Accuracy and Variability of Leg Velocities during Concentric and Eccentric Actions of the Quadriceps Femoris Muscles

1997 ◽  
Vol 84 (2) ◽  
pp. 575-586 ◽  
Author(s):  
Richard L. Gajdosik ◽  
David W. Faris ◽  
Teri K. Kato ◽  
Pat F. Roosa ◽  
Tamaki Matsumoto
Keyword(s):  
Range Of Motion ◽  
Coefficient Of Variation ◽  
Full Range ◽  
Velocity Overshoot ◽  
Concentric Force ◽  
Coefficients Of Variation ◽  
The Right ◽  
Muscle Actions ◽  
Eccentric Actions ◽  
Quadriceps Femoris Muscles

This study examined the ability to control leg velocities during concentric and eccentric actions of the right quadriceps muscles. Ten healthy women ( M age = 25.9 ± 3.5 yr.) were tested using the Isotonic Program of the KIN-COM II 500H dynamometer. They attempted to match velocity tracings of 10°, 20°, and 40°/sec. through 70° of knee range of motion at a load equal to 10% of their maximal mean concentric force. The actual mean velocities, mean percent deviation from the target velocities, and the coefficient of variation for both actions were calculated for 15°–75° (full range of motion), 15°—45° (shorter range of motion), and 46°–;75° (longer range of motion). Separate one-way analyses of variance with two trial factors (action x velocity) showed faster concentric velocities through the full and longer ranges of motion, and faster eccentric velocities through the shorter range of motion. Mean percent deviations indicated that the eccentric velocities were generally more accurate within all ranges of motion. Larger concentric coefficients of variation were found within the full and longer ranges of motion, and the coefficients of variation for both actions decreased as the velocities increased. An exaggerated ‘velocity overshoot’ at the onset of both actions probably contributed to differences in the velocities and coefficients of variation. The results indicated differences between the concentric and eccentric actions, explained in part by the testing methodology used and by the known mechanical and physiological characteristics of the two muscle actions.

Hemorrhage, Phenobarbital, and Fluctuating Cerebral Blood Flow Velocity in the Neonate

PEDIATRICS ◽  
1988 ◽  
Vol 82 (4) ◽  
pp. 548-553
Author(s):  
Karl C. K. Kuban ◽  
Helen Skouteli ◽  
Allen Cherer ◽  
Elizabeth Brown ◽  
Alan Leviton ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cohort Study ◽  
Cerebral Blood Flow ◽  
Coefficient Of Variation ◽  
Intraventricular Hemorrhage ◽  
Anterior Cerebral Artery ◽  
Cerebral Blood Flow Velocity ◽  
Coefficients Of Variation ◽  
Movement Artifact ◽  
The Right

Fifty-one sequential intubated babies with birth weights of less than 1,751 were evaluated by serial Doppler ultrasound during the first three days of life. These babies were part of a phenobarbital prophylaxis trial cohort study. Subependymal-intraventricular hemorrhage developed in 17 of the babies. Infants with subependymal-intraventricular hemorrhage, whether or not they received pancuronium or phenobarbital, had coefficients of variation comparable to those of babies without hemorrhage. Coefficient of variation values of the right were comparable to values obtained from the left anterior cerebral artery complex and did not appear to be consistently altered by the presence of subependymal-intraventricular hemorrhage. Coefficient of variation values appeared to be consistently greatest on day 1 and lowest on day 2. In addition, the values overall increased as the number of waves used to determine the coefficient of variation enlarged from five to 20. This phenomena, however, was not seen among pancuronium recipients and suggests that movement artifact may be a determinant of coefficient of variation values. We conclude that, when the best 20 waves are chosen to evaluate the coefficient of variation, no association exists between coefficient of variation values and development of subependymal-intraventricular hemorrhage or administration of phenobarbital.

