Rapid spinal mechanisms of motor coordination

Exercise and Sport Sciences Reviews

Volumn 27, Issue , 1999, Pages 255-284

  Nichols, T Richard ^a   Cope, Timothy C ^a   Abelew, Thomas A ^a  

^a NONE

Author keywords

[No Author keywords available]

Indexed keywords

ANIMAL; EVOKED MUSCLE RESPONSE; FEEDBACK SYSTEM; HUMAN; INNERVATION; JOINT; LOCOMOTION; MOTONEURON; MOTOR PERFORMANCE; MUSCLE CONTRACTION; MUSCLE SPINDLE; MYOTATIC REFLEX; PHYSIOLOGY; PROPRIOCEPTION; REACTION TIME; REFLEX RECRUITMENT; REVIEW; SKELETAL MUSCLE; SPINAL CORD;

ANIMALS; EVOKED POTENTIALS, MOTOR; FEEDBACK; HUMANS; JOINTS; LOCOMOTION; MOTOR NEURONS; MOTOR SKILLS; MUSCLE CONTRACTION; MUSCLE SPINDLES; MUSCLE, SKELETAL; PROPRIOCEPTION; REACTION TIME; RECRUITMENT, NEUROPHYSIOLOGICAL; REFLEX, STRETCH; SPINAL CORD;

EID: 0033290956     PISSN: 00916331     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (128)

