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Thomas E Klootwyk - One of the best experts on this subject based on the ideXlab platform.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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: A3 3 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). Subjects: Thirty neurologically sound volunteers (age 5 21.8 6 2.4 years; height 5 175.6 6 9.6 cm; mass 5 71.5 6 13.3 kg) participated in this study. Measurements: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. Results: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. Conclusions: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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). SUBJECTS: Thirty neurologically sound volunteers (age = 21.8 +/- 2.4 years; height = 175.6 +/- 9.6 cm; mass = 71.5 +/- 13.3 kg) participated in this study. MEASUREMENTS: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. RESULTS: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. CONCLUSIONS: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
J T Hopkins - One of the best experts on this subject based on the ideXlab platform.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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: A3 3 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). Subjects: Thirty neurologically sound volunteers (age 5 21.8 6 2.4 years; height 5 175.6 6 9.6 cm; mass 5 71.5 6 13.3 kg) participated in this study. Measurements: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. Results: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. Conclusions: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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). SUBJECTS: Thirty neurologically sound volunteers (age = 21.8 +/- 2.4 years; height = 175.6 +/- 9.6 cm; mass = 71.5 +/- 13.3 kg) participated in this study. MEASUREMENTS: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. RESULTS: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. CONCLUSIONS: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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effect of knee Joint Effusion on quadriceps and soleus motoneuron pool excitability
Medicine and Science in Sports and Exercise, 2001Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, B A Krause, Mitchell L CordovaAbstract:ABSTRACTHOPKINS, J. T., C. D. INGERSOLL, B. A. KRAUSE, J. E. EDWARDS, and M. L. CORDOVA. Effect of knee Joint Effusion onquadriceps and soleus motoneuron pool excitability. Med. Sci. Sports Exerc., Vol. 33, No. 1, 2001, pp. 123-126. Purpose: To examinechanges in quadriceps and soleus MN pool activity resulting from knee Joint Effusion over a 4-h period and assess the relationshipbetween the muscles. Methods: A repeated measures before-after trial design was used for this study. Eight, neurologically soundvolunteers (age 23.3 + 2.1 yr, height 171.8 t 15.9 cm, mass 65.5 + 17.7 kg) participated in this study. An area superomedial to thepatella was cleaned and anesthetized, and 30 mL of sterile saline was injected into the knee Joint capsule to mimic mechanical JointEffusion. The Hoffman reflex (H-reflex) was elicited by applying a percutaneous stimulus to the appropriate nerve and recording theresponse through surface electromyography. Soleus and vastus medialis H-reflex measures were collected from each volunteer before,at 30 min, 90 min, 150 min, and 210 min intervals over a 4-h period after knee Effusion. Results: All soleus H-reflex measures afterEffusion (30 min 5.89 + 0.92 V; 90 min 6.16 + 0.48 V; 150 min 6.59 + 0.50 V; 210 min 6.70 + 0.56 V) were increased in relationto the preEffusion measure (5.01 -0.79 V). All vastus medialis H-reflex measures after Effusion (30 min 4.23 -0.94 V; 90 min 4.15+ 1.11 V; 150 min 4.16 + 0.57 V; and 210 min 4.99 - 1.23) were decreased in relation to the preEffusion measure (5.88 + 1.44 V;P ' 0.05). Conclusions: Afferent activity from the knee Joint capsule resulted in an inhibitory effect on the vastus medialis and afacilitatory effect on the soleus. Facilitation of the soleus in cooperation with other lower extremity musculature could be a mechanismfor compensation of the inhibited quadriceps to maintain lower kinetic chain function. Key Words: ARTHROGENIC MUSCLEINHIBITION, HOFFMAN REFLEX, REHABILITATION
Jeffrey E Edwards - One of the best experts on this subject based on the ideXlab platform.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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: A3 3 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). Subjects: Thirty neurologically sound volunteers (age 5 21.8 6 2.4 years; height 5 175.6 6 9.6 cm; mass 5 71.5 6 13.3 kg) participated in this study. Measurements: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. Results: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. Conclusions: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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). SUBJECTS: Thirty neurologically sound volunteers (age = 21.8 +/- 2.4 years; height = 175.6 +/- 9.6 cm; mass = 71.5 +/- 13.3 kg) participated in this study. MEASUREMENTS: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. RESULTS: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. CONCLUSIONS: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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effect of knee Joint Effusion on quadriceps and soleus motoneuron pool excitability
