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Natalie L. Myers, Guadalupe Mexicano and Kristin V. Aguilar

while trying to minimizing injury risk. Training workload can be measured a variety of different ways, assessing both external and internal workload parameters. Internal workload is an individual’s response to an external stimulus. 1 A common measure of internal workload is session rate of perceived

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Boyi Dai, Mitchell L. Stephenson, Samantha M. Ellis, Michael R. Donohue, Xiaopeng Ning and Qin Zhu

Increased knee flexion and decreased knee valgus angles and decreased impact ground reaction forces (GRF) are associated with decreased anterior cruciate ligament (ACL) loading during landing. The purpose of this study was to determine the effect of tactile feedback provided by a simple device on knee flexion and valgus angles and impact GRF during landing. Kinematic and kinetic data were collected when 28 participants performed baseline, training, and evaluation jump-landing trials. During the training trials, the device was placed on participants’ shanks so that participants received tactile feedback when they reached a peak knee flexion angle of a minimum of 100°. During the evaluation trials, participants were instructed to maintain the movement patterns as they learned from the training trials. Participants demonstrated significantly (P < .008) increased peak knee flexion angles, knee flexion range of motion during early landing (first 100 ms of landing) and stance time, decreased impact posterior and vertical GRF during early landing and jump height, and similar knee valgus angles during the evaluation trials compared with the baseline trials. Immediately following training with tactile feedback, participants demonstrated landing patterns associated with decreased ACL loading. This device may have advantages in application because it provides low-cost, independent, and real-time feedback.

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Robert Ahmun, Steve McCaig, Jamie Tallent, Sean Williams and Tim Gabbett

It is well established that injury rates can influence the success of a team, 1 and consequently, managing loads appears to be an essential part of reducing injury risk. Training loads comprise both internal and external loads. External load relates to the amount of work completed, while internal

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Lukas D. Linde, Jessica Archibald, Eve C. Lampert and John Z. Srbely

Consequently, greater hip adduction angle and knee abduction angle/moment during single-leg squats have been linked to increased ACL injury risk. Poor trunk control has also been recently associated with increased risk of ACL injury. 4 , 6 A large 3-year prospective study reported that decreased trunk control

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Chris Brogden, Kelly Marrin, Richard Page and Matt Greig

risk of injury incidence. 14 These theories are further supported by an increase in match play American Football (NFL) injuries that have been shown to correspond with match start times, which are nearer to endogenous biological troughs in alertness, thus accentuating fatigue and injury risk. 14

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Mahsa Jafari, Vahid Zolaktaf and Gholamali Ghasemi

14 is the cutoff score. 6 Scores lower than the cutoff indicate an increased relative injury risk; nevertheless scores higher than the cutoff do not indicate immunity from the risk. This is substantiated by several studies. For example, US service members who scored ≤14 were reported to be at about

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Patrick Ward, Aaron J. Coutts, Ricard Pruna and Alan McCall

and psychological characteristics. Each of these players requires individual catering—whether an injury risk profile, prevention strategy, treatment/rehabilitation, dietary regimen, recovery, or psychological intervention. It is hoped that this commentary will provide some insights into innovative

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Justin P. Waxman, Kevin R. Ford, Anh-Dung Nguyen and Jeffrey B. Taylor

Measures of lower-extremity stiffness continue to gain popularity in the biomechanics literature due to their reported associations with both athletic performance and lower-extremity injury risk. 1 , 2 For example, higher levels of lower-extremity stiffness have been shown to be predictive of

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Hayley M. Ericksen, Brian Pietrosimone, Phillip A. Gribble and Abbey C. Thomas

greater reductions in anterior cruciate ligament (ACL) injury risk compared with those that do not include feedback. 1 Various modes of feedback, including expert-provided feedback and self-analysis feedback, have been used to specifically reduce vertical ground reaction force and increase knee

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Nicola Marotta, Andrea Demeco, Gerardo de Scorpio, Angelo Indino, Teresa Iona and Antonio Ammendolia

in male and female athletes. 12 This study also aimed to determine onset muscle activity of thigh muscles during a drop landing task that puts stress on the ACL and to assess neuromotor involvement in ACL injury risk. Methods This study was in accordance with the Declaration of Helsinki; written