1. Abelew, T.A. Contributions made by the medial gastrocnemius, lateral gastrocnemius and plantaris muscles to the knee joint moment and to the flow of mechanical energy through the lower limb of freely moving cats. Doctoral Dissertation, UCLA, Los Angeles, CA, 1995.
2. Abelew, T.A., C.M.J.I. Huyghues-Despointes, and T.R. Nichols. Three dimensional knee torques produced by the quadriceps and hamstrings muscles in the cat. Soc. Neurosci. Abstr. 22:2042, 1996.
3. Abelew, T.A., M.D. Miller, C.M.J.I. Huyghues-Despointes, and T.R. Nichols. Disruption of interjoint coordination during ramp locomotion in self-reinnervated cats. Soc. Neurosci. Abstr. 23:760, 1997.
4. Abraham, L.D., and G.E. Loeb. The distal hindlimb musculature of the cat. Patterns of normal use. Exp. Brain Res. 58:580-593, 1985.
5. Baldissera, F., H. Hultborn, and M. Illert. Integration in spinal neuronal systems. V.B. Brooks (ed.). Handbook of Physiology. The Nervous System, Motor Control, part 1. Bethesda:American Physiological Society, 1981, pp. 509-595.
6. Bawa, P., M. Binder, P. Ruenzel, and E. Henneman. Recruitment order of motoneurons in stretch reflexes is highly correlated with their axonal conduction velocity. J. Neurophysiol. 52:410-420, 1984.
7. Binder, M.D., P. Bawa, P. Ruenzel, and E. Henneman. Does orderly recruitment of motoneurons depend on the existence of different types of motor units? Neurosci. Lett. 36:55-58, 1983.
8. Binder, M.D., C.J. Heckman, and R.K. Powers. The physiological control of motoneuron activity. L.B. Rowell and J.T. Shepard (eds.). Handbook of Physiology, Section 12. Exercise: Regulation and Integration of Multiple Systems. New York:Oxford University Press, 1996, pp. 3-53.
9. Bizzi, E., N. Hogan, F.A. Mussa-Ivaldi, and S. Giszter. Does the nervous system use equilibrium-point control to guide single and multiple joint movements? Behav. Brain Sci. 15:603-613, 1992.
10. Bodine, S.C., R.R. Roy, D.A. Meadows, R.F. Zernicke, R.D. Sacks, M. Fournier, and R.V. Edgerton. Architectural histochemical and contractile characteristics of a unique biarticular muscle: the cat semitendinosus. J.Neurophysiol. 48:192-201, 1982.
11. Bonasera, S.J., and T.R. Nichols. Mechanical actions of heterogenic reflexes linking long toe flexors and extensors of the knee and ankle in the cat. J. Neurophysiol. 71:1096-1110, 1994.
12. Bonasera, S.J., and T.R. Nichols. Mechanical actions of heterogenic reflexes among ankle stabilizers and their interactions with plantarflexors of the cat hindlimb. J. Neurophysiol. 75:2050-2070, 1996.
13. Burke, R.E. Motor units: Anatomy, physiology and functional organization. V.B. Brooks (ed.). Handbook of Physiology. The Nervous System, Motor Control, part I. Bethesda:American Physiological Society, 1981, pp. 345-422.
14. Burke, R.E., W.Z. Rymer, and J.V. Walsh Jr. Relative strength of synaptic input from short-latency pathways to motor units of defined type in cat medial gastrocnemius. J. Neurophysiol. 39:447-458, 1976.
15. Calancie, B., and P. Bawa. Motor unit recruitment in humans. M.D. Binder and L.M. Mendell (eds.). The Segmental Motor System. New York:Oxford University Press, 1990, pp. 75-95.
16. Capaday, C., and R.B. Stein. Amplitude modulation of the soleus H-reflex in the human during walking and standing. J. Neurosci. 6:1308-1313, 1986.
17. Carter, R.R., P.E. Crago, and P.H. Gorman. Nonlinear stretch reflex interaction during cocontraction. J. Neurophysiol. 69:943-952, 1993.
18. Carter, R.R., P.E. Crago, and M.W. Keith. Stiffness regulation by reflex action in the normal human hand. J. Neurophysiol. 64:105-118, 1990.
19. Chanaud, C.M., and J.M. Macpherson. Functionally complex muscles of the cat hindlimb III: differential activation within biceps femoris during postural perturbations. Exp. Brain Res. 271-280, 1991.
