|Changes in the mechanical and electromyographic output during isotonic and isometric exercise in men and women
||Purpose: The purpose of this study was to determine if surface electromyography (EMG) could be used to index fatigue during isotonic and maximal voluntary isometric contractions (MVIC) of the knee extensors in men and women.
Methods: Ten males (age ...
|Cyclic variations in multiplanar knee laxity influence landing biomechanics.
||Purpose: Females vary substantially in their multiplanar cyclic knee laxity changes across the menstrual cycle. The biomechanical implications of these cyclic changes are relatively unknown. Our purpose was to first cluster females based on their cyc...
|Dynamic Valgus Alignment and Functional Strength in Males and Females During Maturation
||Context: Sex differences in dynamic measures have been established in physically mature populations. Gaining information on maturation's effect on dynamic performance measures implicated in injury risk may enable us to better design injury prevention...
|Effect of axial load on anterior tibial translation when transitioning from non-weight bearing to weight bearing
While the application of compressive joint loads and thigh muscle activity are associated with anterior tibial translation in vitro, less is known during early load acceptance in vivo. We investigated the effects of increasing axial loads...
|Effects of Transverse and Frontal Plane Knee Laxity on Hip and Knee Neuromechanics During Drop Landings
||Background Varus-valgus (LAXVV) and internal-external (LAXIER) rotational knee laxity have received attention as potential contributing factors in anterior cruciate ligament injury. This study compared persons with above-and bel...
|Energy absorption as a predictor of leg impedance in highly trained females
||Although leg spring stiffness represents active muscular recruitment of the lower extremity during dynamic tasks such as hopping and running, the joint-specific characteristics comprising the damping portion of this measure, leg impedance, are uncert...
|Helmet fit and cervical spine motion in collegiate men’s lacrosse athletes secured to a spine board.
||Context: Proper management of cervical spine injuries in men's lacrosse players depends in part upon the ability of the helmet to immobilize the head.
Objective: To determine if properly and improperly fitted lacrosse helmets provide adequate stab...
|Joint Laxity Is Related to Lower Extremity Energetics during a Drop Jump Landing
||Purpose: To examine the relationships between anterior knee laxity (AKL), genu recurvatum (GR), and general joint laxity (GJL) with sagittal plane energetics in males and females during a drop jump task. Methods: A total of 68 females and 50 males we...
|Kinematic analysis of functional lower extremity perturbations
||Background. Sudden changes in direction on a single weight-bearing-limb are commonly associated with injury to the lower extremity. The purposes of this study were to assess the between day reliability of hip, knee, and ankle kinematic displacements ...
|Knee Joint Laxity and Its Cyclic Variation Influence Tibiofemoral Motion during Weight Acceptance
||Purpose - To better understand how sex differences in anterior knee joint laxity (AKL) impact knee joint biomechanics, we examined the consequence of greater absolute baseline (males and females) and cyclic increases in AKL during the menstrual cycle...
|Low levels of anterior tibial loading enhance knee extensor reflex response characteristics
||We examined whether neuromuscular reflexes were altered with anterior loads applied to the tibiofemoral joint. A ligament testing device was modified by attaching a reflex hammer to a steel mounted frame to illicit a patellar tendon tap, while anteri...
|Research Retreat IV: ACL Injuries–The Gender Bias, April 3-5, 2008, Greensboro, NC
||In April 2008, more than 80 attendees from across the United States and Canada participated in the fourth research retreat focused on the gender bias in anterior cruciate ligament (ACL) injury. The retreat was cofounded by Irene Davis, PhD, PT, and M...
|Sex Differences in Coupled Knee Motions during the Transition from Non-Weight Bearing to Weight Bearing
||Knee ligament injuries frequently happen when the joint transitions from non-weight bearing (NWB) to weight bearing (WB). To gain insight into the mechanism that produces these injuries, physically active females (N = 41) and males (N = 39) underwent...
|Sex differences in lower extremity biomechanics during single leg landings
||Background. Females have an increased incident rate of anterior cruciate ligament tears compared to males. Biomechanical strategies to decelerate the body in the vertical direction have been implicated as a contributing cause. This study determined i...
|Sex specific abdominal activation strategies during landing
||Control of the trunk segment in landing has been implicated as a contributing factor to the higher incidence of anterior cruciate ligament injuries in females than in males. Investigating the sex-specific abdominal activation strategies during landin...
|Thigh Strength and Activation as Predictors of Knee Biomechanics during a Drop Jump Task
||Purpose: To examine whether normalized quadriceps and hamstring strength would predict quadriceps and hamstring muscle activation amplitudes and whether these neuromuscular factors would predict knee kinematics and kinetics during a drop jump task. M...
|Variations in Varus/Valgus and Internal/External Rotational Knee Laxity and Stiffness Across the Menstrual Cycle
||Cyclic variations in genu recurvatum (GR), general joint laxity (GJL), varus–valgus (VV), and internal–external (IER) rotational laxities and stiffnesses were examined in 64 females and 43 males at two time points during the females' menstrual cycle ...