# Special Issue \"Advances in Performance Analysis and Technology in Sports\"
## 3 Overview of the Contributions
In the fifth article, [PERSON] and [PERSON] investigate the \"Effects of Short-Rest Interval Time on Resisted Sprint Performance and Sprint Mechanical Variables in Elite Youth Soccer Players\". Using a randomized crossover design, the authors compared two sprint training protocols--one with traditional 2 min rest intervals (RST2M) and the other with shortened 40 s intervals (RST40s)--involving six 20 m resisted sprints with a 30% velocity decrement load. Despite expectations, there were no statistically significant differences in sprint performance, mechanical variables, or fatigue indices between the two protocols. These findings suggest that elite youth players may maintain sprint quality even under shorter recovery durations, challenging traditional assumptions in sprint training periodization. The study introduces a novel training approach that may offer greater efficiency without compromising sprint mechanics or inducing excessive fatigue, holding practical implications for conditioning coaches in soccer and similar team sports [9]. In the sixth contribution, [PERSON] and [PERSON] present a comparative study titled \"Comparative Analysis of Energy System Demands and Performance Metrics in Professional Soccer Players: Running vs. Cycling Repeated Sprint Tests\". This investigation aimed to assess the physiological and performance responses of professional soccer players during repeated sprint efforts using both running and cycling modalities. The results revealed that running-based sprints elicited significantly greater total energy expenditure, ATP-PCr system contribution, and energy demand, despite cycling producing higher peak and mean power outputs. Interestingly, the performance variables between modalities were not strongly correlated, suggesting that cycling and running sprint tests cannot be used interchangeably for assessing repeated sprint ability in field sports. The study offers critical insights into test modality selection for performance diagnostics, emphasizing the importance of sport-specificity when evaluating high-intensity intermittent exercise capacity [10]. The seventh article, authored by [PERSON] et al., is titled \"The Impact of Coordination Training on Psychomotor Abilities in Adolescent Handball Players: A Randomized Controlled Trial\". This study explored the long-term effects of an eight-month coordination training program on a range of psychomotor skills among male adolescent handball players. Using a randomized controlled design with pre-, mid-, and post-intervention assessments, the experimental group demonstrated statistically significant improvements in simple reaction time, visual-motor coordination, spatial orientation, divided attention, and perception orientation compared to a control group following standard training. The program incorporated a diverse array of coordination-focused exercises integrated into regular training sessions, emphasizing variability and progressive difficulty. The findings highlight the effectiveness of targeted coordination training in enhancing key cognitive-motor attributes in youth athletes and support its inclusion in developmental training programs for handball and other team sports [11]. The eighth article, \"Kinematic Characteristics of the Non-Throwing Arm During the Completion Phase of the Glide Shot Put in Elite Female Athletes: A Case Study\" by [PERSON] et al., provides a biomechanical exploration of a rarely analyzed component in shot put technique--the non-throwing arm. Using three-dimensional motion capture during a national-level competition, the study focused on the displacement, velocity, and angular motion of the non-throwing arm in a world-class female shot-putter. The results demonstrated that joint velocities and angular changes in the non-throwing arm were significantly correlated with performance indicators such as shot velocity and center of mass displacement.