20. Chanaud, C.M., C.A. Pratt, and G.E. Loeb. Functionally complex muscles of the cat hindlimb II: mechanical and architectural heterogeneity within the biceps femoris. Exp. Brain Res. 85:257-270, 1991.
21. Chin, N.K., M. Cope, and M. Pang. Number and distribution of spindle capsules in seven hindlimb muscles of the cat. D. Barker (ed.). Symposium on Muscle Receptors. Hong Kong:Hong Kong University Press, 1962, pp. 241-248.
22. Collins, W.F., L.M. Mendell, and J.B. Munson. On the specificity of sensory reinnervation of cat skeletal muscle. J. Physiol. 375:587-609, 1986.
23. Cope, T.C., S.J. Bonasera, and T.R. Nichols. Reinnervated muscles fail to produce stretch reflexes. J. Neurophysiol. 71:817-820., 1994.
24. Cope, T.C., and B.D. Clark. Motor-unit recruitment in the decerebrate cat: several unit properties are equally good predictors of order. J. Neurophysiol. 66:1127-1138, 1991.
25. Cope, T.C., and B.D. Clark. Motor-unit recruitment in self-reinnervated muscle. J. Neurophysiol. 70:1787-1796, 1993.
26. Cope, T.C., K.R. Hickman, and B.R. Botterman. Acute effects of spinal transsection on EPSPs produced by single homonymous Ia fibres in soleus motoneurons in the cat. J.Neurophysiol. 60:1678-1694, 1988.
27. Cope, T.C., A.J. Sokoloff, S.M. Dacko, R. Huot, and E. Feingold. Stability of motor-unit force threshold in the decerebrate cat. J. Neurophysiol. 78:3077-3082, 1997.
28. Crago, P.E., J.C. Houk, and W.Z. Rymer. Sampling of total muscle force by tendon organs. J.Neurophysiol. 47:1069-1083, 1982.
29. Crone, C., H. Hultborn, B. Jespersen, and J. Nielsen. Reciprocal Ia inhibition between ankle flexors and extensors in man. J. Physiol. 389:163-185, 1987.
30. Crouch, J.E. Text-Atlas of Cat Anatomy. Philadelphia:Lea and Febiger. 1969.
31. Dacko, S.M., A.J. Sokoloff. and T.C. Cope. Recruitment of triceps surae motor units in the decerebrate cat: I. independence of type S units in soleus and medial gastrocnemius muscles. J. Neurophysiol. 75:1997-2004, 1996.
32. Dietz, V., and W. Berger. Normal and impaired regulation of muscle stiffness in gait a new hypothesis about muscle hypertonia. Exp. Neurol. 79:680-687, 1983.
33. Duysens, J., A.A.M. Tax, B.vander Doelen, M. Trippel, and V. Dietz. Selective activation of human soleus or gastrocnemius in reflex responses during walking and running. Exp. Brain Res. 87:193-204, 1991.
34. Eccles, J.C. Presynaptic inhibition in the spinal cord. J.C. Eccles and J.P. Schade (eds.). Physiology of Spinal Neurons, Progress in Brain Research. Amsterdam:Elsevier, 1964, pp. 65-91.
35. Eccles, J.C., R.M. Eccles, and A. Lundberg. The convergence of monosynaptic excitatory afferents on to many different species of alpha motoneurons. J. Physiol. 137:22-50, 1957.
36. Eccles, J.C., R.M. Eccles, and A. Lundberg. Synaptic actions on motoneurons caused by impulses in the Golgi tendon organ afferents. J. Physiol. 138:227-252, 1957.
37. Eccles, J.C., R.M. Eccles, C.N. Shealey, and W.D. Willis. Experiments utilizing monosynaptic excitatory action on motoneurons for testing hypothesis relating to specificity of neuronal connections. J. Neurophysiol. 25:559-580, 1962.
38. Eccles, J.C., P. Fatt, and S. Landgren. The central pathway for the direct inhibitory action of impulses in the largest afferent nerve fibers to muscle. J. Neurophysiol. 19:75-98, 1956.
39. Eccles, R.M., and A. Lundberg. Integrative pattern of Ia synaptic actions on motoneurons of hip and knee muscles. J. Physiol. 144:271-298, 1958.
40. Edgley, S., E. Jankowska, and D. McCrea. The heteronymous monosynaptic actions of triceps surae group Ia afferents on hip and knee extensor motoneurones in the cat. Exp. Brain. Res. 61:443-446, 1986.
41. English, A.W., and O.I. Weeks. An anatomical and functional analysis of cat biceps femoris and semitendinosus muscles. J. Morph. 191:161-175, 1987.
