Purpose The purpose of the study was to determine difference of body composition, bone mineral density and health-related fitness by physical activity level in young women. Methods A total of 90 women aged 19-29 years participated in this study. The subjects were divided into three groups (low, middle, and high level) according to the physical activity level estimated by bone-specific physical activity questionnaire(BPAQ). Body height and weight were measured. Body composition parameters including four sites of bone mineral density(BMD) were estimated by DXA (Hologic, QDR-4500, USA). Health-related fitness tests was assessed using sit & reach, grip strength, sit-ups, and VO2max. Statistical analysis was performed using SAS version 9.4. All data were presented in terms of means and standard deviations. One-way ANOVA was applied to determine difference of dependent variables by physical activity level. Duncan's multiple range test was used as a post-hoc test. The statistical significance level was set at p < .05. Results There were significant differences on body weight(F = 4.867, p = .01), body mass index(F = 5.053, p = .008) and fat-free mass(F = 8.364, p = .0001) among the three groups. Significant differences were found on whole body BMD(F = 16.730, p = .0001), lumbar BMD(F = 11.480, p = .0001), femur BMD(F = 42.182, p = .0001) and forearm BMD(F = 5.560, p = .005) among the three groups. There were also significant differences on sit and reach(F = 11.433, p = .0001), sit-ups(F = 17.972, p = .0001), VO2max(F = 3.106, p = .05) and duration of GXT(F = 7.479, p = .001). Conclusions There were differences on body composition, bone mineral density and health-related physical fitness by physical activity levels. Nevertheless, the questionnaire used in this study was not able to judge participation in various exercise types including aerobic exercise or resistance exercise. Therefore, in the future study, longitudinal study considering various types of physical activity and dietary intake will be needed.
Purpose The purpose of this study was to investigate the effect of a 10-week aerobic exercise training on cardiovascular function, atherosclerosis, and vascular endothelial function in elderly women. Methods Twenty impaired fasting glucose (IFG) and normoglycemic elderly women volunteered to participate in the study. The participants in aerobic exercise training group (TR: n=9) completed 20-40 minutes of aerobic exercise program at 30-50% HRR for 3 times per week during 10 weeks. The participants in control group (CON: n=11) were asked to maintain their normal life pattern during the same intervention period. Results Main results of the study were as follows: 1) There were no significant main effect or interaction in body weight, fat-free mass, fat mass, percent body fat, and body mass index. 2) There were no significant main effect or interaction in heart rate, stroke volume, cardiac output, total peripheral resistance (TPR), systolic blood pressure, diastolic blood pressure, mean arterial blood pressure, pulse pressure, and rate pressure product. However, interaction between group and test in TPR was close to statistically significant level (P =.054), and it tended to be decreased in TR group. 3) There was a significant main effect of test in high sensitivity C-reactive protein(hs-CRP), it tended to be decreased in TR group. There were no significant changes in total cholesterol(TC)/high density lipoprotein-cholesterol (HDL-C) ratio, triglyceride/HDL-C ratio, and low density lipoprotein-cholesterol/HDL-C ratio. 4) There were significant main effect of group, main effect of test, as well as interaction between group and test in % flow mediated dilation(FMD), and it increased significantly (P<.01) in TR group. Nitric oxide tended to be increased in TR group, even though it did not change significantly in both groups. Conclusions It was concluded that the 10-week aerobic exercise training would be beneficial for improvement of vascular endothelial function, resulting from the decrement of total peripheral resistance.
Purpose The present study was set up to investigate the effect of self-regulated learning and selection of feedback on learning of the relative and absolute timing. Methods 48 university student volunteers participated in the experiment and were randomly assigned four groups (n=12 for each) depending on practice task and feedback, namely: 1) self-regulated practice task - self-controlled feedback (self-self), 2) self-regulated practice task - york-controlled feedback (self-york), 3) york-regulated practice task - self-controlled feedback (york-self), and 4) york-regulated practice task - york-controlled feedback (york-york). The task was to examine the temporal timing error and the task goal was to press a computer keyboard 'J' and 'K' alternatively corresponding to time set. Prior to the experiment, the participants had a pre-practice session and then practiced one of three timing tasks provided by an experimenter in the acquisition phase. There were two transfer test to assess adaptability aspects of performing changes related to learning after 24 hours of the acquisition phase. Serial practice was applied in the transfer 1 and an effector transfer was examined in the transfer 2. The dependent variables were a relative timing error that is susceptible to discrepancy between the participant’s key press and the goal patterns and an absolute timing error that is susceptible to discrepancy in the time required to perform the sequence compared to the goal absolute time. Results The results showed that in the pre-test there was no significant difference in both the relative and absolute timing error across four groups. However, in acquisition phase there was a significant difference in both the relative and absolute timing error across block. The relative timing error was different across the group in the transfer test 1, however it was different only between the self-self and york-york group. Lastly, the absolute timing error was not different across the groups in the transfer test 2. Conclusion The findings revealed that the self-regulated strategy is effective to learn the relative timing in the effector transfer.
