scholarly journals Effects of stretch on dynamic fusimotor after-effects in cat muscle spindles.

1985 ◽  
Vol 360 (1) ◽  
pp. 201-213 ◽  
Author(s):  
F Emonet-Dénand ◽  
C C Hunt ◽  
Y Laporte
Keyword(s):  
Muscle Spindles ◽  
After Effects

Aftereffects in the responses of cat muscle spindles

1986 ◽  
Vol 56 (2) ◽  
pp. 451-461 ◽  
Author(s):  
J. E. Gregory ◽  
D. L. Morgan ◽  
U. Proske
Keyword(s):  
Quantitative Measure ◽  
Muscle Spindles ◽  
Testing Procedure ◽  
Muscle Afferents ◽  
Ventral Root ◽  
Initial Length ◽  
After Effects ◽  
Intrafusal Fibers ◽  
Muscle Changes ◽  
Afferent Response

Responses have been recorded from primary endings of muscle spindles in the cat soleus muscle. Changes in spindle responsiveness were measured following a period of conditioning that consisted of a series of rapid stretches or of tetanic ventral root stimulation. In the testing procedure the response of a single spindle afferent was recorded to stimulation of a dynamic fusimotor axon during a slow stretch. Changes in gross afferent discharge coming from the muscle were measured by integrating the activity recorded in dorsal roots. If, after conditioning stretches, the muscle was immediately returned to its initial length, the spindle responded to the test fusimotor stimulation with a high-frequency burst of afferent impulses. If the muscle was held stretched for 3 s after conditioning the response to the brief test tetanus was small or "depressed." It has been suggested that conditioning stretches result in detachment of stable crossbridges in intrafusal fibers and that these bridges then reform over the next few seconds at whatever length the muscle happens to have at the time. When it is long, shortening the muscle back to the initial length leads to the development of slack in intrafusal fibers because of the passive stiffness they have acquired from the presence of the stable bridges. Under these conditions a brief test fusimotor tetanus will lead to a depressed response because the slack must first be taken up before a full response can be generated. It was possible to reverse the depression by interposing an extrafusal contraction during the period between the conditioning and test sequences. It is suggested that lateral compression from the contracting extrafusal fibers and the stretch they impose as they relax reduces any intrafusal slack and thereby reduces the depression. A more quantitative measure of intrafusal slack than the test for depression is to determine the delay in onset of the afferent response to a longer fusimotor tetanus. The delay was short a long initial muscle lengths where, if the muscle was left undisturbed, it soon disappeared completely and spontaneously. It is suggested that at long lengths passive tension in the muscle tends to remove any slack in intrafusal fibers and therefore removes any after effects. The rise in resting discharge of muscle afferents after a conditioning tetanus applied to the ventral root ("postcontraction sensory discharge") can be accounted for by the same hypothesis.(ABSTRACT TRUNCATED AT 400 WORDS)

scholarly journals Is the Focal Muscle Vibration an Effective Motor Conditioning Intervention? A Systematic Review

2021 ◽  
Vol 6 (2) ◽  
pp. 39
Author(s):  
Luigi Fattorini ◽  
Angelo Rodio ◽  
Vito E. Pettorossi ◽  
Guido M. Filippi
Keyword(s):  
Mechanical Vibration ◽  
Stimulus Frequency ◽  
Muscle Spindles ◽  
Long Term Effects ◽  
Time Analysis ◽  
Muscle Belly ◽  
After Effects ◽  
Motor Conditioning ◽  
Short And Long Term

Mechanical vibration, applied to single or few muscles, can be a selective stimulus for muscle spindles, able to modify neuromuscular management, inducing short and long-term effects, are now mainly employed in clinic studies. Several studies reported as treatments with focal vibratory (FVT) can influence neuromuscular parameters also in healthy people. However, the application modalities and the consequent effects are remarkably fragmented. This paper aims to review these studies and to characterize the FVT effectiveness on long-term conditional capacities in relation to FVT characteristics. A systematic search of studies published from 1985 to 2020 in English on healthcare databases was performed. Articles had to meet the following criteria: (1) treatment based on a locally applied vibration on muscle belly or tendon; (2) healthy adults involved; (3) outcomes time analysis enduring for more than 24 h. Twelve studies were found, all of them presented an excellent quality score of ≥75%. All selected papers reported positive changes, comparable with traditional long-lasting training effects. Muscle force and power were the most investigated parameters. The after-effects persisted for up to several months. Among the different FV administration modalities, the most effective seems to show a stimulus frequency of ≈100 Hz, repeated more times within three-five days on a voluntary contracted muscle.

AFTER EFFECTS OF EC-DECAY57Co - LABELLED TRIS (OXINATO) COBALT (III) AND TRIS (β-DIKETONATO) COBALT( I I I )

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-420-C2-422 ◽  
Author(s):  
K. Endo ◽  
M. Harada ◽  
Y. Sakai ◽  
H. Sano
Keyword(s):  
After Effects

Absence of Muscle Spindles in Human Facial Muscles

2004 ◽  
Vol 35 (03) ◽  
Author(s):  
PP Urban ◽  
J Bohl ◽  
L Abrao ◽  
E Stofft
Keyword(s):  
Muscle Spindles ◽  
Facial Muscles
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