Medicine and Science in Sports and Exercise, 2001Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, B A Krause, Mitchell L CordovaAbstract:ABSTRACTHOPKINS, J. T., C. D. INGERSOLL, B. A. KRAUSE, J. E. EDWARDS, and M. L. CORDOVA. Effect of knee Joint Effusion onquadriceps and soleus motoneuron pool excitability. Med. Sci. Sports Exerc., Vol. 33, No. 1, 2001, pp. 123-126. Purpose: To examinechanges in quadriceps and soleus MN pool activity resulting from knee Joint Effusion over a 4-h period and assess the relationshipbetween the muscles. Methods: A repeated measures before-after trial design was used for this study. Eight, neurologically soundvolunteers (age 23.3 + 2.1 yr, height 171.8 t 15.9 cm, mass 65.5 + 17.7 kg) participated in this study. An area superomedial to thepatella was cleaned and anesthetized, and 30 mL of sterile saline was injected into the knee Joint capsule to mimic mechanical JointEffusion. The Hoffman reflex (H-reflex) was elicited by applying a percutaneous stimulus to the appropriate nerve and recording theresponse through surface electromyography. Soleus and vastus medialis H-reflex measures were collected from each volunteer before,at 30 min, 90 min, 150 min, and 210 min intervals over a 4-h period after knee Effusion. Results: All soleus H-reflex measures afterEffusion (30 min 5.89 + 0.92 V; 90 min 6.16 + 0.48 V; 150 min 6.59 + 0.50 V; 210 min 6.70 + 0.56 V) were increased in relationto the preEffusion measure (5.01 -0.79 V). All vastus medialis H-reflex measures after Effusion (30 min 4.23 -0.94 V; 90 min 4.15+ 1.11 V; 150 min 4.16 + 0.57 V; and 210 min 4.99 - 1.23) were decreased in relation to the preEffusion measure (5.88 + 1.44 V;P ' 0.05). Conclusions: Afferent activity from the knee Joint capsule resulted in an inhibitory effect on the vastus medialis and afacilitatory effect on the soleus. Facilitation of the soleus in cooperation with other lower extremity musculature could be a mechanismfor compensation of the inhibited quadriceps to maintain lower kinetic chain function. Key Words: ARTHROGENIC MUSCLEINHIBITION, HOFFMAN REFLEX, REHABILITATION
Christopher D Ingersoll - One of the best experts on this subject based on the ideXlab platform.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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: A3 3 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). Subjects: Thirty neurologically sound volunteers (age 5 21.8 6 2.4 years; height 5 175.6 6 9.6 cm; mass 5 71.5 6 13.3 kg) participated in this study. Measurements: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. Results: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. Conclusions: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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cryotherapy and transcutaneous electric neuromuscular stimulation decrease arthrogenic muscle inhibition of the vastus medialis after knee Joint Effusion
Journal of Athletic Training, 2002Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, Thomas E KlootwykAbstract: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). SUBJECTS: Thirty neurologically sound volunteers (age = 21.8 +/- 2.4 years; height = 175.6 +/- 9.6 cm; mass = 71.5 +/- 13.3 kg) participated in this study. MEASUREMENTS: Hoffmann-reflex measurements were collected using a percutaneous stimulus to the femoral nerve and surface electromyography of the VM. RESULTS: Hoffmann-reflex measurements from the cryotherapy and TENS groups were greater than measurements from the control group at 15 and 30 minutes after injection. Measurements from the cryotherapy group were greater than for the TENS group, and measurements for the TENS group were greater than those for the control group at 45 minutes. At 60 minutes, the cryotherapy group measurements were greater than the TENS and control group measures. Measurements at 15, 30, 45, and 60 minutes after injection were reduced compared with the preinjection and postinjection measurements in the control group. Measurements in the cryotherapy group at 30, 45, and 60 minutes were greater than the preinjection, postinjection, and 15-minute data. No differences between time intervals existed in the TENS group. CONCLUSIONS: Artificial knee Joint Effusion results in VM inhibition. Cryotherapy and TENS both disinhibit the quadriceps after knee Joint Effusion, and cryotherapy further facilitates the quadriceps motoneuron pool. Cryotherapy treatment resulted in facilitation of the VM motoneuron pool during the post-treatment phase. The TENS treatment failed to disinhibit the VM motoneuron pool by 30 minutes postinjection.