This study aimed to examine the change of the indices in blood gas, ions, and by-products of fatigue substances and components in collegiate elite Kumdo competitors, who carry out a number of competitive games during one day tournament event. Subjects were carried out total 6 simulated, but followed same conditions and rules of actual competition, with providing similar inter-game break time. Eight well trained male competitors, who had awarded from national wide competitions, voluntarily participated in this study and revealed 51.5(±8.8) mL·kg-1min-1 of maximal oxygen consumption and 12.4(±5.1) % body fat. TWOWAY ANOVA (tournament round vs. pre & post each game) was adopted to test whether the mean differences were existed, and the interaction between individual factors and main effect within each factors were analyzed. Statistical significance was set at Alpha (α) = .05. While there were no significant changes in blood hydrogen ion concentration (i.e., pH) and partial pressure of oxygen (PO2), partial pressure of carbon dioxide (PCO2) significantly decreased as the tournament games were repeated. The level of hemoglobin and hematocrit were significantly elevated only during the 1st round of tournament. Na+ was significantly increased but K+ was decreased. Ca2+ concentration however, was not significantly altered. Although the changes of blood glucose level did not show any consistent patterns, free fatty acid (FFA) concentration was increased after completed each game compared to prior to initiate the each game. Blood NH3, lactic acid, and uric acid concentration increased at immediately after each game, and the pattern was maintained throughout the tournament round continued. These results reflected that the repeated participation of the tournament may cause the accumulation of the by-products of fatigue substances in blood and alteration of various ion components and energy substrates. Accordingly, the ways of reducing the physical fatigue and providing adequate energy source inter-tournament games needs to be necessarily considered for successful Kumdo competition. Data obtained from this study could valuable for searching the effective training and management methods to improve the performance and reduce the fatigue of the professional elite Kumdo competitors.
PURPOSE This study investigated the effects of 12 weeks of clubbell and stepbox training on physical fitness, badminton skills, and fatigue in male badminton, grade A (top grade) club members aged 20–30s, with over 5 years’ experience. METHODS Participants in a training group (TR: n=15) engaged in 12 weeks of clubbell and stepbox circuit training involving maximum 8–12 reps of clubbell exercises and stepbox exercises at over 77% of HRmax for 50–55 min/sessions three times a week. Participants in a control group (CON: n=15) maintained their normal lifestyle pattern during the same intervention period. Dependent variables were measured and compared using repeated measures two-way ANOVA. RESULTS The main results were as follows: 1) The groups showed no significant differences in body composition. 2) Regarding physical fitness, VO2max, relative peak power, relative average power, grip strength, push ups, repeated jump squats, SSPT (seated single-arm shot-put test), 10 m sprint, and hexagon agility increased significantly in the TR, while push ups decreased significantly in the CON. 3) As for badminton skills, forehand clear accuracy, badminton agility, badminton endurance, and smash speed increased significantly in the TR. Forehand clear accuracy decreased significantly in the CON, but badminton agility and smash speed increased significantly. 4) The groups showed no significant differences in fatigue. CONCLUSIONS In male badminton club members aged 20–30s, 12 weeks of clubbell and stepbox circuit training effectively improved physical fitness and badminton skills. However, lack of any improvement in body composition and fatigue warranted further research in these areas.
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.
PURPOSE This study aimed to investigate the effects of continuous exercise and the accumulation of short-duration exercise for 12 weeks on body composition, physical fitness, and lifestyle disease indices in overweight men in their 30s. METHODS Participants in the continuous exercise group (CE; n=13) performed a circuit exercise program of 30 min/session, 3 sessions/week for 12 weeks. Participants in the accumulation of short duration exercise group (ASE; n=12) performed the same exercise time of 30 min per day, divided into three sessions of 10 min. Body composition, physical fitness, and lifestyle disease indices were measured pre- and post-test and were compared by utilizing a repeated two-way ANOVA. RESULTS 1) Regarding body composition, body weight, body mass index, skeletal muscle mass, waist circumference, and fat mass decreased significantly, while hip circumference increased significantly in the CE group. Waist circumference and skeletal muscle mass decreased significantly, while hip circumference increased significantly in the ASE group. 2) Regarding physical fitness, right grip strength, sit and reach, sit up, and maximal oxygen uptake increased significantly in both groups. 3) Regarding hypertension indices, there were no significant differences in both groups, but they showed a tendency to improve. 4) Regarding hyperlipidemia indices, triglycerides (TG) decreased significantly in both groups, and total cholesterol (TC) decreased significantly in the CE group. 5) Regarding diabetes indices, there were no significant differences in both groups, but a tendency to improve was noticed. 6) Regarding arteriosclerosis indices: TG/high density lipoprotein-cholesterol ratio decreased significantly in both groups, and the TC/high density lipoprotein-cholesterol ratio decreased significantly in the CE group. CONCLUSIONS We concluded that both the accumulation of short duration exercise and continuous exercise can be effective in improving body composition, physical fitness, and lifestyle disease in overweight men.
