PURPOSE This systematic review and meta-analysis aimed to assess the effectiveness of exercise programs in improving physical fitness among middle-aged adults in Korea. METHODS A literature search was conducted using KCI-registered databases on DBpia, RISS, and KISS up to September 21, 2023. The review followed the PICOSD framework (population: middle-aged adults; intervention: exercise program; comparison: did not participate in exercise program; outcome: physical fitness; study design: randomized controlled trials). Two researchers independently evaluated bias using the Cochrane Risk of Bias tool for randomized trials (RoB 2). The data was synthesized using the CMA 3.0 program, applying a random effects model to estimate the overall effect size using Hedges’g. RESULTS Out of 914 screened documents, 15 studies were selected, comprising 405 participants. The overall effect size for improving physical fitness was significant (g=0.994, 95% CI: 0.712–1.276). Sub-analysis indicated significant improvements in various components, including muscle strength (g=1.295, 95% CI: 0.909-1.682), muscular endurance (g=0.972, 95% CI: 0.637-1.308), cardiorespiratory endurance (g=1.092, 95% CI: 0.453–1.731), flexibility (g=0.883, 95% CI: 0.555–1.210), muscle power (g=1.421, 95% CI: 0.656– 2.186), and agility (g=1.854, 95% CI: 0.347–3.361) compared to the control group. An additional analysis focusing solely on women revealed a slight increase in effect size, although the order of effect sizes remained consistent across fitness components. CONCLUSIONS This meta-analysis confirms the effectiveness of exercise programs in enhancing physical fitness in middle-aged adults. The systematic review also highlights key considerations for designing exercise programs for this demographic. Future studies should aim to minimize bias and enhance the quality of reporting to ensure more robust results.
Circadian rhythm (CR) is an intrinsic process that changes in a cycle of approximately 24h/day to maintain body homeostasis. It is mainly controlled by the central command through the suprachiasmatic nucleus, and modern society features can disturb the central CR, contributing to various diseases. Recent studies have provided evidence that extrinsic factors, such as regular physical activity (RPA) and timerestricted feeding (TRF), can also alter the CR peripherally, emphasizing RPA and TRF as the non-therapeutic methods for circadian misalignment (CM). Therefore, this review scrutinizes the regulatory mechanism of CR and summarizes the relationships between CM and various diseases. In addition, by reviewing studies investigating the prevention or improvement of CM via RPA and TRF, the value of circadian biology research that can directly affect health, physical function, and lifespan is summarized. By introducing the scientific evidence for RPA and TRF to maintain and improve CR, we tried to emphasize the importance of regular exercise and healthy eating habits to people in the modern world who have difficulty maintaining CR.
Purpose The aim of this study was to investigate the effects of treadmill exercise on mitochondrial quality control in the APP/sw transgenic mice model of Alzheimer's disease(AD). Methods The experimental mice were divided into non-tg-control (NTC, n=10), tg-control (TC, n=10), and tg-exercise (TE, n=10), and treadmill exercise was conducted for 12 weeks (15m/min, 60min, 5 times/week). And then, we measured the cognitive function using MWM and the brain cortex was evaluated to determine whether any changes in the oligomer Aβ, apoptotic-related factors, mitophagy and mitochondrial biogenesis. Results As a result, treadmill exercise significantly reduced oligomer amyloid and also had a positive effect on proteins (PUMA, Bax, Bcl-2) associated with apoptosis. In addition, through the treadmill exercise, PINK-1 decreased, and increased parkin, showing that active inhibition of mitophagy has been partially relaxed. It has been confirmed that the key autophagy markers LC3 and p62 significantly reduce p62 expression in TE group compared to TC group, and that LC3-II/LC3-I ratio tended to decrease, although not significant, increasing the activity of mitophagy. Next, proteins related to mitochondrial biosynthesis (SIRT-1, PGC-1α, Tfam, and COX-IV) have been identified, and the treadmill exercise has confirmed that the expression of all proteins has increased in part. Finally, cognitive has been shown to improve cognitive by shortening both swimming distance and time through treadmill exercise. Conclusions Thus, our finding suggested treadmill exercise alleviates cognitive dysfunction by improving mitochondrial quality control(mitophagy, mitochondrial biogenesis) and neuronal cell death via reducing amyloid accumulation, which may play a role in a preventive strategy for AD.
