Anterior cruciate ligament (ACL) injuries are common in soccer. Understanding ACL loading mechanisms and risk factors for injury is critical designing effective prevention programs. The purpose of this review to summarize the relevant literature on mechanisms, factors, current programs soccer players. Literature has shown that tibial anterior translation due shear force at proximal end tibia primary mechanism. No evidence been found showing knee valgus moment largely ignored previous studies...

Background: Anterior cruciate ligament injuries (ACL) commonly occur during jump landing and cutting tasks. Attempts to land softly with greater knee flexion are associated decreased ACL loading. However, their effects on performance unclear. Hypothesis: will decrease peak posterior ground-reaction force (PPGRF) extension moment at PPGRF compared a natural stop-jump side-cutting initial ground contact increase both In addition, techniques stance time lower extremity mechanical work as well...

Asymmetries in sagittal plane knee kinetics have been identified as a risk factor for anterior cruciate ligament ( ACL ) re‐injury. Clinical tools are needed to identify the asymmetries. This study examined relationships between kinetic asymmetries and ground reaction force GRF during athletic tasks adolescent patients following reconstruction ACL‐R ). Kinematic data were collected stop‐jump task side‐cutting 23 patients. Asymmetry indices surgical non‐surgical limbs calculated variables....

The functional movement screen is developed to examine individuals' patterns through 7 tasks. purpose of this study was identify the internal consistency and factor structure tasks in elite athletes; 290 athletes from a variety Chinese national teams were assessed using screen. Cronbach's alpha calculated for scores Exploratory analysis performed explore mean standard deviation sum score 15.2 ± 3.0. A low (0.58) found extracted 2 factors with eigenvalues greater than 1, these explained 47.3%...

Anterior cruciate ligament (ACL) injuries commonly occur during the early phase of landing and cutting tasks that involve sudden decelerations. The purpose this study was to investigate effects jump height speed on lower extremity biomechanics a stop-jump task effect side-cutting task.Thirty-six recreational athletes performed under 3 conditions: jumping fast, for maximum height, 60% height. Participants also 2 at speed. Three-dimensional kinematic kinetic data were collected.The fast...

Landing and squat tasks have been utilized to assess lower extremity biomechanics associated with anterior cruciate ligament loading injury risks. The purpose of this study was identify the differences correlations in knee hip mechanics during a single-leg landing, squat, double-leg squat. Seventeen male 17 female recreational athletes performed landings squats when kinematic kinetic data were collected. ANOVAs showed significant (p < 0.00001) for maximum flexion angles, abduction adduction...

Anterior cruciate ligament (ACL) injuries commonly occur during jump-landing tasks when individuals' attention is simultaneously allocated to other objects and tasks. The purpose of the current study was investigate effect allocation imposed by a secondary cognitive task on landing mechanics jump performance. Thirty-eight recreational athletes performed in three conditions: no counting, counting backward 1 s from randomly given number, 7 number. Three-dimensional kinematics ground reaction...

Quantification of asymmetries between the two limbs is informative in assessing risk injury and performance deficits, but there a paucity studies investigating effects age sex on bilateral asymmetry young soccer players. This cross-sectional study aimed to investigate strength dynamic balance 7- 24-year-old players United States. A total 174 participated (Age 7–9 years: 26 females 16 males; Age 10–12 32 31 13–17 17 25 &amp;gt;18 13 14 males). Jump displacement, peak force, during...

The aim of this study was to investigate the relationships between knee and ankle strength horizontal deceleration performance following different sprint distances. Fifty-seven (n = 41male, n 16 female) youth team-sports athletes completed: a) 5-m 10-m ability (HDA) tests; b) concentric (60°/s, 180°/s) eccentric (30°/s) relative peak torque (PT) measurements extensor (KE) flexor (KF) muscles plantarflexion (APF) dorsiflexion (ADF) in an isokinetic dynamometer. Pearson's correlation...

ABSTRACT Trunk perturbation before initial ground contact (IC) is associated with increased anterior cruciate ligament (ACL) injury risk. The purpose of this study was to determine the effect midflight and posterior pulling applied upper trunk on ACL loading variables during landings. Participants performed double‐leg vertical jumps without or perturbation. created by a customized device, participants through freely dropping slam ball IC. Whole‐body kinematics reaction forces were collected...

Background: Anterior cruciate ligament (ACL) reinjury rates are high in adolescent patients. Knee braces commonly used after ACL reconstruction to prevent during return sports. Hypothesis: Adolescent patients following injury would demonstrate a decreased vertical ground-reaction force, knee extension moment, flexion angle, and velocity on the surgical limb when compared with nonsurgical side-cutting task. A functional extension–resistant brace decrease asymmetries. Study Design: Controlled...

The purpose of this study was to understand the mechanism an anterior cruciate ligament (ACL) injury in javelin throwing and techniques relevant ACL injury. patient elite female thrower who completed first three trials sustained a non-contact on her left knee fourth trial during recent track field meet. Three-dimensional kinematic data were collected non-injury trials. 52 male 54 throwers obtained from biomechanical database. had greater forward center mass velocity less vertical after 25%...

Dai, B, Layer, J, Vertz, C, Hinshaw, T, Cook, R, Li, Y, and Sha, Z. Baseline assessments of strength balance performance bilateral asymmetries in collegiate athletes. J Strength Cond Res 33(11): 3015-3029, 2019-Injuries to upper lower extremities comprise more than 70% the total injuries Establishing normative data extremity may help guide postinjury rehabilitation return-to-play decisions. The purposes current study were develop during 4 tests athletes quantify correlations between...

The peer review process of original research articles generally requires authors/researchers to adopt accepted scientific methods, identify testable hypotheses and test those using appro...

AbstractSudden unexpected loading has been identified as a risk factor of work-related low back pain (LBP). This study investigated the effects different foot placements and load-releasing locations on trunk biomechanics under an sudden event. Fifteen subjects experienced release 6.8-kg external load from symmetric or asymmetric directions while maintaining four placements. The results showed that average 4.1° less flexion, 6.6 Nm L5/S1 joint moment 32.0 N shear force with staggered stance...

Stephenson, ML, Smith, DT, Heinbaugh, EM, Moynes, RC, Rockey, SS, Thomas, JJ, and Dai, B. Total lower extremity lean mass percentage positively correlates with jump performance. J Strength Cond Res 29(8): 2167–2175, 2015—Strength power have been identified as valuable components in both athletic performance daily function. A major component of strength is the muscle mass, which can be assessed dual-energy x-ray absorptiometry (DXA). The primary purpose this study was to quantify relationship...

The purpose was to quantify the effects of mid-flight whole-body and trunk rotation on knee mechanics in a double-leg landing. Eighteen male 20 female participants completed jump-landing-jump task five conditions: no rotation, testing leg ipsilateral or contralateral (WBRC) direction, (TRI) direction. WBRC TRI conditions demonstrated decreased flexion increased abduction angles at initial contact (2.6 > Cohen's dz 0.3) peak vertical ground reaction forces adduction moments during 100 ms...

Background: Anterior cruciate ligament (ACL) reconstruction is associated with a high incidence of second tears (graft and contralateral ACL tears). These secondary have been attributed to asymmetrical lower extremity mechanics. Knee bracing one potential intervention that can be used during rehabilitation has the normalize asymmetry; however, little known about effect on movement asymmetry in patients following reconstruction. Hypothesis: Wearing knee brace would increase joint flexion...