PURPOSE This study aimed to investigate the effect of an ankle strap on kinetic variables of the lower limb during forward jump landing. METHODS Twelve healthy adult men (mean age, 23.58±2.22 years; mean height, 177.83±5.37 cm; mean weight, 75.00±7.72 kg) participated. The participants stood barefoot on both legs at a horizontal distance of 40% of their body height from the center of the force plate, then jumped forward and landed on the force plate with their dominant or non-dominant leg over a 30-cm hurdle while wearing or not wearing an ankle strap. Joint angle, peak vertical force, loading rate, and leg stiffness were calculated. Paired t-test and repeated-measures two-way analysis of variance with Bonferroni’s post hoc tests were used to compare the characteristics of both lower limbs and the effect of wearing an ankle strap. The significance level was α < .05 RESULTS Our results showed significant differences in kinematic variables between the dominant and non-dominant legs without the ankle strap. With the ankle strap, the inversion angles at the ankle joints of both lower extremities were significantly decreased, and an interaction effect between both legs and the ankle strap occurred in the internal rotation angle of the ankle joint. Kinetic variables did not differ significantly. CONCLUSIONS The ankle strap did not completely compensate for ankle instability in the non-dominant leg, but it significantly reduced the angle of internal rotation at the ankle joint. Thus, we recommend that correct wearing of the ankle strap in sports since it reduces the possibility of lateral ankle sprains to some extent.
PURPOSE The main purpose of this study was to examine the difference in visual search strategies based on the skill level in success and failure cases in badminton short serves. METHODS To this end, six badminton experts (experience: more than 10 years) and six novices (less than 1 years) participated. The participants’ eye movement was recorded during each trial, and mean fixation duration, mean saccade amplitude, percentage of viewing time on each fixation location, final fixation duration, and gaze entropy were analyzed. RESULTS First, the mean fixation duration did not differ significantly, but the mean saccade amplitude increased when expert players failed to perform the serve successfully. Second, the percentage of viewing time on each location results showed that the overall viewing time was lower when the performance was unsuccessful, and the expert players fixated longer time viewing the net and space when they made a successful serve. Third, expert players showed longer QE than novice players when they made a successful serve. Finally, the gaze entropy results showed that expert players showed greater gaze entropy during successful performance, indicating that the gaze pattern was randomly distributed across trials. CONCLUSIONS When learning a badminton serve, we should fully recognize and explore the receiver’s location and external environment, and subsequently, before initiating serve movement, focus on the net or space between the receiver’s racquet and shoulders to make a more successful performance. In addition, we should make various patterns of the visual search strategy, rather than the fixed or consistent search strategy, to deceive receivers.
PURPOSE The purpose of this study was to develop a non-face-to-face self-regulation training program for middle and high school student-athletes through the conduct of a group online video counseling session, as well as to verify the effectiveness of such a tool. METHODS Based on the models of Zimmerman(2000) and Han Si-wan (2008), the 12-session non-face-to-face self-regulation training program consisting of interactions involving cognitive, emotional, and behavioral factors was developed and used on a 16-member experimental group. Additionally, self-regulation and mental toughness questionnaires were given to each member before and after the program, and the results were compared with the results of a 17-member control group. Since a qualitative evaluation was conducted, recorded training contents were organized into a text file; after which, a step-by-step coding procedure was performed, and then meanings and themes were identified and categorized. RESULTS Quantitative analysis found that the volitional inhibition mode of the control group decreased significantly; this was in comparison to the increase in the self-regulation mode of the experimental group. In addition, among the seven sub-factors of the mental strength test of the experimental group, a significant increase was found in the post-test of self-belief, attention control, emotional regulation, resilience, and optimism factors. As a result of qualitative data analysis, they complained of difficulties in the early stages of participation, but gradually recognized their problems and searched for changes, showed changes in cognition, emotion, and behavior as they approached the end of the study period. CONCLUSIONS It can be said that the non-face-to-face self-regulation training program helped student athletes improve their school life and performance by driving positive cognitive, emotional, and behavioral changes.