Purpose This study is to investigate the human rights violations of Semi-professional team athletes. Methods The subjects of the survey were 4,069 people in total of 56 sports athletes from teams. than, 1,251 athletes who agreed to provide personal information (635 males and 616 females) were sampled. The survey tool consisted of a total of 76 questions asking about violence, sexual violence, and general characteristics of semi-professional athletes. Results were frequency analysis, cross-analysis, and multiple response analysis. Results Despite being an adult athlete in the semi-professional Team's Workplace Sports Team, life controls were severe in the sports team and human rights violations, such as verbal and physical violence, were widely observed, and sexual harassment and sexual violence were not small. The main perpetrators were the leaders and senior players, and the venue was the training ground. The players were in an environment where they were forced to respond passively for fear of hierarchical, collective atmosphere and personal disadvantages, and were blind spots for labor rights in terms of contracts and treatment. Conclusion To human rights violations of semi-professional athletes as the structural problems of the Korean sports. It is necessary to strengthen human rights education by the workplace movement department and conduct regular human rights surveys, and legal institutionalization to establish a disciplinary information system for perpetrators. In addition, by enacting guidelines for human rights in the sports world, a system should be prepared so that the victims can actively express their intentions.
Purpose The purpose of this study was to examine the relationship among burnout, presenteeism, and coaching achievement perceived by athlete coaches in the sport field, and to identify the mediating effect of the presenteeism on the relationship between burnout and coaching achievement. Methods For this purpose, data were collected from 151 athlete coaches in South Korea through the survey. Measurement tools consisted of questionnaires on the coach’ burnout and presenteeism (SPS-13) that were designed in line with the research purpose. Collected data were analyzed using reliability testing, descriptive statistics, correlation analysis and simple mediation effect test. Results First, burnout level perceived by coaches was positively related to presenteeism, and not associated with coaching achievement. And presenteeism negatively correlated with coaching achievement. Second, the burnout level of the coach was negatively related to the coaching achievement through the presenteeism, the mediating variable. Conclusions Burnout of the athletes' coaches in the sports field has been confirmed to decrease the coaching achievement by increasing the presentations which is the work impairment due to their health problems.
Purpose The present study explored biological autonomy and control of function in circumstances that assessed a presumed relationship to an environmental cycle. An understanding of this behavior appeals to the organism-environment system rather than simply the organism—we seek to expose the laws that underlie end-directed capabilities by measuring biological characteristics (motor synchrony) in an environmental cycle (circadian temperature). Methods Participants (n = 24) at the University of Connecticut (Storrs, USA) and the Seoul National University (Seoul, Korea) served in the study. The production of in-phase bi-manual coordination was examined at different circadian points (allowing comparison of day-night temperature effects) in two experimental designs; (1) normal temperature embedded in a 24 hour cycle (5:00, 12:00, 17:00, and 24:00), and (2) normal versus abnormal temperature [artificially decreasing or increasing] while embedded at two points (5:00 am, 5:00 pm) during the circadian process. A typical bi-manual stability measure varied significantly as a function of the day-night temperature cycle. Results While (i) circadian effects under the artificially perturbed temperature manipulation were not straightforward along the day-night temperature cycle, (ii) the circadian effect divided by the ordinary circadian seems to be constant along the day-night temperature cycle. Conclusions The discovery of direct and robust relation between biological aspects (body temperature and motor synchrony) an environmental process (circadian temperature cycle) may echo adaptation of our biological system to the environment. This relation supports the claim that the organism and the environment should be considered as integrated system in which biological (or physical) dynamics takes place as a mutual factor.