Arthroscopic Removal of a Missed Wooden Foreign Body in the Metacarpophalangeal Joint

2021 ◽  
Author(s):  
Sotetsu Sakamoto ◽  
Kazuteru Doi ◽  
Yasunori Hattori ◽  
Sam Supreeth ◽  
Shichoh Sonezaki ◽  
...  
Keyword(s):  
Foreign Body ◽  
Range Of Motion ◽  
Full Range ◽  
Metacarpophalangeal Joint ◽  
Detailed Examination ◽  
Limited Range ◽  
Limited Range Of Motion ◽  
Wooden Foreign Body ◽  
Radiolucent Foreign Body ◽  
The Right

AbstractWe report a case of a missed wooden foreign body in the metacarpophalangeal (MP) joint of the right little finger following a workplace injury. The patient presented to our institution with a persisted pain and limited range of motion of the MP joint 1 week following the injury. Plain radiographs detected no foreign body or fractures. However, detailed examination as ultrasonography (USG) and computed tomography revealed the presence of a foreign body of 10 × 1.5 mm size in the MP joint capsule. The excision of the radiolucent foreign body was performed arthroscopically and was confirmed successful removal using intraoperative USG. The foreign body was recognized as a wooden piece. The patient was immediately pain free postoperatively and regained full range of motion. Arthroscopy can be a practical, reliable method to remove a radiolucent foreign body located in a small joint in a minimally invasive manner, and USG can help surgeons confirm no remnants left.

scholarly journals An Analysis of Full Range of Motion vs. Partial Range of Motion Training in the Development of Strength in Untrained Men

2004 ◽  
Vol 18 (3) ◽  
pp. 518-521
Author(s):  
Dwayne C. Massey ◽  
John Vincent ◽  
Mark Maneval ◽  
Melissa Moore ◽  
J. T. Johnson
Keyword(s):  
Range Of Motion ◽  
Full Range

scholarly journals Dynamic CT Scan of the Normal Scapholunate Joint in a Clenched Fist and Radial and Ulnar Deviation

Hand ◽  
2017 ◽  
Vol 13 (6) ◽  
pp. 666-670 ◽  
Author(s):  
Paul M. Kelly ◽  
John G. Hopkins ◽  
Andrew J. Furey ◽  
Daniel S. Squire
Keyword(s):  
Ct Scan ◽  
Range Of Motion ◽  
Ct Imaging ◽  
Dynamic Ct ◽  
Long Term Effects ◽  
Ulnar Deviation ◽  
Left Wrist ◽  
The Right ◽  
User Friendly

Background: Injuries to the scapholunate can have severe long-term effects on the wrist. Early detection of these injuries can help identify pathology. The purpose of this study was to evaluate the motions of the scapholunate joint in normal wrists in a clenched fist and through radial and ulnar deviation using novel dynamic computed tomography (CT) imaging. Methods: Fifteen participants below 40 years of age consented to have their wrist scanned. Eight participants were randomized to have the right wrist scanned and 7 the left wrist. Volunteers were positioned at the back of the gantry with the wrist placed on the table, palmar side down. Participants began with the hand in a relaxed fist position and then proceeded through an established range of motion protocol. Dynamic CT imaging was captured throughout the range of motion. Results: The movement in the healthy scapholunate joint through a clenched fist and radial and ulnar deviation is minimal. The averages were 1.19, 1.01, and 0.95 mm, representing the middle, dorsal, and volar measurements, respectively. Conclusions: This novel dynamic CT scan of the wrist is a user-friendly way of measuring of the scapholunate distance, which is minimal in the normal wrist below 40 years of age.

Effect of voluntary vs. artificial activation on the relationship of muscle torque to speed

1990 ◽  
Vol 69 (6) ◽  
pp. 2215-2221 ◽  
Author(s):  
G. A. Dudley ◽  
R. T. Harris ◽  
M. R. Duvoisin ◽  
B. M. Hather ◽  
P. Buchanan
Keyword(s):  
Knee Extensor ◽  
Voluntary Activation ◽  
Knee Extensors ◽  
Angular Velocities ◽  
The Central Nervous System ◽  
The Right ◽  
Artificial Activation ◽  
Relationship Of ◽  
The Relationship ◽  
Eccentric Actions