42. Enoka, R.M. Eccentric contractions require unique activation strategies by the nervous system. J. Appl. Physiol. 81:2339-2346, 1996.
43. Feldman, A.G. Superposition of motor programs: I. rhythmic forearm movements in man. Neuroscience 5:81-90, 1980.
44. Feldman, A.G., and M.F. Levin. The origin and use of positional frames of reference in motor control. Behav. Brain Sci. 18:723-806, 1995.
45. Fowler, E.G., R.J. Gregor, J.A. Hodgson, and R.R. Roy. Relationship between ankle muscle and joint kinetics during the stance phase of locomotion in the cat. J. Biomech. 26:465-483, 1993.
46. Fulton, J.F. Muscular Contraction and the Reflex Control of Movement. Baltimore:Williams & Wilkins, 1926.
47. Gandevia, S.C. Kinesthesia: roles for afferent signals and motor commands. L.B. Rowell and J.T. Shepherd (eds.). Handbook of Physiology. Section 12: Exercise: Regulation and Integration of Multiple Systems. New York:Oxford University Press, 1996, pp. 128-172.
48. Ghez, C., J. Gordon, M.F. Ghilardi, and R. Sainburg. Contributions of vision and proprioception to accuracy in limb movements. M.S. Gazzaniga (ed.). The Cognitive Neurosciences. Cambridge:MIT Press, 1995, pp. 549-564.
49. Gielen, C.C.A., L. Ramaekers, and E.J. van Zuylen. Long-latency stretch reflexes as coordinated functional responses in man. J.Physiol. 407:275-292, 1988.
50. Griffiths, R.I. Shortening of muscle fibres during stretch of the active cat medial gastrocnemius muscle: the role of tendon compliance. J. Physiol. 436:219-236, 1991.
51. Guertin, P., M. Angel, M.C. Perreault, and D.A. McCrea. Ankle extensor group I afferents excite extensors throughout the hindlimb during MLR-evoked fictive locomotion in the cat. J. Physiol. 487:197-209, 1995.
52. Hagbarth, K.E. Excitatory and inhibitory skin areas for flexor and extensor motoneurons. Acta Physiol. Scand. Suppl. 94:1-58, 1952.
53. Hamm, T.M. Recurrent inhibition to and from motoneurons innervating the flexor digitorum and flexor hallucis longus muscle of the cat. J. Neurophysiol. 63:395-403, 1990.
54. Hayward, L., D. Breitback, and W.Z. Rymer. Increased inhibitory effects on close synergists during muscle fatigue in the decerebrate cat. Brain Res. 44:199-203, 1988.
55. Heckman, C.J., and M.D. Binder. Analysis of effective synaptic currents generated by homonymous Ia afferent fibers in motoneurons of the cat. J. Neurophysiol. 60:1946-1966, 1988.
56. Heckman, C.J., and M.D. Binder. Computer simulations of the effects of different synaptic input systems on motor unit recruitment. J. Neurophysiol. 70:1827-1840, 1993.
57. Henneman, E., and L.M. Mendell. Functional organization of motoneuron pool and its inputs. V.B. Brooks (ed.). Handbook of Physiology. The Nervous System, Motor Control, part 1. Bethesda:American Physiological Society, 1981, pp. 423-508.
58. Herzog, W., T.R. Leonard, and A.C.S. Guimaraes. Forces in gastrocnemius, soleus, and plantaris tendons of the freely moving cat. J. Biomech. 26:945-953, 1993.
59. Hoffer, J.A., and S. Andreassen. Regulation of soleus muscle stiffness in premammillary cat intrinsic and reflex components. J.Neurophysiol. 45:267-285, 1981.
60. Hoffer, J.A., A.A. Caputi, I.E. Pose, and R.I. Griffiths. Roles of muscle activity and load on the relationship between muscle spindle length and whole muscle length in the freely walking cat. Prog. Brain Res. 80:75-85, 1989.
61. Hoffer, J.A., G.E. Loeb, N. Sugano, W.B. Marks, M.J. O'Donovan, and C.A. Pratt. Cat hindlimb motoneurons during locomotion. III. Functional segregation in sartorius. J. Neurophysiol. 57:554-562, 1987.
62. Hogan, N. The mechanics of multi-joint posture and movement control. Biol. Cybern. 52:315-331, 1985.
63. Houk, J.C. The phylogeny of muscular control configurations. J.C. Houk (ed.). Biocybernetics IV. Jena:Fischer, 1972, pp. 125-144.
