The aim of this study was to compare isokinetic strength performance profiles in elite soccer players across different field positions. A total of 111 elite international players of Polish Ekstraklasa (the top division in Poland) were examined during the 2010-2015 seasons. The players were classified into six positional roles: central defenders (CD), external defenders (ED), central midfielders...

BACKGROUND Some research studies have investigated the effects of anterior cruciate ligament (ACL) injury prevention programs on knee kinematics during landing tasks; however the results were different among the studies. Even though tibial rotation is usually observed at the time of ACL injury, the effects of training programs for knee kinematics in the horizontal plane have not yet been analyz...

OBJECTIVES To identify the intrinsic risk factors of non-contact strains in the hamstrings and quadriceps muscles of professional soccer players via a cohort prospective design. METHODS A total of 100 professional soccer players (aged 19.4-27.8 years) from four professional teams underwent a composite musculoskeletal assessment at preseason. Intrinsic risk factors included dichotomies of asym...

Non-local muscle fatigue (NLMF) has been attributed to both physical and mental fatigue. The purpose of this study was investigate the effects exertion versus unilateral on NLMF. Sixteen recreationally active participants completed a task (2-sets 100-s knee extension (KE) maximal voluntary isometric contractions (MVIC) with dominant leg 40-s recovery between sets, (4-minute Stroop task), contro...

Many different autografts are available for anterior cruciate ligament reconstruction. Although patellar tendon graft and hamstrings most commonly used, quadriceps with or without a bone plug is gaining popularity. Preliminary evidence suggests that quad performs at least as well plug, although more comparative information needed. In the meantime, surgeons should strive to gain experience multi...

Several techniques are available to assess muscle tissue status, including electrical impedance myography (EIM). Despite being used in the assessment of neuromuscular status injury and response exercise, reliability data for hamstrings muscles limited. Therefore, this study aimed determine test-retest EIM components on hamstrings. Twenty-one healthy males (25.3 ± 3.4 years; 173 6.7 cm; 79.7 15....

CONTEXT Epidemiologic findings of higher incidences of hamstrings muscle strains during the latter stages of soccer match play have been attributed to fatigue. OBJECTIVE To investigate the influence of soccer-specific fatigue on the peak eccentric torque of the knee flexor muscles. DESIGN Descriptive laboratory study. SETTING Controlled laboratory environment. PATIENTS OR OTHER PARTICIP...

A simulation based on a forward dynamical musculoskeletal model was computed from an optimal control algorithm to understand uni- and bi-articular muscle coordination of maximum-speed startup pedaling. The muscle excitations, pedal reaction forces, and crank and pedal kinematics of the simulation agreed with measurements from subjects. Over the crank cycle, uniarticular hip and knee extensor mu...

BACKGROUND Rupture of the proximal origin of the hamstrings leads to pain, weakness, and a debilitating decrease in physical activity. Repair of these injuries should be based on the expectation that these deficits can be addressed. The goal of this study was to objectively evaluate the efficacy of repair of proximal hamstring avulsions. METHODS Thirty-four patients were identified retrospect...