Search Results

You are looking at 1 - 10 of 1,161 items for :

  • Refine by Access: All Content x
Clear All
Restricted access

Does Reactive Neuromuscular Training Increase Gluteal Musculature Activation During Squatting Movements? A Critically Appraised Topic

Ian Brewer, Josh Zimmerman, Marcie Fyock-Martin, Nelson Cortes, and Joel Martin

Clinical Scenario The squat movement pattern is a foundational motor skill that is utilized across the lifespan. The ability to squat with proper technique can improve the performance of activities of daily living and athletic movements as well as reduce the risk of sport-related injuries. 1 As a

Restricted access

Comparison of 5 Normalization Methods for Knee Joint Moments in the Single-Leg Squat

Steven M. Hirsch, Christopher J. Chapman, David M. Frost, and Tyson A.C. Beach

assessed using NJM about the mediolateral (NJM-ML) and anteroposterior (NJM-AP) axes of the knee joint during a single-leg squat movement, using data extracted from a published study that were collected for a different purpose. 13 It was hypothesized that dividing NJM by mass × height and mass × leg

Restricted access

Hip Adduction Does not Affect VMO EMG Amplitude or VMO:VL Ratios during a Dynamic Squat Exercise

Michelle Boling, Darin Padua, J. Troy Blackburn, Meredith Petschauer, and Christopher Hirth


Clinicians commonly attempt to facilitate vastus medialis oblique (VMO) activity by instructing patients to squeeze a ball between their knees during squatting exercises.


To determine whether VMO activation amplitude and the VMO to vastus lateralis (VL) activation ratio (VMO:VL) were altered when performing active hip adduction during a dynamic squat exercise.


Single test session.


Fifteen healthy subjects, with no history of knee pain, volunteered for this study.


Surface EMG of the VMO, VL, and hip adductor (ADD) muscles were recorded while subjects performed 10 consecutive squats against their body weight through a range of 0° to 90° of knee flexion. Subjects performed the squat exercises during two different conditions: (1) active hip adduction and (2) no hip adduction.

Main Outcome Measures:

Average VMO EMG amplitude and VMO:VL ratio were determined during the knee flexion (0° to 90°) and knee extension (90° to 0°) phases of the squat exercise.


Active hip adduction did not significantly change VMO amplitude or VMO:VL ratio during the knee flexion or knee extension phases of the dynamic squat exercise.


Based on these results, we conclude that VMO amplitude and the VMO: VL ratio are not influenced by performing active hip adduction during a dynamic squat exercise in healthy subjects.

Restricted access

Comparison of Regional Hamstrings Activation During Resistance Exercises in Females With Prior Athletic Experience

Kevin McCurdy and John Walker

, which may affect muscle activation patterns. Methods Design This study was a repeated-measures design. The dependent variables in this study were the percentage of maximum EMG measures for each of 4 lifts: (1) bilateral squat (BS), (2) modified single-leg squat (MSLS), (3) leg curl (LC), and (4) stiff

Restricted access

Weight-Bearing Exercises on Slideboard Increase Quadriceps and Hamstring Activation Levels and Improve Hip- and Knee-Flexion Angles in Physically Active Individuals

Cigdem Demir and Gulcan Harput

Squat and lunges are one of the most prescribed lower-extremity weight-bearing exercises in a variety of contexts, including rehabilitation and athletic performance. These exercises primarily activate the quadriceps muscle but also activate the muscles around the hip and ankle joints. 1 – 3

Restricted access

Acute Effects of Hip Mobilization With Movement Technique on Pain and Biomechanics in Females With Patellofemoral Pain: A Randomized, Placebo-Controlled Trial

Guilherme S. Nunes, Débora Faria Wolf, Daniel Augusto dos Santos, Marcos de Noronha, and Fábio Viadanna Serrão

characterized by diffuse pain in the anterior region of the knee and is more evident in activities that overload the patellofemoral joint (PFJ), such as squatting, climbing, and descending stairs. 3 Poor control of dynamic knee valgus during weight-bearing activities may be a trigger factor for PFP. 4 , 5

Restricted access

Intrarater and Interrater Reliability and Agreement of a Method to Quantify Lower-Extremity Kinematics Using Remote Data Collection

Margaret S. Harrington, Ikeade C. Adeyinka, and Timothy A. Burkhart

demonstrated good to excellent accuracy and reliability for frontal and sagittal plane hip and knee kinematics during a variety of dynamic tasks (eg, squatting, gait, lateral stepping, jumping, and cycling). 3 – 7 Despite the capability of open source 2D motion analysis software such as Kinovea 8 to track

Restricted access

Effect of Meniscal Repair on Joint Loading in Athletes With Anterior Cruciate Ligament Reconstruction at 3 Months Following Surgery

Joseph Hannon, J. Craig Garrison, Sharon Wang-Price, Shiho Goto, Angellyn Grondin, James Bothwell, and Curtis Bush

at the hip of the involved limb during a double-limb squat task in participants at 12 weeks following ACL-R, compared with healthy controls. Compensatory movements are typically examined in the later stages of rehabilitation to help assist in return-to-play decision making and to help reduce the risk

Restricted access

Effect of Volume on Eccentric Overload–Induced Postactivation Potentiation of Jumps

Kevin L. de Keijzer, Stuart A. McErlain-Naylor, Antonio Dello Iacono, and Marco Beato

Such exercise utilizes the physiological advantages offered by a greater loading of the eccentric phase of the exercise (eg, squat). 12 This overload facilitates greater motor unit recruitment and triggering of sarcoplasmic calcium release, 13 considered the main central and peripheral mechanisms

Restricted access

Quadriceps Function and Athletic Performance in Highly Trained Female Athletes

Frederick J. Henderson, Wakana Sasakabe, Kuwano Satoshi, Norihiro Shima, and Yohei Shimokochi

extension torque related to higher single-leg vertical jump height in healthy or ACL-reconstructed subjects. 3 , 5 , 6 , 11 , 12 Likewise, higher maximum strength of the quadriceps has been linked to superior back squat 3-repetition maximum, single-leg broad jump distance, a 40-yard figure-8 test time, 2