64. Houk, J.C. Regulation of stiffness by skeletomotor reflexes. Ann. Rev. Physiol. 41:99-114, 1979.
65. Houk, J.C., and E. Henneman. Responses of Golgi tendon organs to active contractions of the soleus muscle of the cat. J. Neurophysiol. 30:466-481, 1967.
66. Houk, J.C., and E. Henneman. Feedback control of muscle: introductory concepts. V.B. Mountcastle (ed.). Medical Physiology. St. Louis:C.V. Mosby, 1974, pp. 668-677.
67. Houk, J.C., J.J. Singer, and M.R. Goldman. An evaluation of length and force feedback to soleus muscles of decerebrate cats. J. Neurophysiol. 33:784-811, 1970.
68. Hultborn, H. Transmission in the pathway of reciprocal Ia inhibition to motoneurons and its control during the tonic stretch reflex. S. Homma (ed.). Progress in Brain Research. Amsterdam:Elsevier, 1976, pp. 235-255.
69. Hultborn, H., M. Illert, and M. Santini. Convergence on interneurons mediating the reciprocal Ia inhibition of motoneurons II: effects from segmental flexor pathways. Acta Physiol. Scand. 96:351-367, 1976.
70. Humphrey, D.R., and D.J. Reed. Separate cortical systems for control of joint movement and joint stiffness: reciprocal activation and coactivation antagonist muscles. J.E. Desmedt (ed.). Advances in Neurology. New York:Raven Press, 1983, pp. 347-372.
71. Hutchison, D.L., R.R. Roy, J.A. Hodgson, and E. V.R. EMG amplitude relationships between the rat soleus and medial gastrocnemius during various motor tasks. Brain Res. 502:233-244, 1989.
72. Huyghues-Despointes, C.M.J.I., T.C. Cope, and T.R. Nichols. Intrinsic properties of cat triceps surae muscles in posture and locomotion. Soc. Neurosci. Abstr. 23:761, 1997.
73. Jami, L. Golgi tendon organs in mammalian skeletal muscle: functional properties and central actions. Physiol. Rev. 72:623-666, 1992.
74. Jankowska, E. Interneuronal relay in spinal pathways from proprioceptors. Prog. Neurobiol. 38:335-378, 1992.
75. Joyce, G.C., P.M.H. Rack, and D.R. Westbury. The mechanical properties of cat soleus muscle during controlled lengthening and shortening movements. J. Physiol. 204:461-474, 1969.
76. Kirsch, R.F., D. Boskov, and W.Z. Rymer. Muscle stiffness during transient and continuous movements of cat muscle: perturbation characteristics and physiological relevance. IEEE Trans. Biomed. Eng. 41:758-770, 1994.
77. Koshland, G.F., Z. Hasan, and L. Gerilovsky. Activity of wrist muscles elicited during imposed or voluntary movements about the elbow joint. J. Motor Behav. 23:91-100, 1991.
78. Lawrence, J.H., III, T.R. Nichols, and A.W. English. Cat hindlimb muscles exert substantial torques outside the sagittal plane. J. Neurophysiol. 69:282-285, 1993.
79. Liddell, E.G.T., and C.S. Sherrington. Reflexes in response to stretch (myotatic reflexes). Proc. Roy. Soc. 96:212-242, 1924.
80. Lloyd, D.P.C. Neuron patterns controlling transmission of ipsilateral hind limb reflexes in the cat. J. Neurophysiol. 6:293-315, 1943.
81. Lloyd, D. P.C. Facilitation and inhibition of spinal motoneurons. J. Neurophysiol. 9:421-438, 1946.
82. Lloyd, D.P.C. Integrative pattern of excitation and inhibition in two-neuron reflex arcs. J. Neurophysiol. 9:439-444, 1946.
83. Macpherson, J.M. Strategies that simplify the control of quadrupedal stance I forces at the ground. J. Neurophysiol. 6:204-217, 1988.
84. Macpherson, J.M. Strategies that simplify the control of quadrupedal stance II: electromyographic activity. J. Neurophysiol. 60:218-231, 1988.
85. Malamud, J.G., R.E. Godt, and T.R. Nichols. Relationship between short-range stiffness and yielding in type-identified, chemically skinned muscle fibers from the cat triceps surae muscles. J. Neurophysiol. 76:2280-2289, 1996.
86. Matthews, P.B.C. Mammalian Muscle Receptors and Their Central Actions. P.B.C. Matthews (ed.). Baltimore:Williams and Wilkins, 1972.
