Excitation of Renshaw cells by orthodromic group Ia volleys following vibration of extensor muscles

1974 ◽  
Vol 347 (2) ◽  
pp. 137-144 ◽  
Author(s):  
O. Pompeiano ◽  
P. Wand ◽  
K. -H. Sontag
Keyword(s):  
Renshaw Cells ◽  
Extensor Muscles

Influence of Renshaw cells on the response gain of hindlimb extensor muscles to sinusoidal labyrinth stimulation

1985 ◽  
Vol 404 (2) ◽  
pp. 107-118 ◽  
Author(s):  
O. Pompeiano ◽  
P. Wand ◽  
U. C. Srivastava
Keyword(s):  
Renshaw Cells ◽  
Extensor Muscles ◽  
Labyrinth Stimulation

Treatment of vertebral fractures due to osteoporosis

2015 ◽  
Vol 24 (01) ◽  
pp. 7-10 ◽  
Author(s):  
M. Pfeifer ◽  
M. Sinaki
Keyword(s):  
Exercise Program ◽  
Therapeutic Exercise ◽  
Training Support ◽  
Axial Stability ◽  
Extensor Muscles ◽  
Therapeutic Exercises ◽  
Increase Risk ◽  
Risk Of Falls ◽  
Risk Of Fall

SummaryThe objective of exercise in the treatment of osteoporosis is to improve axial stability through strengthening of back extensor muscles. Therefore, a back extension exercise program specific to one’s musculoskeletal competence and pain can be performed in a sitting position and later advanced to the prone position. When fragility is resolved, back extension is performed against resistance applied to the upper back. A significant reduction in back pain, kyphosis, and risk of falls and an improvement in the level of physical activity have been achieved through the SPEED (Spinal Proprioceptive Extension Exercise Dynamic) program. In addition, the application of a “Posture Training Support” (PTS) using a backpack may decrease kyphosis and pain related not only to compression fractures but also reduce iliocostal friction. Therapeutic exercise should address osteo - porosis-related deformities of axial posture, which can increase risk of fall and fracture. Thus, the role of a therapeutic exercise program is to increase muscle strength safely, decrease immobility-related complications, and prevent fall and fracture. As with pharmacotherapy, therapeutic exercises are individualized.

257. Electromyographic Activity of Forearm Flexors and Extensor Muscles from Typing on Negatively Sloped Computer Keyboards

2000 ◽  
Author(s):  
R. Marklin ◽  
G. Simoneau ◽  
D. Cahaya
Keyword(s):  
Electromyographic Activity ◽  
Extensor Muscles

Properties of Renshaw cells excited by recurrent collaterals of pudendal motoneurons in the cat

2009 ◽  
Vol 65 ◽  
pp. S167
Author(s):  
Ken Muramatsu ◽  
Masatoshi Niwa ◽  
Kenji Sato ◽  
Sei-Ichi Sasaki
Keyword(s):  
Renshaw Cells ◽  
Recurrent Collaterals

scholarly journals Exhausting repetitive piano tasks lead to local forearm manifestation of muscle fatigue and negatively affect musical parameters

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Etienne Goubault ◽  
Felipe Verdugo ◽  
Justine Pelletier ◽  
Caroline Traube ◽  
Mickaël Begon ◽  
...  
Keyword(s):  
Muscle Fatigue ◽  
Sound Intensity ◽  
Musical Performance ◽  
Fundamental Aspect ◽  
Central Feature ◽  
Median Frequency ◽  
Piano Performance ◽  
Bipolar Electrodes ◽  
Right Hand ◽  
Extensor Muscles

AbstractMuscle fatigue is considered as a risk factor for developing playing-related muscular disorders among professional pianists and could affect musical performance. This study investigated in 50 pianists the effect of fatiguing repetitive piano sequences on the development of forearm muscle fatigue and on piano performance parameters. Results showed signs of myoelectric manifestation of fatigue in the 42-electromyographic bipolar electrodes positioned on the forearm to record finger and wrist flexor and extensor muscles, through a significant non-constant decrease of instantaneous median frequency during two repetitive Digital (right-hand 16-tones sequence) and Chord (right-hand chords sequence) excerpts, with extensor muscles showing greater signs of fatigue than flexor muscles. In addition, muscle fatigue negatively affected key velocity, a central feature of piano sound intensity, in both Digital and Chord excerpts, and note-events, a fundamental aspect of musicians’ performance parameter, in the Chord excerpt only. This result highlights that muscle fatigue may alter differently pianists’ musical performance according to the characteristics of the piece played.