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effect of knee Joint Effusion on quadriceps and soleus motoneuron pool excitability
Medicine and Science in Sports and Exercise, 2001Co-Authors: J T Hopkins, Christopher D Ingersoll, Jeffrey E Edwards, B A Krause, Mitchell L CordovaAbstract:ABSTRACTHOPKINS, J. T., C. D. INGERSOLL, B. A. KRAUSE, J. E. EDWARDS, and M. L. CORDOVA. Effect of knee Joint Effusion onquadriceps and soleus motoneuron pool excitability. Med. Sci. Sports Exerc., Vol. 33, No. 1, 2001, pp. 123-126. Purpose: To examinechanges in quadriceps and soleus MN pool activity resulting from knee Joint Effusion over a 4-h period and assess the relationshipbetween the muscles. Methods: A repeated measures before-after trial design was used for this study. Eight, neurologically soundvolunteers (age 23.3 + 2.1 yr, height 171.8 t 15.9 cm, mass 65.5 + 17.7 kg) participated in this study. An area superomedial to thepatella was cleaned and anesthetized, and 30 mL of sterile saline was injected into the knee Joint capsule to mimic mechanical JointEffusion. The Hoffman reflex (H-reflex) was elicited by applying a percutaneous stimulus to the appropriate nerve and recording theresponse through surface electromyography. Soleus and vastus medialis H-reflex measures were collected from each volunteer before,at 30 min, 90 min, 150 min, and 210 min intervals over a 4-h period after knee Effusion. Results: All soleus H-reflex measures afterEffusion (30 min 5.89 + 0.92 V; 90 min 6.16 + 0.48 V; 150 min 6.59 + 0.50 V; 210 min 6.70 + 0.56 V) were increased in relationto the preEffusion measure (5.01 -0.79 V). All vastus medialis H-reflex measures after Effusion (30 min 4.23 -0.94 V; 90 min 4.15+ 1.11 V; 150 min 4.16 + 0.57 V; and 210 min 4.99 - 1.23) were decreased in relation to the preEffusion measure (5.88 + 1.44 V;P ' 0.05). Conclusions: Afferent activity from the knee Joint capsule resulted in an inhibitory effect on the vastus medialis and afacilitatory effect on the soleus. Facilitation of the soleus in cooperation with other lower extremity musculature could be a mechanismfor compensation of the inhibited quadriceps to maintain lower kinetic chain function. Key Words: ARTHROGENIC MUSCLEINHIBITION, HOFFMAN REFLEX, REHABILITATION
Frank W Roemer - One of the best experts on this subject based on the ideXlab platform.
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mri of ankle sprain the association between Joint Effusion and structural injury severity in a large cohort of athletes
European Radiology, 2019Co-Authors: Ali Guermazi, Frank W Roemer, M D Crema, Branislav Krivokapic, Predrag Gravilovic, Nebojsa Popovic, Pieter DhoogheAbstract:To test the hypothesis if presence and amount of Effusion in the tibiotalar and talocalcaneal Joints are associated with an increased risk for severe structural injury in ankle sprains. A total of 261 athletes sustaining acute ankle sprains were assessed on MRI for the presence and the amount of Joint Effusion in the tibiotalar and talocalcaneal Joints, as well as for ligamentous and osteochondral injury. Specific patterns of injury severity were defined based on lateral collateral ligament, syndesmotic, and talar osteochondral involvement. The presence and the amount Effusion (grades 1 and 2) were considered as risk factors for severe injury, while physiological amount of fluid (grade 0) was considered as the referent. Conditional logistic regression was used to assess the risk for associated severe injuries (syndesmotic ligament rupture and talar osteochondral lesions) based on the presence and amount of tibiotalar and talocalcaneal Effusions. For ankles exhibiting large (grade 2) Effusion in the tibiotalar Joint (without concomitant grade 2 Effusion in the talocalcaneal Joint), the risk for partial or complete syndesmotic ligament rupture was increased more than eightfold (adjusted odds ratio 8.7 (95% confidence intervals 3.7–20.7); p < 0.001). The presence of any degree of Effusion in any of the Joints was associated with an increased risk for severe talar osteochondral involvement (several odds ratio values reported; p < 0.001), including large subchondral contusions and any acute osteochondral lesion. The presence of tibiotalar and talocalcaneal Effusions is associated with an increased risk for severe concomitant structural injury in acute ankle sprains. • For ankles exhibiting severe (grade 2) Effusion in the tibiotalar Joint after sprain, the risk for partial or complete syndesmotic ligament rupture increases more than eightfold. • The presence of Effusion in both tibiotalar and talocalcaneal Joints is associated with an increased risk for severe ligament injury such as complete ATFL rupture as well as partial or complete syndesmotic ligament rupture. • The presence of Effusion in the tibiotalar or talocalcaneal Joints after sprain is associated with an increased risk for severe talar osteochondral involvement.
