Influence of Anticipation and Motor-Motor Task Performance on Cutting Biomechanics in Healthy Men.

Context: Biomechanical analyses of cutting tasks have demonstrated kinematic differences associated with the noncontact knee-injury risk when the movement direction is unanticipated. Motor-motor dual tasks occur within dynamic environments and change the demand for attentional resources needed to complete athletic maneuvers, which may contribute to injury risk.

Objective: To investigate the influence of anticipation and motor-motor task performance on cutting biomechanics.

Surface electromyography of the forearm musculature during an overhead throwing rehabilitation progression program.

Objective: The flexor carpi ulnaris (FCU) and flexor digitorum superficialis (FDS) provide dynamic stabilization to the medial elbow. It remains unclear how these muscles function during progressive throwing exercises. Our objective was to compare FCU and FDS surface electromyography (sEMG) during a throwing progression.

The associations between quadriceps muscle strength, power, and knee joint mechanics in knee osteoarthritis: A cross-sectional study.

Background: Abnormal knee joint mechanics have been implicated in the pathogenesis and progression of knee osteoarthritis. Deficits in muscle function (i.e.

Real-time feedback during drop landing training improves subsequent frontal and sagittal plane knee kinematics.

Background: Although neuromuscular training featuring visual feedback may benefit modification of anterior cruciate ligament injury-risk linked knee kinematics, wide-spread clinical intervention has been limited to date. This study evaluated the effects of a Microsoft Kinect-based feedback system for modification of drop vertical jump knee kinematics traditionally consistent with predisposition to non-contact anterior cruciate ligament injury in female athletes. We hypothesized that a four-week feedback training protocol would increase peak knee flexion angle and frontal plane valgus-correlated knee separation distance during drop jump landing performance.

Patellofemoral pain syndrome alters neuromuscular control and kinetics during stair ambulation.

The aim of the study was to investigate differences in frontal plane knee kinetics, onset timing and duration of the gluteus medius (GMed), adductor longus (AL), and vastus medialis oblique (VMO) during stair ambulation between those with and without patellofemoral pain syndrome (PFPS). Twenty PFPS patients and twenty healthy participants completed stair ambulation while surface electromyography (EMG), video, and ground reaction forces were collected. PFPS patients had a higher peak internal knee abduction moment during stair ascent, and a higher internal knee abduction impulse for both ascent and descent.

Emergency face-mask removal effectiveness: a comparison of traditional and nontraditional football helmet face-mask attachment systems.

Context: Football helmet face-mask attachment design changes might affect the effectiveness of face-mask removal.

Objective: To compare the efficiency of face-mask removal between newly designed and traditional football helmets.

Design: Controlled laboratory study.

Scapular muscle activity in overhead athletes with symptoms of secondary shoulder impingement during closed chain exercises.

Objective: To determine the amount of muscle activation in 4 scapular muscles in overhead athletes with and without a history of secondary shoulder impingement, during 3 upper extremity closed chain exercises.

Design: One-between (group), one-within (exercise) repeated measures.

Setting: Controlled laboratory study.

Electromyography of 3 scapular muscles: a comparative analysis of the cuff link device and a standard push-up.

Context: The Cuff Link is a closed kinetic chain rehabilitation apparatus for the upper extremity. Limited research has established its effectiveness to elicit muscle activation of the scapular muscles.

Objective: To determine if scapular muscle activation differs in response to 2 upper extremity closed kinetic chain exercises: Cuff Link and standard push-up.

Cortisol concentrations in human skeletal muscle tissue after phonophoresis with 10% hydrocortisone gel.

Context: The delivery of hydrocortisone through phonophoresis is a widely prescribed technique for the treatment of various musculoskeletal inflammatory conditions. However, limited scientific evidence exists to support the efficacy of phonophoresis in delivering hydrocortisone to skeletal muscle tissue in humans.

Objective: To determine hydrocortisone (cortisol) concentrations in human skeletal muscle tissue after a phonophoresis treatment using 10% hydrocortisone gel.

Relationship between hip and knee strength and knee valgus during a single leg squat.

The purpose of this study was to determine the relationship between hip and knee strength, and valgus knee motion during a single leg squat. Thirty healthy adults (15 men, 15 women) stood on their preferred foot, squatted to approximately 60 deg of knee flexion, and returned to the standing position. Frontal plane knee motion was evaluated using 3-D motion analysis.

Face-Mask Removal: Movement and Time Associated With Cutting of the Loop Straps.

OBJECTIVE: To quantify the amount of helmet movement, time for task completion, tool satisfaction, and overall efficiency for various face-mask removal tools during football helmet face-mask removal. DESIGN AND SETTING: Each subject performed one trial with the anvil pruner (AP), Face Mask Extractor (FME), PVC pipe cutter (PVC), and Trainer's Angel (TA). Each subject cut through 4 loop straps and removed the face mask while kneeling behind the athlete's head.

A 3-Dimensional Analysis of Face-Mask Removal Tools in Inducing Helmet Movement.

OBJECTIVE: To evaluate the performance of specific face-mask removal tools during football helmet face-mask retraction using 3-dimensional (3-D) video. DESIGN AND SETTING: Four different tools were used: the anvil pruner (AP), polyvinyl chloride pipe cutters (PVC), Face Mask (FM) Extractor (FME), and Trainer's Angel (TA). Subjects retracted a face mask once with each tool.