"Sensory partitioning" of cat medial gastrocnemius muscle by its muscle spindles and tendon organs.

Cameron, William E.; Binder, Marc D.; Botterman, B. R.; Reinking, Robert M.; Stuart, Douglas G.

doi:10.1152/jn.1981.46.1.32

Cited by 178 publications

(34 citation statements)

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“…3. Even in this large sample (n = 138) the correlation between the two variables is weak (r = 0-25; P < 0 005), confirming for tibialis posterior the observation made about tendon organs and motor units in studies of other cat muscles (Stauffer & Stephens, 1975;Reinking et al 1975;Jami & Petit, 1976a, b;Gregory & Proske, 1979;Houk et al 1980;Binder, 1981;Fukami, 1981;Cameron et al 1981). The correlation is still weak when only the spontaneously active receptors are included in the sample (n = 56; r= 0-32; P<0-02).…”

Section: Motor Unit-tendon Organ Interactionssupporting

confidence: 55%

Interactions between motor units and Golgi tendon organs in the tibialis posterior muscle of the cat.

Binder¹,

Osborn²

1985

The Journal of Physiology

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100

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SUMMARY1. The responses of Golgi tendon organs to single motor unit contractions were studied to determine whether receptors located in the same muscle region respond to a common set of motor units.2. In each of five experiments we isolated a large fraction (25-65 %) of the motor units of the cat tibialis posterior muscle and determined to which of the units each of several tendon organs was responsive. Each tendon organ was excited by from two to fifteen of the isolated motor units, including units which produced very small forces. However, there was a much greater probability for large force units to excite a given receptor than for small force units to do so.3. The number of motor units which produced either an 'unloading' or an 'off response' exceeded, on average, the number of motor units which excited the same tendon organ.4. The extent to which single motor units excited both of a pair of tendon organs was examined statistically in relation to the mutual proximity of the receptors within the muscle. It was found, on average, that the closer were two receptors, the greater was the number of motor units that excited both of them.5. These results suggest that despite the extensive territories of individual motor units, the spike trains of tendon organs may still encode information about localized muscle activity.

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Section: Motor Unit-tendon Organ Interactionssupporting

confidence: 55%

Interactions between motor units and Golgi tendon organs in the tibialis posterior muscle of the cat.

Binder¹,

Osborn²

1985

The Journal of Physiology

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100

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“…This could be related to increased inflammatory substances in the MTrPs, 9 leading to increased static fusimotor drive to muscle spindles or increased muscle spindle sensitivity. [20][21][22] Alternatively, the increased muscle spindle sensitivity at MTrPs may partly be related anatomically to the segregation of muscle spindles in the muscle and related sensory partitioning phenomenon. 22 …”

Section: Involvement Of H-reflex Pathway At Myofascial Mtrpsmentioning

confidence: 99%

“…[20][21][22] Alternatively, the increased muscle spindle sensitivity at MTrPs may partly be related anatomically to the segregation of muscle spindles in the muscle and related sensory partitioning phenomenon. 22 …”

Section: Involvement Of H-reflex Pathway At Myofascial Mtrpsmentioning

confidence: 99%

Increased H-Reflex Response Induced by Intramuscular Electrical Stimulation of Latent Myofascial Trigger Points

Serrao

Andersen

et al. 2009

Acupunct Med

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Background: Myofascial trigger points (MTrPs) present with mechanical hyperalgesia and allodynia. No electrophysiological evidence exists as to the excitability of muscle spindle afferents at myofascial trigger points MTrPs. The purpose of this current study was to explore whether an H-reflex response could be elicited from intramuscular electrical stimulation. If so, to assess the possibility of increased reflex response at MTrPs. Methods: The H-reflex latency and the conduction velocity were first determined from electrical stimulation of the tibial nerve in 13 healthy subjects. Then an intramuscular monopolar needle electrode was inserted randomly into a latent MTrP or a non-MTrP in the gastrocnemius muscle. Electrical stimuli at different intensities were delivered via the intramuscular recording electrode to the MTrP or non-MTrP. Results: The average conduction velocity (44.3 ¡ 1.5 m/s) of the electrical stimulation of tibial nerve was similar (p.0.05) with the conduction velocity (43.9 ¡ 1.4 m/s) of intramuscular electrical stimulation. The intramuscular H-reflex at MTrPs was higher in amplitude than non-MTrPs (p,0.001). The reflex threshold was lower for MTrPs than non-MTrPs (p,0.001). Conclusion:The current study provides first electrophysiological evidence that intramuscular electrical stimulation can evoke H-reflex, and that higher H-reflex amplitude and lower H-reflex threshold exist at MTrPs than non-MTrPs respectively, suggesting that muscle spindle afferents may be involved in the pathophysiology of MTrPs.

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“…The conduction velocity between MG or LG-Sol muscles and S 1 dorsal root was 92-103 m/s (Fig. 1A); in three fibers, the antidromic Ia spike was followed by early discharges (Cameron et al 1981;Granit et al 1959;Hunt and Kuffler 1951). The fibers ceased firing during the muscle twitch evoked by nerve stimulation (Fig.…”

Section: General Resultsmentioning

confidence: 95%

Gamma→Alpha Linkage and Persistent Firing of Ia Fibers by Pudendal Nerve Stimulation in the Decerebrate Cat

Raya

Ramirez²,

Muñoz-Martínez³

2004

Journal of Neurophysiology

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. The sensory pudendal nerve (SPN) was stimulated in decerebrate female cats. Spikes of single Ia muscle spindle afferents from the medial gastrocnemius (MG) muscle were recorded in dorsal root filaments. Electroneurography (ENG) was recorded in a cut nerve filament to the MG muscle; MG electromyography (EMG) was also recorded. Single shock to SPN induced discharges of small ENG spikes (SS) with similar amplitude to that of gamma spikes elicited by ventral root stimulation. Thus SS were identified as gamma spikes. The latency of the gamma discharge was ϳ15 ms. As expected, the onset of the gamma discharge preceded a discharge of Ia spikes; the time difference between both discharges was ϳ5 ms. After the initial bursts, the Ia and the gamma activities paused during 20 -30 ms but later increased again to last ϳ1 s. After the shock, the EMG activity was depressed during ϳ50 ms; later, motor-unit spikes may show transient activation. Thus the onset of the gamma activation preceded the activation of motor units (gamma3alpha link). Trains of shocks (1 or 100 Hz) to SPN induced a sustained increase in the frequency of gamma spikes, Ia spikes, and motor units that outlasted the train by 20 -120 s. The sustained firing of Ia fibers might trigger or help to trigger and maintain the response of alpha-motoneurons.

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"Sensory partitioning" of cat medial gastrocnemius muscle by its muscle spindles and tendon organs.

Cited by 178 publications

References 0 publications

Interactions between motor units and Golgi tendon organs in the tibialis posterior muscle of the cat.

Interactions between motor units and Golgi tendon organs in the tibialis posterior muscle of the cat.

Increased H-Reflex Response Induced by Intramuscular Electrical Stimulation of Latent Myofascial Trigger Points

Gamma→Alpha Linkage and Persistent Firing of Ia Fibers by Pudendal Nerve Stimulation in the Decerebrate Cat

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