as functional magnetic resonance imaging (fMRI) and electroencephalography allow us to measure the human brain function noninvasively during experimental tasks, such as joint loading. Previous work has assessed electroencephalography during commercial arthrometer anterior laxity testing designed to
Search Results
A Magnetic Resonance Imaging–Compatible Device to Perform In Vivo Anterior Knee Joint Loading
Kyoungyoun Park-Braswell, Sandra J. Shultz, and Randy J. Schmitz
Measuring Muscle Activity in Sprinters Using T2-Weighted Magnetic Resonance Imaging
Takaya Yoshimoto, Yoshihiro Chiba, Hayato Ohnuma, Takuya Yanaka, and Norihide Sugisaki
proximal part of the anterior thigh and in the middle part of the posterior thigh compared to those with a 100-m running record in the 11-second range. Efforts are also being made to evaluate muscle morphology using magnetic resonance imaging (MRI). In contrast to ultrasound, MRI makes it possible to
Brain Activity During Experimental Knee Pain and Its Relationship With Kinesiophobia in Patients With Patellofemoral Pain: A Preliminary Functional Magnetic Resonance Imaging Investigation
Kim D. Barber Foss, Alexis B. Slutsky-Ganesh, Jed A. Diekfuss, Dustin R. Grooms, Janet E. Simon, Daniel K. Schneider, Neeru Jayanthi, Joseph D. Lamplot, Destin Hill, Mathew Pombo, Philip Wong, David A. Reiter, and Gregory D. Myer
its relationship to kinesiophobia in patients with PFP. To accomplish this, we administered 2 tests during brain functional magnetic resonance imaging (fMRI) for patients with PFP: (1) a modified Clarke test (experimental knee pain condition; noxious induction via experimenter patella pressure and
Lumbar Muscle Activity During Common Lifts: A Preliminary Study Using Magnetic Resonance Imaging
John M. Mayer, James E. Graves, Todd M. Manini, James L. Nuzzo, and Lori L. Ploutz-Snyder
The purpose of this preliminary study was to assess lumbar multifidus, erector spinae, and quadratus lum-borum muscle activity during lifts as measured by changes in transverse relaxation time (T2) from magnetic resonance imaging (MRI). Thirteen healthy adults performed dynamic squat, stoop, and asymmetric stoop lifts at a standard load, with each lift followed by MRI. Increase in T2 for the multifidus and erector spinae was greater for the stoop than squat. No difference in T2 increase was noted between the multifidus and erector spinae for the squat or stoop. Increase in T2 for the contralateral multifidus was less for the asymmetric stoop than stoop. Future research using MRI and other biomechanical techniques is needed to fully characterize lumbar muscle activity during lifts for various populations, settings, postures, and loads.
Evaluating Patellar Kinematics Through Magnetic Resonance Imaging During Open- and Closed-Kinetic-Chain Exercises
Lílian Ramiro Felicio, Marcelo Camargo Saad, Rogério Ferreira Liporaci, Augusto do Prado Baffa, Antônio Carlos dos Santos, and Débora Bevilaqua-Grossi
Purpose:
To evaluate patellar kinematics of volunteers without knee pain at rest and during isometric contraction in open- and closed-kinetic-chain exercises.
Methods:
Twenty individuals took part in this study. All were submitted to magnetic resonance imaging (MRI) during rest and voluntary isometric contraction (VIC) in the open and closed kinetic chain at 15°, 30°, and 45° of knee flexion. Through MRI and using medical e-film software, the following measurements were evaluated: sulcus angle, patellar-tilt angle, and bisect offset. The mixed-effects linear model was used for comparison between knee positions, between rest and isometric contractions, and between the exercises.
Results:
Data analysis revealed that the sulcus angle decreased as knee flexion increased and revealed increases with isometric contractions in both the open and closed kinetic chain for all knee-flexion angles. The patellar-tilt angle decreased with isometric contractions in both the open and closed kinetic chain for every knee position. However, in the closed kinetic chain, patellar tilt increased significantly with the knee flexed at 15°. The bisect offset increased with the knee flexed at 15° during isometric contractions and decreased as knee flexion increased during both exercises.
Conclusion:
VIC in the last degrees of knee extension may compromise patellar dynamics. On the other hand, it is possible to favor patellar stability by performing muscle contractions with the knee flexed at 30° and 45° in either the open or closed kinetic chain.
Cardiorespiratory Fitness and Cardiac Magnetic Resonance Imaging in Childhood Acute Lymphoblastic Leukemia Survivors
Maxime Caru, Daniel Curnier, Pierre Dubois, Matthias G. Friedrich, Gregor Andelfinger, Maja Krajinovic, Caroline Laverdière, Daniel Sinnett, and Delphine Périé
18.0 Gy). Table 2 Prevalence of Cardiac Magnetic Resonance Imaging Parameters Among Childhood ALL Survivors Cardiorespiratory fitness (VO 2 peak) Physical activity level (MVLPA/wk) <31.4 mL·kg −1 ·min −1 (N = 39) ≥31.4 mL·kg −1 ·min −1 (N = 42) <150 min/wk (N = 48) ≥150 min/wk (N = 33) LV
MRI-Based Assessment of Lower-Extremity Muscle Volumes in Patients Before and After ACL Reconstruction
Grant E. Norte, Katherine R. Knaus, Chris Kuenze, Geoffrey G. Handsfield, Craig H. Meyer, Silvia S. Blemker, and Joseph M. Hart
also prohibit the use of force-based measurement techniques, such as isometric knee extension torque and muscle activation, or confound the accuracy of strength estimates during early phases of recovery. Magnetic resonance imaging (MRI)-based volumetric assessment of skeletal muscle, on the other hand
Clinical Diagnostic Tests Versus MRI Diagnosis of ACL Tears
Megan P. Brady and Windee Weiss
clinical diagnostic tests and magnetic resonance imaging (MRI) is debatable. 1 , 3 – 6 Because of the frequency of knee injury, 3 MRI is a common diagnostic tool used for imaging and diagnosis. 5 ACL tears are also diagnosed using clinical diagnostic tests. 1 , 3 – 6 Patient outcomes are dependent on a
Effect of Abdominal Electrical Muscle Stimulation Training With and Without Superimposed Voluntary Muscular Contraction on Lumbopelvic Control
Ui-Jae Hwang, Sung-Hoon Jung, Hyun-A Kim, Jun-Hee Kim, and Oh-Yun Kwon
Resonance Imaging Assessment of Abdominal Muscle Size Subjects were screened for contraindications to magnetic resonance imaging (MRI) by a medical practitioner before the study assessment. Subjects with metal implants or claustrophobia were excluded from the study. Subjects removed any metal objects on the
Effect of Impairment-Based Rehabilitation on Lower Leg Muscle Volumes and Strength in Patients With Chronic Ankle Instability: A Preliminary Study
Mark A. Feger, Luke Donovan, C. Collin Herb, Geoffrey G. Handsfield, Silvia S. Blemker, Joseph M. Hart, Susan A. Saliba, Mark F. Abel, Joseph S. Park, and Jay Hertel
Leisure-Time Physical Activity Scale 51.8 (23.0) Abbreviations: ADL, activities of daily living; CAI, chronic ankle instability; FAAM, Foot and Ankle Ability Measure; IdFAI, Identification of Functional Ankle Instability. Instruments Magnetic Resonance Imaging for Foot and Ankle Muscle Volumes Subjects
