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(Anterior cruciate ligament) AND (hoffmann reflex)

Sarah H Ward, J Troy Blackburn, Darin A Padua, Laura E Stanley, Matthew S Harkey, Brittney A Luc-Harkey, Brian Pietrosimone
CONTEXT:   Aberrant biomechanics may affect force attenuation at the knee during dynamic activities, potentially increasing the risk of sustaining a knee injury or hastening the development of osteoarthritis after anterior cruciate ligament reconstruction (ACLR). Impaired quadriceps neuromuscular function has been hypothesized to influence the development of aberrant biomechanics. OBJECTIVE:   To determine the association between quadriceps neuromuscular function (strength, voluntary activation, and spinal-reflex and corticomotor excitability) and sagittal-plane knee biomechanics during jump landings in individuals with ACLR...
February 2018: Journal of Athletic Training
Matthew S Harkey, Brittney A Luc-Harkey, Adam S Lepley, Terry L Grindstaff, Phillip Gribble, J Troy Blackburn, Jeffrey T Spang, Brian Pietrosimone
PURPOSE: Persistent voluntary quadriceps activation deficits are common after anterior cruciate ligament reconstruction (ACLR), but the direct causes are unclear. The primary purpose of this study was to determine whether spinal reflex excitability deficits are present in individuals with a history of ACLR, and secondarily to determine whether spinal reflex excitability predicts which individuals possess full voluntary quadriceps activation. METHODS: One hundred and forty-seven individuals (74 healthy and 73 ACLR) participated in this cross-sectional case-control study...
December 2016: Medicine and Science in Sports and Exercise
Brian G Pietrosimone, Adam S Lepley, Hayley M Ericksen, Amy Clements, David H Sohn, Phillip A Gribble
CONTEXT: Neuromuscular dysfunction is common after anterior cruciate ligament reconstruction (ACL-R). However, little is known about quadriceps spinal-reflex and descending corticomotor excitability after ACL-R. Understanding the effects of ACL-R on spinal-reflex and corticomotor excitability will help elucidate the origins of neuromuscular dysfunction. OBJECTIVE: To determine whether spinal-reflex excitability and corticomotor excitability differed between the injured and uninjured limbs of patients with unilateral ACL-R and between these limbs and the matched limbs of healthy participants...
June 2015: Journal of Athletic Training
A S Lepley, P A Gribble, A C Thomas, M A Tevald, D H Sohn, B G Pietrosimone
The purpose of this investigation was to evaluate differences in quadriceps corticospinal excitability, spinal-reflexive excitability, strength, and voluntary activation before, 2 weeks post and 6 months post-anterior cruciate ligament reconstruction (ACLr). This longitudinal, case-control investigation examined 20 patients scheduled for ACLr (11 females, 9 males; age: 20.9 ± 4.4 years; height:172.4 ± 7.5 cm; weight:76.2 ± 11.8 kg) and 20 healthy controls (11 females, 9 males; age:21.7 ± 3...
December 2015: Scandinavian Journal of Medicine & Science in Sports
Christopher M Kuenze, Jay Hertel, Arthur Weltman, David Diduch, Susan A Saliba, Joseph M Hart
CONTEXT: Return to activity in the presence of quadriceps dysfunction may predispose individuals with anterior cruciate ligament reconstruction (ACLR) to long-term joint degeneration. Asymmetry may manifest during movement and result in altered knee-joint-loading patterns; however, the underlying neurophysiologic mechanisms remain unclear. OBJECTIVE: To compare limb symmetry of quadriceps neuromuscular function between participants with ACLR and participants serving as healthy controls...
March 2015: Journal of Athletic Training
Joseph M Hart, Christopher M Kuenze, David R Diduch, Christopher D Ingersoll
CONTEXT: Persistent muscle weakness after anterior cruciate ligament (ACL) reconstruction may be due to underlying activation failure and arthrogenic muscle inhibition (AMI). Knee-joint cryotherapy has been shown to improve quadriceps function transiently in those with AMI, thereby providing an opportunity to improve quadriceps muscle activation and strength in patients with a reconstructed ACL. OBJECTIVE: To compare quadriceps muscle function in patients with a reconstructed ACL who completed a 2-week intervention including daily cryotherapy (ice bag), daily exercises, or both...
November 2014: Journal of Athletic Training
Adam S Lepley, Hayley M Ericksen, David H Sohn, Brian G Pietrosimone
BACKGROUND: Persistent quadriceps weakness is common following anterior cruciate ligament reconstruction (ACLr). Alterations in spinal-reflexive excitability, corticospinal excitability and voluntary activation have been hypothesized as underlying mechanisms contributing to quadriceps weakness. The aim of this study was to evaluate the predictive capabilities of spinal-reflexive excitability, corticospinal excitability and voluntary activation on quadriceps strength in healthy and ACLr participants...
June 2014: Knee
Mark Hoffman, Rod A Harter, Bradley T Hayes, Edward M Wojtys, Paul Murtaugh
CONTEXT: Sex hormone fluctuations have been implicated as a contributing factor to the high rates of noncontact injury to the anterior cruciate ligament in females. OBJECTIVE: To determine the strength of the relationships among variables of sex hormone concentrations, motoneuron excitability, and anterior tibial displacement (ATD) in women and men and to determine if these relationships differ between the sexes. DESIGN: Cohort study. SETTING: Sports medicine laboratory...
July 2008: Journal of Athletic Training
M Hoffman, D M Koceja
Rupture of the anterior cruciate ligament (ACL) typically leads to surgical reconstruction followed by an extensive rehabilitation program. One of the most commonly experienced complications associated with ACL rupture and reconstruction is quadriceps muscle atrophy. A clear understanding of the exact mechanisms associated with ACL related atrophy remains undocumented. The purpose of the present study was to investigate maximum H-reflex to maximum M-wave ratio as well as quadriceps deficit for both isometric and isokinetic peak torques in a post ACL reconstruction population...
September 2000: International Journal of Neuroscience
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