JN Journal of Neurophysiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Neurophysiol 39: 1090-1104, 1976;
0022-3077/76 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Prochazka, A.
Right arrow Articles by Ziccone, S. P.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Prochazka, A.
Right arrow Articles by Ziccone, S. P.

Journal of Neurophysiology, Vol 39, Issue 5 1090-1104, Copyright © 1976 by APS

ARTICLES

Discharges of single hindlimb afferents in the freely moving cat

A. Prochazka, R. A. Westerman and S. P. Ziccone

1. Implanted semimicroelectrodes were used to record single afferent fiber discharges from L7 dorsal roots during unrestrained walking in the conscious cat. 2. A series of tests were used to identify an afferent during a short period of anesthesia following each recording session. The majority of afferents were from muscle spindle primary endings in hindlimb muscles. 3. Ankle extensor spindle primaries generally showed their highest firing rates during that phase of stepping in which they were passively stretched. During active muscle contraction there was evidence of fusimotor drive, although this was not usually sufficient to entirely overcome the unloading effect of rapid muscle shortening. The variability of firing rate from cycle to cycle was considerably greater for the phase of active muscle contraction. The EMG response to brisk stretches of the ankle extensor muscle indicated a rapid (disynaptic or trisynaptic) reflex arc in the conscious animal. 4. Knee flexor spindle primaries showed similarly higher firing rates during passive muscle stretching in the step cycle. The shorter periods of presumed alpha-gamma coactivation corresponded to the much more phasic role of these muscles in stepping. 5. Tendon organs in the physiological extensors of the toes were mainly active during stance, although some discharges were usually seen during the swing phase. It is suggested that previous experiments on mesencephalic preparations may have led to an exaggerated view of the degree of alpha-gamma coactivation during normal stepping movements.


This article has been cited by other articles:


Home page
 J. Physiol.Home page
G. Courtine, S. J. Harkema, C. J. Dy, Y. P. Gerasimenko, and P. Dyhre-Poulsen
Modulation of multisegmental monosynaptic responses in a variety of leg muscles during walking and running in humans
J. Physiol., August 1, 2007; 582(3): 1125 - 1139.
[Abstract] [Full Text] [PDF]

Home page
 Integr. Comp. Biol.Home page
C. F. Ross, A. Eckhardt, A. Herrel, W. L. Hylander, K. A. Metzger, V. Schaerlaeken, R. L. Washington, and S. H. Williams
Modulation of intra-oral processing in mammals and lepidosaurs
Integr. Comp. Biol., July 1, 2007; 47(1): 118 - 136.
[Abstract] [Full Text] [PDF]

Home page
 J. Physiol.Home page
A. Taylor, R. Durbaba, P. H. Ellaway, and S. Rawlinson
Static and dynamic {gamma}-motor output to ankle flexor muscles during locomotion in the decerebrate cat
J. Physiol., March 15, 2006; 571(3): 711 - 723.
[Abstract] [Full Text] [PDF]

Home page
 Physiol. Rev.Home page
S. Rossignol, R. Dubuc, and J.-P. Gossard
Dynamic Sensorimotor Interactions in Locomotion
Physiol Rev, January 1, 2006; 86(1): 89 - 154.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
S. Yakovenko, V. Mushahwar, V. VanderHorst, G. Holstege, and A. Prochazka
Spatiotemporal Activation of Lumbosacral Motoneurons in the Locomotor Step Cycle
J Neurophysiol, March 1, 2002; 87(3): 1542 - 1553.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
P. R. Murphy
Tonic and Phasic Discharge Patterns in Toe Flexor gamma -Motoneurons During Locomotion in the Decerebrate Cat
J Neurophysiol, January 1, 2002; 87(1): 286 - 294.
[Abstract] [Full Text] [PDF]

Home page
 J. Gerontol. A Biol. Sci. Med. Sci.Home page
G. R. Chalmers and K. M. Knutzen
Soleus Hoffmann-Reflex Modulation During Walking in Healthy Elderly and Young Adults
J. Gerontol. A Biol. Sci. Med. Sci., December 1, 2000; 55(12): 570B - 579.
[Abstract] [Full Text]

Home page
 Physiol. Rev.Home page
J. Duysens, F. Clarac, and H. Cruse
Load-Regulating Mechanisms in Gait and Posture: Comparative Aspects
Physiol Rev, January 1, 2000; 80(1): 83 - 133.
[Abstract] [Full Text] [PDF]

Home page
 BrainHome page
L. R. Wilson, S. C. Gandevia, J. T. Inglis, J.-M. Gracies, and D. Burke
Muscle spindle activity in the affected upper limb after a unilateral stroke
Brain, November 1, 1999; 122(11): 2079 - 2088.
[Abstract] [Full Text] [PDF]

Home page
 ScienceHome page
S Grillner
Neurobiological bases of rhythmic motor acts in vertebrates
Science, April 12, 1985; 228(4696): 143 - 149.
[Abstract] [PDF]

Home page
 ScienceHome page
J. Hoffer, M. O'Donovan, C. Pratt, and G. Loeb
Discharge patterns of hindlimb motoneurons during normal cat locomotion
Science, July 24, 1981; 213(4506): 466 - 467.
[Abstract] [PDF]

Home page
 ScienceHome page
G. Loeb, M. Bak, and J Duysens
Long-term unit recording from somatosensory neurons in the spinal ganglia of the freely walking cat
Science, September 16, 1977; 197(4309): 1192 - 1194.
[Abstract] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online