. The I1 and I4 (r=-.049, p<.01) were appropriate for females. Weight showed a significant correlation with all indices. The association between body fat percentage and I3 showed a high correlation in both males (r=.722, p<.01) and females (r=.734, p<.01). Regression analyses represented I2 (B=-.005, p<.05) suitability for males. For females, I4 (B=.022, p<.01) was replaceable.
CONCLUSIONS: The results of this study suggest that I2 (kg/㎡) is appropriate for males. The I4 (kg/㎡) was applicable to females. The I3 (kg/㎥) showed the strongest correlation with body fat percentage in both males and females.

KCI등재 SCOPUS

저자 : 이광진 ( Kwang-jin Lee )

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 215-221 (7 pages)

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PURPOSE: This study aimed to investigate the effects of circuit-type neuromuscular training (CTNT) on strength, power, and functional performance among the MZ generation.
METHODS: Twenty-eight participants were assigned to either the circuit-type neuromuscular training group (CTNTG, n=14) or the control group (CG, n=14). CTNT was performed for 50 minutes a day, 2-3 times a week, for 6 weeks. The CG only performed activities of daily living during the study period. Baseline and post measures included isometric muscular strength (knee flexion, knee extension, back flexion, back extension), vertical jump, 30 m sprint, T-agility, and Y-balance tests.
RESULTS: The results showed that the CTNT had a positive effect on the improvement of knee flexion (p=.015), knee extension (p=.047), back extension (p=.003), vertical jump (p=.025), T-agility (p=.046), posteromedial (p=.031), posterolateral (p=.022), and composite score (p=.032).
CONCLUSIONS: These findings can be a factor that the strength, power, and functional performance of MZ generation can be sufficiently improved through the CTNT program. This suggests that CTNT is the most appropriate exercise intervention method to improve the strength, power, and functional performance of the MZ generation.

KCI등재 SCOPUS

저자 : 선세영 ( Se-young Seon ) , 안근옥 ( Keun-ok An ) , 이광진 ( Kwang-jin Lee )

발행기관 : 한국운동생리학회 간행물 : 운동과학 31권 2호 발행 연도 : 2022 페이지 : pp. 222-229 (8 pages)

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PURPOSE: This study aimed to investigate the effect of dynamic warm-up (DW), including DW and self-myofascial release (SMFR), on soft tissue stiffness and exercise performance.
METHODS: Eight adult men participated in this study. The procedure was conducted twice every 2 weeks. Soft tissue stiffness measurements and exercise performance were performed as a pre-post-test. DW only and DW with SMFR were performed as an exercise intervention for the two groups, respectively.
RESULTS: In the group conducted solely by DW, the stiffness of the gastrocnemius and rectus femoris muscles increased (p<.05), and in the DW group including SMFR, the stiffness of the rectus femoris muscle (p<.01) and biceps femoris muscle increased (p<.05). The Achilles and patellar tendon showed no significant changes in either group. A significant increase was observed in both the DW group and the DW group containing SMFR in the 30 m sprint (p<.01). The vertical jump (VJ) showed no significant change in both groups.
CONCLUSIONS: Therefore, DW, including DW with SMFR, increased muscle stiffness, specifically through a 30-m sprint. In a follow-up study, it is considered necessary to investigate the effect of the VJ through the development of a DW program that changes the stiffness of tendons.

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KCI등재SCOUPUS

저자 : 김창선 ( Changsun Kim )

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 107-108 (2 pages)

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KCI등재SCOUPUS

저자 : 김경민 ( Kyung Min Kim ) , 강현주 ( Hyun Joo Kang )

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 109-120 (12 pages)

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PURPOSE: Sarcopenia, also known as the age-related loss of muscle mass and muscle fitness, and physical performance, has been related to many adverse health outcomes. Resistance exercise may have an important role in effecting strategy for sarcopenia in aging populations. The purpose of this study is to systematically assess the effects resistance exercise interventions on muscle mass, muscle strength, and physical performance in elderly diagnosed with sarcopenia.
METHODS: A comprehensive search on electronic databases, including PubMed, EMBASE, CINAHLPlus, SPORTDiscus, KERIS, KISS, and NAL were conducted. Eligible studies were divided into exercise and randomized controlled trials in elderly with sarcopenia. Searches retrieved 1,067 titles. Eighty full texts were evaluated, and seven studies were used for final systematic reviews. CMA (Comprehensive Meta-Analysis) ver 3.0 was used for meta-analysis.
RESULTS: Meta-analysis showed that lower muscle mass (ES=0.579, 95% CI: 0.266-0.892, p=.000), appendicular muscle mass (ES=0.341, 95% CI: 0.006-0.676, p=.046), right hand grip strength (ES=0.739, 95% CI: 0.216-1.262, p=.006), left hand grip strength (ES=0.692, 95% CI: 0.167-1.217, p=.010), knee extension strength (ES=1.448, 95% CI: 0.273-2.624, p=.016), and timed up and go (ES=1.471, 95% CI: 0.492-2.450, p=.003) significantly improved in response to resistance exercise programs.
CONCLUSIONS: Sarcopenia is increasing with the growing elderly population; thus prevention and effective interventions are very important. The data suggest that resistance exercise may be actual in enhancing not only appendicular muscle mass, but also knee extension strength and timed up and go in elderly diagnosed with sarcopenia. Further follow-up studies on larger populations and a variety of approaches are required to reconfirm these results.