Measuring the force perception in knee flexor/ extensor muscles in patients with anterior cruciate ligament injury and healthy subjects

2021 ◽  
pp. 1-8
Author(s):  
Bahram Amirshakeri ◽  
Minoo Khalkhali Zavieh ◽  
Mandana Rezaei ◽  
Hakimeh Adigozali
Keyword(s):  
Anterior Cruciate Ligament ◽  
Healthy Subjects ◽  
Cruciate Ligament ◽  
Acl Injury ◽  
Injured Limb ◽  
Knee Flexor ◽  
Force Perception ◽  
Extensor Muscles ◽  
Anterior Cruciate ◽  
Flexion And Extension

BACKGROUND: Force perception as a contributor to the neuromuscular control of the knee joint may be altered after anterior cruciate ligament (ACL) injury. OBJECTIVE: This study aimed to compare the force perception accuracy in the knee joints of patients with ACL injury and healthy subjects. METHODS: Twenty-six patients with ACL injury and 26 healthy subjects participated in this case-control study. Participants were asked to produce 50% of the maximum voluntary isometric contraction of the knee muscles as a target force and reproduce it in their limbs in flexion and extension directions. RESULTS: There were significant interactions between group and condition as well as group, condition, and limb in the force perception error respectively (P< 0.05). The highest amount of error was seen in the contralateral limb of the ACL injury group when the reference force was produced in the injured limb (P< 0.05). CONCLUSION: The findings revealed that the force perception accuracy in the knee flexor/extensor muscles of individuals with ACL injury is impaired. Moreover, error is most evident when the patient produces force in the injured limb and replicates it in the uninjured limb in both flexion and extension directions. Therefore, the rehabilitation programs should encompass neuromuscular training in both quadriceps and hamstrings after ACL injury.

Support for a linear length-tension relation of the torso extensor muscles: An investigation of the length and velocity EMG-force relationships

1996 ◽  
Vol 29 (12) ◽  
pp. 1597-1604 ◽  
Author(s):  
Ulrich Raschke ◽  
Don B. Chaffin
Keyword(s):  
Extensor Muscles

Intraarticular corticosteroid injection into rheumatoid arthritis knees improves extensor muscles strength

1990 ◽  
Vol 9 (6) ◽  
pp. 265-270 ◽  
Author(s):  
P. Geborek ◽  
B. M�nsson ◽  
F. A. Wollheim ◽  
U. Moritz
Keyword(s):  
Rheumatoid Arthritis ◽  
Corticosteroid Injection ◽  
Extensor Muscles

Plasticity in the Distribution of the Red Nucleus Output to Forearm Muscles After Unilateral Lesions of the Pyramidal Tract

2000 ◽  
Vol 83 (5) ◽  
pp. 3147-3153 ◽  
Author(s):  
Abderraouf Belhaj-Saïf ◽  
Paul D. Cheney
Keyword(s):  
Pyramidal Tract ◽  
Red Nucleus ◽  
Emg Activity ◽  
Motor Impairments ◽  
Forearm Muscles ◽  
Extensor Muscles ◽  
Flexor Muscles ◽  
Lesion Method ◽  
Stimulus Triggered Averaging ◽  
Suppression Effects

It has been hypothesized that the magnocellular red nucleus (RNm) contributes to compensation for motor impairments associated with lesions of the pyramidal tract. To test this hypothesis, we used stimulus triggered averaging (StTA) of electromyographic (EMG) activity to characterize changes in motor output from the red nucleus after lesions of the pyramidal tract. Three monkeys were trained to perform a reach and prehension task. EMG activity was recorded from 11 forearm muscles including one elbow, five wrist, and five digit muscles. Microstimulation (20 μA at 20 Hz) was delivered throughout the movement task to compute StTAs. Two monkeys served as controls. In a third monkey, 65% of the left pyramidal tract had been destroyed by an electrolytic lesion method five years before recording. The results demonstrate a clear pattern of postlesion reorganization in red nucleus–mediated output effects on forearm muscles. The normally prominent extensor preference in excitatory output from the RNm (92% in extensors) was greatly diminished in the lesioned monkey (59%). Similarly, suppression effects, which are normally much more prominent in flexor than in extensor muscles (90% in flexors), were also more evenly distributed after recovery from pyramidal tract lesions. Because of the limited excitatory output from the RNm to flexor muscles that normally exists, loss of corticospinal output would leave control of flexors particularly weak. The changes in RNm organization reported in this study would help restore function to flexor muscles. These results support the hypothesis that the RNm is capable of reorganization that contributes to the recovery of forelimb motor function after pyramidal tract lesions.

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