Background and objectiveTo analyze the body composition, anaerobic power, and fatigue in high school soccer players resulting from very short-term, high-intensity interval training (HIIT) for 3 weeks during off season. MethodsForty-four high school soccer players, with a mean age of 17.2 ± 1.0 years, were included in the study. The sample consisted of a single group, and the tests measured body composition using the impedance method, anaerobic power using a Wingate cycle ergometer, and strength with an isokinetic device. The training was carried out 5 days/week over a 3-week period for a total of 15 sessions. Training included stretching and warming up, sprint anaerobic cycle training, and running HIIT such as sidestep, zigzag run, ladder run, box jump, and plyometrics. ResultsPost-training muscle mass (+2.0%, p < 0.001) and fat ratio (−12.7%, p < 0.001) improved significantly compared to pre-training observations. However, bodyweight and body mass index (BMI) did not change significantly. The Wingate test, measuring peak power in three and five sets showed greater improvement compared to the initial test (+10.7% and +19.0% respectively). A significant decrease was observed for fatigue in three and five sets (−8.5% and −12.4% respectively). The isokinetic strength test showed significant differences in flexion(+8.5%, p = 0.002) and extension (+9.4%, p < 0.001) at 60°/s.

BackgroundCardiac rehabilitation programs reduce the likelihood of relapse and cardiac arrest in patients with cor-onary artery disease. The goal of this study was to compare and analyze changes in cardiovascular risk factors and physical fitness in patients who participated in short-term (ST) and long-term (LT) cardiac rehabilitation programs following coronary artery percutaneous coronary intervention (PCI). MethodsThis study included 193 men aged ≥45 years who received PCI for coronary artery occlusive disease. The participants were divided into ST program participants (3 months, 108 participants; ST group) and LT program participants (12 months, 85 participants; LT group). Blood lipids analysis, body composition, and physical fitness tests were performed to assess cardiovascular risk factors and physical fitness. Paired t-test and two-way ANOVA with repeated measures were used to investigate the effect of the intervention. ResultsBoth groups had significant improvements after cardiac rehabilitation in body fat, high-density lipoprotein cholesterol, exercise duration, heart rate (HR) at rest, double product peak, VO2 peak, 6-min walking, and sit-to-stand, compared to baseline. The LT group also had significant improvements after cardiac rehabili-tation in waist circumference (WC), total cholesterol (TC), triglyceride (TG), and HR peak. LT group had significantly improved effect than ST group in WC, TC, TG, exercise time, HR peak, and 6-min walking. ConclusionThe cardiac rehabilitation program led to improved cardiovascular risk factors and physical fitness, and the LT program was more effective than the ST program.