KCI등재SCOUPUS

저자 : Hyung-pil Jun , Eunwook Chang

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 121-128 (8 pages)

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PURPOSE: The purpose of this study was to confirm the kinematic characteristics of overuse leg injuries during gait through a systematic review.
METHODS: Electronic databases from 1960 to 2018 were used to search studies. Physiotherapy Evidence Database Scale was used for quality of studies. Effect sizes (ES) of between-groups and its 95% confidence intervals were calculated.
RESULTS: Seven studies were selected for review. The average Physiotherapy Evidence Database Scale score was 4.3 of 10-point scale. The ES for maximum rearfoot eversion from 5 studies ranged from -0.34 to 0.67 with 3 of 5 studies statistically significant. The ES of eversion excursion from 4 studies ranged from -0.24 to 2.37 and 3 of 4 studies showed statistically significant. The ES of maximum eversion velocity ranged from 0.29 to 0.38 from all of 2 studies. With abduction, the ES for abduction excursion ranged from -0.04 to 0.35, and 2 of 3 studies revealed statistically significant. The ES of maximum abduction velocity showed statistically significant with the ES of 0.23 and 0.61. However, maximum abduction from 3 studies showed non-significant with ES ranges from 0.00 to 0.62.
CONCLUSIONS: The rearfoot motion (eversion) associates with overuse leg injuries during gait more than tibial motion (internal rotation).

KCI등재SCOUPUS

저자 : Corinna Wawer , Oliver Heine , Hans-georg Predel , Md Da-sol Park , Bs Woo-hwi Yang

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 129-137 (9 pages)

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PURPOSE: A number of physiological diagnostics were developed. However, the timeline-related diagnostics of maximal anaerobic glycolytic capacity remain unclear. The objective of this study was to evaluate the reliability and validity of a sprint running test to assess the anaerobic capacity.
METHODS: The study was divided into three parts. Sixty-one male (24±4 years, 181.0±4.3 cm; 78.5±5.9 kg) and twelve female (25±3 years, 167.0±0.6 cm, 60.4±5.7 kg) sports students participated in this study. Twenty-five subjects (13 males, 24±2 years, 181.0±0.5 cm, 78.5±5.9 kg; 12 females, 25±3 years, 167.0±0.6 cm, 60.4±5.7 kg) performed incremental step tests at running track and several linear sprints on a running track (LSRT) with different time durations (8, 10, 12, and 14 seconds)(part I) on different days. Twenty-five male subjects (24±3 years, 180.7±6.7 cm, 84.6±8.8 kg) conducted a 10 or 12 second sprint running on a non-motorized treadmill (NMT)(part II). In part III, twenty-three male subjects (24±2 years, 181.4±5.8 cm, 74.5±7.4 kg) ran a 10 second LSRT and NMT on consecutive days. Capillary blood samplings were taken before (Lacr) and after the sprint running for ten minutes at one minute intervals to find out maximal lactate concentration after exercise and to calculate the maximum lactate production rate (LPRmax).
RESULTS: For all parts reliability for LPRmax was proven (Part I: 8 seconds: ICC: r=.89; 10 seconds: ICC: r=.82; 12 seconds: ICC: r=.92; 14 seconds: r=.84, respectively; Part II: 10 seconds: ICC: r=.76; 12 seconds: ICC: r=.79). To analyze validity for LPRmax, Part III was conducted and proven valid (ICC: r=.96, p=.074).
CONCLUSIONS: We demonstrate that LSRT and NMT reliably determine anaerobic capacity and can be used as a valid tool for physiological performance diagnostics.