Purpose The purpose of this study was to compare the technique and power of the Korean national athletes and international athletes in the start phase of the 500 m speed skating to improve the performance and to understand the relationship between the biomechanical variables affecting the record. Method The subjects were 8 Korean national athletes (Korean athletes) and 6 international athletes (international athletes). For the three dimensional motion analysis, 5 high-speed cameras were used to capture the 40 m start phase of the athletes participating in the international competition. The variables selected for analysis were the kinematic chain, 100 m net time, time to 9 strokes, horizontal position of center of mass after 2.5 sec, range of motion of trunk, knee, push-off angle, net power output, total power loss. Results The correct kinematic chain ratio of Korean athletes was 61.2%, which was lower than 76.0% of international athletes. The time to 9 strokes was 2.82±0.25 sec for Korean athletes, which was significantly lower than 2.53±0.11 sec for international athletes (p=.001). The range of motion of the push-off angle was 60.15±2.75° for Korean athletes, which was significantly lower than 64.76±2.55° for international athletes (p=.001). The net power output was 887.2±269.9 W for Korean players and 1103±264.1 W for international players (p=.021). The variables related to the 100 m net time were the horizontal position of center of mass after 2.5 sec (r=-.956, p=.001), the net power output (r=-.931, p=.001), and the total power loss (r=-.904, p=.001). Conclusion In order to improve the start performance of Korean athletes, it is necessary to maximize the efficiency of skating through skill training to use the correct kinematic chain. Also power enhancement training is needed to improve leg power because the net power output related with 100 m net time.
Purpose The purpose of this study was to examine athletes’ psychological competition experiences. Methods For this study, 64 student athletes, attending universities located in Seoul and Chungcheongbuk-do, participated in the study by completing an unconstructed questionnaire. The data were analysed through content analysis method. Results As a result, 15 themes, such as morale loss, comparable performance levels, opponent irritation were collected and the themes were classified into three categories including objectives of psychological competition, requirements of psychological competition, and psychological battle. In match situations, athletes attempt to psychologically compete in order to achieve objectives such as opponent’s morale loss, induce carelessness, trigger agitation and anger, dispersion of attention, and distraction. Psychological competition among rivals is valid when the requirements, such as comparable performance levels, sensitivity to match situations, strong tenacity and confidence, understanding of opponent and oneself, mutual checks and balances, are met. Athletes attack and defend to win the psychological competition by utilizing opponents irritation, information distortion, unexpected behaviors, predicting and coping, pulling a poker face, exclusion of opponents, and self-focusing. Conclusion This study created a theoretical foundation for a profound understanding of athletes’ psychological competition, which is often found in sport fields. Furthermore, this study is meaningful in that it has raised a chance of interest concerning psychological interaction between players in match situations.
Purpose This study was to examine the effect of athletes’ personality on coach-athlete maintenance of relationship. Methods For this purpose, the data was collected by 284 athletes using personality five factor questionnaire and Coach-Athlete Relationship Maintenance Questionnaire(CARM-Q). correlation and multiple regression analysis were conducted to verify the relationship between five personality factors and maintaining coach-athlete relationship. Results The results were as follows: Personality had a significant effect on the maintenance of coach-athlete’s relationship. Firstly, the artificial neural network was analyzed to find the influence of personality that determine positive relationships with coaches. Conclusion As a result, it was confirmed that the favor was the main discriminant factor in maintaining the relationship of coach-athlete. Finally, openness and sincerity were found to maintain and develop the positive relationship with coaches.
The purpose of this study was to evaluate the physical performance and develop the criteria of 4243 middle and high school students across 5 provinces (Busan, Gwangju, Daejeon, Gyeongi and Jeonbuk) in Korea that took part in the talent development project. The data was collected between 2011 and 2014. The criteria was divided by gender and age across different grades, and the mean, standard deviation and 5 evaluation levels were calculated and analyzed.
