Tracking systems have revolutionized the analysis of physical demands in professional soccer. Monitoring external load parameters through global positioning systems is crucial for monitoring fatigue, technical-tactical factors, and preventing injuries, especially during disruptions such as COVID-19 and midseason tournaments.

The gold standard for measuring hip and knee strength is isokinetic dynamometry. This study evaluated the reliability and concurrent validity of a handheld dynamometer (HHD) and a externally fixated dynamometer (ForceFrame [FF]) against isokinetic dynamometry, considering their practicality, cost-effectiveness, and ease of use in clinical practice.

Preseason training plays a pivotal role in preparing athletes for the competitive season and reducing the risk of hamstring strain injuries (HSI). This study evaluated the protective effect of preseason running workload on the risk of in-season HSI in elite soccer players.

Adolescent sport culture is moving away from multisport participation, emphasizing sport specialization for improved skill development despite concern of injury. This study examined biomechanical differences among low-, moderate-, and high-level specialized pitchers.

The latissimus dorsi (LD) comprises 2 neuromuscular regions-the thoracic and lumbar-pelvic-costal (LPC)-that may exhibit distinct activation patterns during shoulder and trunk exercises. A detailed understanding of these regional differences is crucial for optimizing therapeutic interventions due to their potential impact on muscle imbalances and rehabilitation outcomes in people with musculoskeletal conditions.

The force-velocity profile (FVP) is essential for understanding sprint performance, capturing parameters such as maximum theoretical force (F), maximum theoretical velocity (V), and power (P). Effective horizontal force application, especially during acceleration, enhances sprinting outcomes. Resisted sprint training (RST) using varied loads (light, moderate, heavy) can improve neuromuscular adaptations, sprint mechanics, and sport-specific performance. This study explores the effects of RST with different load magnitudes.

The level of interlimb asymmetry varies significantly across outcome measures, resulting in poor agreement in categorizing participants as (a)symmetric. Several researchers have discussed the need for an individual approach to data analysis and the need to perform multiple tests.

Anterior cruciate ligament (ACL) reconstruction guidelines recommend delaying return to sport until 9 months postsurgery and using functional testing to inform clinical decision-making.

Early sports participation can provide significant physical, psychosocial, and mental benefits for young athletes. Sports engagement can be via sport sampling or sport specialization. Sport specialization is often encouraged by parents and coaches as it is perceived as a mechanism for achieving elite level play, particularly in tennis.

Walkovers (WOs) and Defaults are significant occurrences in professional tennis, leading to uncompleted matches. WOs typically result from injuries, illnesses, or unforeseen circumstances, while Defaults stem from code of conduct violations. Understanding their epidemiology is essential for optimizing competition structure and injury prevention strategies.

Subjective patient-reported outcome measures (PROMs) and physical performance tests are important tools for assessing rehabilitation after anterior cruciate ligament reconstruction (ACLR). However, the associations and interrelationships between PROMs and dual-task jump performance, and sex-specific differences among patients with ACLR remain unclear.

Tennis players frequently use motor imagery (MI) to improve serve accuracy and efficiency. Moreover, breathing, such as forced expiration, can improve serving speed.

Preoperative and postoperative strength training is beneficial for outcomes of total knee arthroplasty (TKA). However, the effect of high-intensity strength training is not well understood.

Wearable technology shows promise for monitoring exertional sweat loss, yet its accuracy requires evaluation. This study evaluated the accuracy of 2 commercially available smartwatches for estimating sweat loss compared with gold standard methods.

For competitive adolescent athletes, injury avoidance is a challenge, and causes of injury are complex and multifactorial. Despite an incidence of 8.2 shoulder injuries per 1,000 hours of tennis played, few studies have investigated the association between shoulder strength, range of motion (ROM), and injury.

Sleep is vital for an athlete's recovery, physical and mental health, and athletic performance. The impact on circadian rhythm from long-distance travel across multiple time zones has not been studied using wearable technology in female professional tennis players.

High-intensity exercises, such as CrossFit (CF), may increase risk of pelvic organ prolapse (POP) due to pelvic floor muscle (PFM) overload.

The isokinetic dynamometer is the "gold standard" equipment for assessing muscle strength after anterior cruciate ligament reconstruction (ACLR); however, its high cost limits its use in clinical practice. The hand-held dynamometer (HHD) and performance-based tests are alternative methods.

The Star Excursion Balance Test (SEBT) is recognized for simultaneously assessing strength, range of motion (ROM), balance, neuromuscular control, and functional performance of the lower extremity. Although there is evidence to support the SEBT, a contemporary systematic review to define its clinically relevant psychometric properties is needed.

Upper extremity physical performance tests are used frequently to assess upper limb performance in overhead athletes such as tennis players. Recently, it has been suggested that a test battery rather than individual tests should be used to increase construct validity. So far, no test battery consisting of analytical tests, as well as physical performance tests, has been validated in a population of adult tennis players, correlating results with serve performance.

Injury prevalence among adult recreational tennis players may be >50%, involving injuries to upper extremity, lower extremity, and trunk. No standardized on-court warm-up/cool-down program has demonstrated improved compliance and injury reduction in this population.