KCI등재SCOUPUS

저자 : 백경아 ( Kyung A Back ) , 박세환 ( Se Hwan Park ) , 윤진환 ( Jin Hwan Yoon )

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 138-145 (8 pages)

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PURPOSE: Osteoporosis is a public health problem that requires constant attention in an aging society. This study examines the effects of 12 weeks of resistance training on serum sex steroid hormone and bone metabolism factors in orchiectomized rats.
METHODS: A total of 30 male Sprague-Dawley (20 week-old) rats divided into three groups; (1) CON (normal-control, n=10), (2) ORX-CON (orchiectomized-control, n=10), (3) ORX-RE (orchiectomized-resistance exercise, n=10). The resistance training performed ladder climbing (8 repetitions, three days per week for 12 weeks) starting 1 week after surgery.
RESULTS: The investigation revealed that compared to the CON group, the ORX-CON group showed significantly lower levels of testosterone, dihydrotestosterone (DHT), grip strength, bone mineral density (BMD) and breaking force, but much higher levels of osteocalcin and CTx-1. The ORX-RE group showed increased grip strength, hormones (testosterone and DHT), osteocalcin, and BMD compared to ORX-CON group.
CONCLUSIONS: These findings suggest that resistance exercise training may be an intervention strategy for prevention osteoporosis and fracture in male aging process.

KCI등재SCOUPUS

저자 : 이인환 ( Inhwan Lee ) , 김병로 ( Byungroh Kim )

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 146-153 (8 pages)

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PURPOSE: This study investigated the association between estimated cardiorespiratory fitness (eCRF) and all-cause mortality in underweight older adults.
METHODS: Data from the 2006 Korean longitudinal study of aging (KLoSA) involving 348 study participants aged 60 years and older (58.0% women) was analyzed in this study. CRF was estimated with sex- and age-specific algorithms developed by the fitness registry and the importance of exercise national database (FRIEND). Participants were classified into lowest 25% (Q1), lower 25% (Q2), middle 25% (Q3), and highest 25% (Q4) on the basis of individual eCRF distributions. Cox proportional hazards regression was used to calculate hazard ratio (HR) and 95% confidence interval (CI) according to eCRF levels.
RESULTS: During 7.8±3.2-year follow-up period, a total of 175 deaths occurred from all causes. Cox regression analysis showed that HR of all-cause mortality was 0.686 (95% CI, 0.474-0.991, p=.045) for Q2, 0.382 (95% CI, 0.253-0.575, p<.001) for Q3, and 0.248 (95% CI, 0.155-0.397, p<.001) for Q4 compared to Q1 as reference (HR=1). The HR of Q4 for all-cause mortality remained significant even after adjustments for covariates, including age and marital status.
CONCLUSIONS: The current findings suggest that high eCRF is associated with a decreased risk of all-cause mortality in underweight older adults.

KCI등재SCOUPUS

저자 : Sang Gook Seo , Se Hwan Park , Jin-hwan Yoon , Byeong-wan Kim , Hyunseok Jee

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 154-161 (8 pages)

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PURPOSE: The purpose of this study was to investigate the effects of 5 weeks of basic military training on the physical fitness and blood biochemical factors in obese military recruits.
METHODS: Forty-eight male recruits (20-25 years of age) were randomly assigned to the Control group and Exercise group. Both groups completed 5 weeks of basic military training. The Exercise group additionally performed a resistance exercise twice daily in the morning and afternoon (1-3 sets, 3 days per week) and power walking (60-80% HRmax, 30 minutes) four times weekly. Four body composition variables, physical fitness factors, serum lipid profiles, and obesity-related hormone levels were analyzed.
RESULTS: Body weight, body fat ratio, body mass index, and waist circumference were significantly decreased in both groups between pre- and post-exercise tests (p<.01). However, no changes in these parameters were observed between the Control and Exercise groups. Twenty-meter shuttle running and maximal oxygen uptake were significantly increased post exercise (p<.001). Total cholesterol, triglyceride, and low-density lipoprotein levels were significantly decreased in both (Control and Exercise) post-exercise tests (p<.05). Leptin in both groups was significantly decreased; however, ghrelin showed a reverse pattern (p<.01). A significantly changed maximal oxygen uptake value via training was noted in both groups (p<.001). The time and interaction between the groups and the time were also significantly affected (p<.001).
CONCLUSIONS: Our findings suggest that an additional exercise-training program with the basic military training plays an important role in improving military fitness and combat power.

