Arthrogenic muscle inhibition

OBJECTIVE: To determine the effects of various therapeutic interventions on increasing voluntary quadriceps muscle activation. BACKGROUND: Decreased voluntary quadriceps activation is commonly associated with knee injury. Recently, research has focused on developing specific disinhibitory interventions to improve voluntary quadriceps activation; yet, it remains unknown which interventions are most effective in promoting this improvement. DATA SOURCES: We searched Web of Science from January 1, 1965 through September 27, 2012, using the key words quadriceps activation and transcutaneous electrical nerve stimulation, transcranial magnetic stimulation, cryotherapy, focal joint cooling, joint mobilization, joint mobilisation, joint manipulation, manual therapy, and neuromuscular electrical stimulation...

UNLABELLED: Backround: Knee trauma with arthrogenic muscle inhibition (AMI) lead to muscle weakness. The aim of this study was to analyse the intensity of AMI after meniscus and cartilage injuries and to investigate the association between age, BMI and severity of cartilage leasions with AMI. PATIENTS AND METHODS: 48 patients with meniscus or cartilage injury were preoperatively interviewed and examined for isometric maximum force values of the extension muscles of the knee joints...

OBJECTIVE: To evaluate the effects of whole body vibration (WBV) and local muscle vibration (LMV) on quadriceps function after experimental knee effusion (ie, simulated pathology). DESIGN: Randomized controlled trial. SETTING: Research laboratory. PARTICIPANTS: Healthy volunteers (N=43) were randomized to WBV (n=14), LMV (n=16), or control (n=13) groups. INTERVENTIONS: Saline was injected into the knee to induce quadriceps arthrogenic muscle inhibition (AMI)...

CONTEXT: Arthrogenic muscle inhibition is an important underlying factor in persistent quadriceps muscle weakness after knee injury or surgery. OBJECTIVE: To determine the magnitude and prevalence of volitional quadriceps activation deficits after knee injury. DATA SOURCES: Web of Science database. STUDY SELECTION: Eligible studies involved human participants and measured quadriceps activation using either twitch interpolation or burst superimposition on patients with knee injuries or surgeries such as anterior cruciate ligament deficiency (ACLd), anterior cruciate ligament reconstruction (ACLr), and anterior knee pain (AKP)...

OBJECTIVE: Arthrogenic muscle inhibition (AMI) contributes to quadriceps weakness and atrophy in knee arthritis and following joint injury. This laboratory-based study examined the efficacy of cryotherapy in reducing quadriceps AMI caused by intraarticular swelling. METHODS: Sixteen subjects without knee pathology participated, and were randomly assigned to a cryotherapy (n = 8) or control (n = 8) group. Surface electromyography (EMG) from vastus medialis and quadriceps torque measurements were recorded during maximum effort isometric contractions...

Arthrogenic muscle inhibition (AMI) impedes rehabilitation following knee joint injury by preventing activation of the quadriceps. AMI has been attributed to neuronal reflex activity in which altered afferent input originating from the injured joint results in a diminished efferent motor drive to the quadriceps muscles. Beginning to understand the mechanisms responsible for muscle inhibition following joint injury is vital to control or eliminate this phenomenon. Therefore, the purpose of this investigation is to determine if quadriceps AMI is mediated by a presynaptic regulatory mechanism...

OBJECTIVE: Arthrogenic muscle inhibition (AMI) is a presynaptic, ongoing reflex inhibition of joint musculature after distension or damage to the joint. The extent to which therapeutic interventions affect AMI is unknown. The purpose of this study was to verify that the vastus medialis (VM) is inhibited using the knee joint effusion model and to investigate the effects of cryotherapy and transcutaneous electric nerve stimulation (TENS) on AMI using this model. DESIGN AND SETTING: A 3 x 6 analysis of variance was used to compare Hoffmann-reflex data for treatment groups (cryotherapy, TENS, and control) across time (preinjection, postinjection, and 15, 30, 45, and 60 minutes after injection)...