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The effects of patellar tendon vibration on quadriceps strength in anterior cruciate ligament reconstructed knees.
Phys Ther Sport
November 2019
University of Virginia, Charlottesville, VA, USA.
Objectives: To examine the immediate effects of prolonged patellar tendon vibration on quadriceps strength in anterior cruciate ligament reconstructed (ACLR) knees with bone-patellar tendon-bone (BTB) grafts and non-BTB grafts, and healthy control knees.
Design: Pretest-posttest design.
Setting: Laboratory.
Is gamma loop dysfunction related to bilateral inhibition in anterior knee pain?
Muscle Nerve
February 2016
School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland A1C 5S7, Canada.
Introduction: The potential relationship between bilateral quadriceps inhibition in individuals with unilateral anterior knee pain (AKP) and gamma loop dysfunction is examined in this study.
Methods: Twelve individuals with unilateral AKP and 10 healthy controls were recruited. Quadriceps voluntary activation (%VA) was quantified using a triggered interpolated twitch technique.
Acute effects of passive stretching of the plantarflexor muscles on neuromuscular function: the influence of age.
Age (Dordr)
March 2015
Neuromuscular Research Laboratory, Department of Exercise and Sport Science, University of North Carolina-Chapel Hill, 209 Fetzer Hall, CB #8700, Chapel Hill, NC, 27599-8700, USA,
The acute effects of stretching on peak force (Fpeak), percent voluntary activation (%VA), electromyographic (EMG) amplitude, maximum range of motion (MROM), peak passive torque, the passive resistance to stretch, and the percentage of ROM at EMG onset (%EMGonset) were examined in 18 young and 19 old men. Participants performed a MROM assessment and a maximal voluntary contraction of the plantarflexors before and immediately after 20 min of passive stretching. Fpeak (-11 %), %VA (-6 %), and MG EMG amplitude (-9 %) decreased after stretching in the young, but not the old (P > 0.
View Article and Find Full Text PDFMechanisms of quadriceps muscle weakness in knee joint osteoarthritis: the effects of prolonged vibration on torque and muscle activation in osteoarthritic and healthy control subjects.
Arthritis Res Ther
December 2012
Health and Rehabilitation Research Institute, AUT University, 90 Akoranga Drive, Northcote, 0627 Auckland, New Zealand.
Introduction: A consequence of knee joint osteoarthritis (OA) is an inability to fully activate the quadriceps muscles, a problem termed arthrogenic muscle inhibition (AMI). AMI leads to marked quadriceps weakness that impairs physical function and may hasten disease progression. The purpose of the present study was to determine whether γ-loop dysfunction contributes to AMI in people with knee joint OA.
View Article and Find Full Text PDFReflex gain of muscle spindle pathways during fatigue.
Exp Brain Res
February 2007
School of Kinesiology and Health Science, York University, Toronto, ON, Canada.
There are conflicting observations of the effects of fatigue on the sensitivity of large diameter Ia afferents. Our goal was to characterize any fatigue-related changes in the spinal reflex pathways during fatigue. Manipulation of the Ia afferent response by vibration and tendon tap, in which the motor neuron pool is modulated by both short- and long-loop activation from muscle spindles, were elicited before and after a fatigue task.
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