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저자 : 강예진 ( Yejin Kang ) , 이루다 ( Ruda Lee ) , 황문현 ( Moon-hyon Hwang ) , 임명주 ( Myong-joo Lim )

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 162-169 (8 pages)

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PURPOSE: This study aimed to compare the acute effects of different types (treadmill vs. cycle) of moderate-intensity aerobic exercise on cerebral blood flow and cognitive function in young adults.
METHODS: By a randomized crossover study design, ten participants were initially assigned to either treadmill exercise (TE; n=5) or cycle ergometer exercise (CE; n=5) and then they performed the other with seven-day wash-out period. Both exercises were implemented at the target heart rate corresponding to 70% of heart rate reserve for 30 minutes. Cognitive function was assessed by the Stroop Color-Word test at pre- and post-exercise. Cerebral blood flow was continuously monitored using near-infrared spectroscopy technique during rest, cognitive function test (CFT), and exercise.
RESULTS: There was a significant group by time interaction in tissue saturation index (TSI) (p=.046). Post-hoc analysis presented that TSI at post-exercise CFT was higher than during exercise in TE (p=.02). In both exercises, TSI at pre-exercise CFT significantly increased compared to the resting value (p=.001). Cerebral oxyhemoglobin level was significantly increased during exercise and at post-exercise CFT compared to the resting value in both exercises (p<.001). The reaction time for certain cognitive tasks such as color, word with matched color, word with color interference, and color with word interference was improved after both exercises (p<.05).
CONCLUSIONS: One-bout of moderate-intensity aerobic exercise acutely improves cerebral blood flow and cognitive function even in healthy young adults. Exercise types with the same intensity do not seem to make meaningful difference in the positive effects of aerobic exercise.

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저자 : Jun-il Yoo , Jinkyung Cho , Kyung-wan Baek , Min-ho Kim , Ji-seok Kim

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 170-177 (8 pages)

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PURPOSE: The purpose of this study was to investigate the relationship of smartphone use time, sitting time, and fitness level in university students.
METHODS: The participants of this study were 237 healthy university students (157 males and 80 females) enrolled from 2017 to 2018. The smartphone use time was divided into three groups: 0-4, ≥4-10, and ≥10 hours, as was the sitting time: 0-4, 4-7, and ≥7 hours. Binary logistic regression was used to calculate the odd ratio (OR) and 95% confidence interval (CI) of the smartphone use time and sitting time for having low levels of fitness.
RESULTS: There were linear decreases in physical fitness levels across incremental smartphone use time and sitting time. Compared to the smartphone use time for 0-4 hours (reference), smartphone use time for the ≥4-10 hours (OR=2.498; 95% CI=1.007-6.197; p=.048) or the 10≥group (OR=3.516; 95% CI=1.228-10.064; p=.019) had significantly higher ORs of having lower fitness even after adjustments for age, sex, physical activity and percent body fat. Likewise, logistic regression analyses showed that those who had sitting time for ≥7 hours (OR=3.135; 95% CI=1.155-8.512; p=.025) had significantly higher ORs of having lower fitness even after adjustments for age, sex, physical activity, and percent body fat, as compared with those who had sitting time for 0-<4 hours.
CONCLUSIONS: The current finding suggest that the smartphone using time and sitting time were associated with having the risk of lower level of physical fitness in university students.

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저자 : 김동현 ( Dong-hyun Kim ) , 김인재 ( In-jae Kim )

발행기관 : 한국운동생리학회 간행물 : 운동과학 29권 2호 발행 연도 : 2020 페이지 : pp. 178-187 (10 pages)

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PURPOSE: The purpose of this study was to analyze the effects of aerobic exercise on the expression of synaptic vesicle transporter and antioxidant enzymes in obesity and to investigate the feasibility of exercise training to reduce AD pathogenesis in the 3xTg-AD mice fed a high fat diet.
METHODS: Male 3 month old 3xTg-AD mice were divided into standard chow(SC, n=10), standard chow+exercise (SC-EXE, n=10), high fat diet (HFD, n=10), and high fat diet+exercise (HFD-EXE, n=10) groups. EXE mice were subjected to treadmill running at a moderate intensity with duration of 30 minutes per day and frequency of 5 days per week for 12 weeks. HFD mice were fed a 60% fat HFD during the same period. Mice were sacrificed and immunohistology and western blot analysis were performed.
RESULTS: Compared with the SC mice, the HFD mice had significantly higher levels of Aβ (p<.01), p-tau/t-tau (p<.01) and defects of Vglut1 (p<.05), VGAT (p<.05), postsynaptic density 95 (p<.01) and GPX (p<.05) in the hippocampus. On the other hand, we found that treadmill running attenuated HFD-induced exacerbations of Aβ (p<.01), p-tau/t-tau (p<.05) and defects of Vglut1 (p<.01), Synaptophysin (p<.05), SOD1 (p<.05) in the hippocampus.
CONCLUSIONS: High fat diet-induced obesity resulted in increased AD neuropathology and decreased synaptic vesicle transporter and antioxidant enzyme in the hippocampus of 3xTg-AD mice. However, aerobic exercise delayed AD-like disease progression, alleviated impaired synaptic function and the decreased expression of antioxidant enzymes in the hippocampus.

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