The speed-torque relationship of the right knee extensor muscle group was investigated in eight untrained subjects (28 +/- 2 yr old). Torque was measured at a specific knee angle during isokinetic concentric or eccentric actions at nine angular velocities (0.17-3.66 rad/s) and during isometric actions. Activation was by "maximal" voluntary effort or by transcutaneous tetanic electrical stimulation that induced an isometric torque equal to 60% (STIM 1) or 45% (STIM 2) of the voluntary isometric value. Torque increased (P less than 0.05) to 1.4 times isometric as the speed of eccentric actions increased to 1.57 rad/s for STIM 1 and STIM 2. Thereafter, increases in eccentric speed did not further increase torque. Torque did not increase (P greater than 0.05) above isometric for voluntary eccentric actions. As the speed of concentric actions increased from 0.00 to 3.66 rad/s, torque decreased (P less than 0.05) more (P less than 0.05) for both STIM 1 and STIM 2 (two-thirds) than for voluntary activation (one-half). As a result of these responses, torque changed three times as much (P less than 0.05) across speeds of concentric and eccentric actions with artificial (3.4-fold) than voluntary (1.1-fold) activation. The results indicate that with artificial activation the normalized speed-torque relationship of the knee extensors in situ is remarkably similar to that of isolated muscle. The relationship for voluntary activation, in contrast, suggests that the ability of the central nervous system to activate the knee extensors during maximal efforts depends on the speed and type of muscle action performed.

scholarly journals Recurrent anterior shoulder dislocation with glenoid fracture managed by modified Boytchev procedure: a rare case report

2019 ◽  
Vol 5 (5) ◽  
pp. 958
Author(s):  
Ashish Devgan ◽  
Umesh Yadav ◽  
Rajesh Rohilla ◽  
Pankaj Sharma ◽  
Varun Goel ◽  
...  
Keyword(s):  
Shoulder Dislocation ◽  
Full Range ◽  
Anterior Dislocation ◽  
Bone Block ◽  
Anterior Shoulder Dislocation ◽  
Glenoid Fracture ◽  
Rare Case Report ◽  
Muscle Actions ◽  
Recurrent Anterior Dislocation

<p class="abstract">Surgical procedures for recurrent anterior dislocation of the shoulder include using capsuloligamentous or bone blocks to create barriers and active interventions using muscle actions. Fracture of glenoid acts as a barrier for bone block procedures. Boytchev procedure, though outmoded, yet acts as simple and effective procedure in this condition. Here we report a 44 year old male with recurrent anterior dislocation with glenoid fracture treated by Boytchev procedure. The patient is on regular follow up since 3 years with no episode of shoulder dislocation till now with full range of movements. To conclude, Boytchev procedure is technically simple and effective method in patients with recurrent anterior shoulder dislocation with fracture of glenoid.</p>

scholarly journals Nonlinear analysis of fluctuations of microcirculation parameters in symmetrical organs of humans by laser doppler flowmetry

2019 ◽  
Vol 17 (4) ◽  
pp. 33-38 ◽  
Author(s):  
L. V. Mezentseva
Keyword(s):  
Nonlinear Dynamics ◽  
Blood Flow ◽  
Laser Doppler Flowmetry ◽  
Coefficient Of Variation ◽  
Correlation Dimension ◽  
The Body ◽  
Doppler Flowmetry ◽  
Average Value ◽  
Flow Fluctuations ◽  
The Right

Purpose– the study the nonlinear dynamics of microcirculation parameters in human symmetrical organs.Material and Methods. Parameters of microcirculation were measured in healthy volunteers (aged between 50 and 70 years) by means of laser Doppler flowmetry (LDF). LDF signal transducers were fixed symmetrically on the lower parts of the right and left shoulders (3 cm above the elbow bend). The degree of chaoticity of microcirculation parameters as a nonlinear dynamic process was estimated using Hausdorff’s index, relative entropy and characteristics of phase portraits. Along with components of the amplitude-and-frequency range for blood flow fluctuations (myogenic, neurogenic, respiratory, and cardiac) was estimated and correlations between all characteristics of microcirculation in both sides of the body were done.Results.Asymmetry of correlation relationships of nonlinear dynamics parameters and components of the amplitude-andfrequency range for blood flow fluctuations of right and left sides of the body was revealed. Hausdorff index in the left side correlated not only with the average value of perfusion and with the coefficient of variation in the same side (r1 = –0,68; r2 =–0,51), but also with correlation dimension of chaos in the opposite side (r=0,49). Similarly, entropy in the left side correlated not only with the average value of perfusion and coefficient of variation in the left (r1 =0,43; r2 =0,60), but also with the entropy and correlation dimension of chaos in the right side (r1 =0,48; r2 =–0,41). The neurogenic component in the left side positively correlated with the myogenic component in the same side (r=0,71). A positive correlation was observed between the neurogenic component in right side and myogenic component in the opposite side (r=0,57). Asymmetry of correlation relationships was also revealed for the respiratory and cardiac components.Conclusions. Our results illustrate the specific regulation of blood flow in micro vessels of paired organs, which is associated with functional asymmetry. The physiological mechanisms for this asymmetry require further experimental and clinical studies. 