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presence of mri detected Joint Effusion and synovitis increases the risk of cartilage loss in knees without osteoarthritis at 30 month follow up the most study
Annals of the Rheumatic Diseases, 2011Co-Authors: Frank W Roemer, Ali Guermazi, David T Felson, Jingbo Niu, Michael C Nevitt, M D Crema, J A Lynch, Cora E Lewis, James C Torner, Yuqing ZhangAbstract:Objective To evaluate if two different measures of synovial activation, baseline Hoffa synovitis and Effusion synovitis, assessed by MRI, predict cartilage loss in the tibiofemoral Joint at 30 months follow-up in subjects with neither cartilage damage nor tibiofemoral radiographic osteoarthritis of the knee. Methods Non-contrast-enhanced MRI was performed using proton density-weighted fat-suppressed sequences in the axial and sagittal planes and a short tau inversion recovery sequence in the coronal plane. Hoffa synovitis, Effusion synovitis and cartilage status were assessed semiquantitatively according to the WORMS scoring system. Included were knees that had neither radiographic osteoarthritis nor MRI-detected tibiofemoral cartilage damage at the baseline visit. The presence of Hoffa synovitis was defined as any grade ≥2 (range 0–3) and Effusion synovitis as any grade ≥2 (range 0–3). Logistic regression was performed to examine the relation of the presence of either measure to the risk of cartilage loss at 30 months adjusting for other potential confounders. Results Of 514 knees included in the analysis, the prevalence of Hoffa synovitis and Effusion synovitis at the baseline visit was 8.4% and 10.3%, respectively. In the multivariable analysis, baseline Effusion synovitis was associated with an increased risk of cartilage loss. No such association was observed for baseline Hoffa synovitis. Conclusions Baseline Effusion synovitis, but not Hoffa synovitis, predicted cartilage loss. The findings suggest that Effusion synovitis, a reflection of inflammatory activity including Joint Effusion and synovitic thickening, may play a role in the future development of cartilage lesions in knees without osteoarthritis.
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anatomical distribution of synovitis in knee osteoarthritis and its association with Joint Effusion assessed on non enhanced and contrast enhanced mri
Osteoarthritis and Cartilage, 2010Co-Authors: Ali Guermazi, Frank W Roemer, Kassim M Javaid, M Thomas, A Kiran, Richard Keen, L KingAbstract:Summary Purpose To describe the anatomical distribution of synovitis and its association with Joint Effusion on non-enhanced and contrast-enhanced (CE) MRI in patients with knee osteoarthritis (OA). Methods Baseline MRI was performed at 1.5T using axial proton density (PD)-weighted (w) fat suppressed (fs) and axial and sagittal T1-w fs CE sequences. Synovial enhancement was scored in nine articular subregions. Maximum synovial enhancement was grouped as absent (0), equivocal (1) and definite (2 and 3). Effusion was scored from 0 to 3 on the axial sequences. We described the anatomical distribution of synovitis, its association with Effusion and compared assessment of Effusion on T1-w fs CE and PD fs sequences. Results 111 subjects were included and examined by MRI. 89.2% of knees exhibited at least one subregion with a minimum grade 2 and 39.6% at the maximum of a grade 3. The commonest sites for definite synovitis were posterior to the posterior cruciate ligament (PCL) in 71.2% and in the suprapatellar region in 59.5% of all knees. On T1-w fs CE, 73.0% of knees showed any Effusion. Definite synovitis in at least one location was present in 96.3% knees with an Effusion and in 70.0% without an Effusion. Higher grades of Effusion were scored on the PD fs sequence. Conclusion Definite synovitis was present in the majority of knees with or without Effusion with the commonest sites being posterior to the PCL and in the suprapatellar recess. Joint Effusion as measured on PD fs images does not only represent Effusion but also synovial thickening.