Glycohaemoglobin: Comparison of 12 Analytical Methods, Applied to Lyophilized Haemolysates by 101 Laboratories in an External Quality Assurance Programme

1993 ◽  
Vol 30 (2) ◽  
pp. 169-174 ◽  
Author(s):  
Cas W Weykamp ◽  
Theo J Penders ◽  
Frits A J Muskiet ◽  
Willem van der Slik
Keyword(s):  
Quality Assurance ◽  
Acetic Acid ◽  
Coefficient Of Variation ◽  
External Quality Assurance ◽  
External Quality ◽  
Quality Assurance Programme ◽  
Coefficients Of Variation ◽  
Two Samples ◽  
The Mean ◽  
Edta Blood

Stable lyophilized ethylenediaminetetra-acetic acid (EDTA)-blood haemolysates were applied in an external quality assurance programme (SKZL, The Netherlands) for glycohaemoglobin assays in 101 laboratories using 12 methods. The mean intralaboratory day-to-day coefficient of variation (CV), calculated from the assay of 12 unidentified pairs over a period of 1 year, was 5·2% (range: 0·2–28·7). Forty-seven per cent of laboratories did not meet the criterion of CV < 5%, whereas 68% did not meet the clinically more desirable 3·3–3·6%. Linearity, as derived from the analysis of five combinations of two haemolysates with low and high glycohaemoglobin percentages over 6 months, was excellent (mean correlation coefficient 0·9953; range: 0·9188–0·9999). Analysis of two samples with high and low glycohaemoglobin percentages gave mean interlaboratory coefficients of variation of 10% for one method performed by several laboratories and 22% for all methods performed by all laboratories. It is concluded that the majority of laboratories do not meet the clinically desirable intralaboratory precision and that an unacceptably high interlaboratory precision exists.

scholarly journals A Simple and Inexpensive Management for Peroneus Longus Dislocation

2019 ◽  
Vol 7 (11_suppl6) ◽  
pp. 2325967119S0047
Author(s):  
Fahroni Cahyono Winata
Keyword(s):  
Range Of Motion ◽  
Ultrasound Examination ◽  
Full Range ◽  
Treatment Strategies ◽  
Sports Injury ◽  
Lateral Malleolus ◽  
Bone Flap ◽  
Convex Shape ◽  
Longus Tendon ◽  
Dynamic Ultrasound

Introduction: Peroneal longus dislocation is an uncommon sports injury and commonly misdiagnosed. Imaging measure includes plain radiography, ultrasonography, and MRI examination. Treatment strategies include controversial nonoperative treatment with a significant failure rate and several surgical procedures were reported. We reporting a chronic peroneal longus dislocation case in our hospital. Material and methods: Twenty-two years old male presented with a painful snapping lateral ankle suffered 3-month prior surgery. He played futsal and suddenly he felt popped on his ankle followed by pain and swelling. Dynamic ultrasound examination shows dislocation of peroneal longus tendon and convex shape of the retromalleolar groove. A five-centimeter long incision is made posterior to the lateral malleolus and during exploration we confirmed the ultrasound findings. We perform retromalleolar groove deepening by making bone flap medially, curette the cancellous bone and tamper back the bone flap, followed by superior peroneal retinaculum (SPR) reconstruction to the medial aspect of lateral cortex of the lateral malleolus to provide smooth gliding surface. We immobilize the ankle with a cast for six weeks for soft tissue healing. Result: After six weeks he can perform the almost full range of motion of the ankle without pain. Followed by further physiotherapy to regain full range of motion of the ankle. He returns to sport six months after surgery. Ultrasound examination shows the stability of the peroneal longus tendon. Conclusion: Dynamic ultrasound examination and retromalleolar groove deepening with SPR reconstruction are simple and inexpensive management for peroneal longus dislocation

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