87. McCrea, D.A. Spinal cord circuitry and motor reflexes. Exerc. Sport Sci. Rev. 14:105-141, 1986.
88. McCrea, D.A. Can sense be made of spinal interneuron circuits? Behav. Brain Sci. 15:633-643, 1992.
89. Merton, P.A. Speculations on the servo-control of movement. G.E.W. Wolstenholme (ed.). The Spinal Cord. London:Churchill, 1953, pp. 247-255.
90. Munson, J.B., J.W. Fleshman, and G.W. Sypert. Properties of single-fiber spindle group II EPSPs in triceps surae motoneurons. J. Neurophysiol. 44:713-725, 1980.
91. Mussa-Ivaldi, F.A., N. Hogan, and E. Bizzi. Neural, mechanical and geometric factors subserving arm posture in humans. J. Neurosci. 5:2732-2743, 1985.
92. Nichols, T.R. The organization of heterogenic reflexes among muscles crossing the ankle joint in the decerebrate cat. J. Physiol. 410:463-477, 1989.
93. Nichols, T.R. A biomechanical perspective on spinal mechanisms of coordinated muscular action: an architecture principle. Acta Anat. 151:1-13, 1994.
94. Nichols, T.R. Receptor mechanisms underlying heterogenic reflexes among the triceps surae muscles of the cat. J. Neurophysiol. (in press).
95. Nichols, T.R., and J.C. Houk. The improvement in linearity and regulation of stiffness that results from action of the stretch reflex. J. Neurophysiol. 39:119-142, 1976.
96. Nichols, T.R., and D. Koffler-Smulevitz. Mechanical analysis of heterogenic inhibition between soleus muscle and the pretibial flexors in the cat. J. Neurophysiol. 66:1139-1155, 1991.
97. O'Donovan, M.J., M.J. Pinter, R.P. Dum, and R.E. Burke. Actions of FDL and FDL muscle in intact cats: functional dissociation between anatomical synergists. J.Neurophysiol. 47:1126-1143, 1982.
98. O'Donovan, M.J., M.J. Pinter, R.P. Dum, and R.E. Burke. Kinesiological studies of self-and cross-reinnervated FDL and soleus muscles in freely moving cats. J. Neurophysiol. 54:852-866, 1985.
99. Pearson, K.G. Proprioceptive regulation of locomotion. Curr. Biol. 5:786-791, 1995.
100. Pearson, K.G., and D.F. Collins. Reversal of the influence of group Ib afferents from plantans on activity in medial gastrocnemius muscle during locomotor activity. J. Neurophysiol. 70:1009-1017, 1993.
101. Petit, J., G.M. Filippi, F. Emonet-Denand, C.C. Hunt, and Y. Laport. Changes in muscle stiffness produced by motor units of different types in peroneus longus muscle of the cat. J. Neurophysiol. 63:190-197, 1990.
102. Powers, R.K., and M.D. Binder. Distribution of oligosynaptic group 1 input to the cat medial gastrocnemius motoneuron pool. J. Neurophysiol. 53:497-517, 1985.
103. Pratt, C.A., C.M. Chanaud, and G.E. Loeb. Functionally complex muscles of the cat hindlimb IV: intramuscular distribution of movement command signals and cutaneous reflexes in broad, bifunctional thigh muscles. Exp. Brain Res. 85:281-299, 1991.
104. Pratt, C.A., and G.E. Loeb. Functionally complex muscles of cat hindlimb: I. patterns of activation across sartorius. Exp. Brain Res. 85:243-256, 1991.
105. Prochazka, A. Ensemble inputs to a-motoneurons during movement. R. Dengler (ed.). The Motor Unit: Physiology, Diseases and Regeneration. Munich:Urban, R. Schwarzenberg, 1990, pp. 32-42.
106. Prochazka, A. Proprioceptive feedback and movement regulation. L.B. Rowell and J.T. Shepard (eds.). Handbook of Physiology, Section 12. Exercise: Regulation and Integration of Multiple Systems. New York:Oxford University Press, 1996, pp. 89-121.
107. Prochazka, A., D. Gillard, and D.J. Bennett. Implications of positive feedback in the control of movement. J. Neurophysiol 77:3237-3251, 1997.
108. Prochazka, A., D. Gillard, and D.J. Bennett. Positive force feedback control of muscles. J. Neurophysiol 77:3226-3236, 1997.
109. Rudomin, P. Presynaptic control of synaptic effectiveness of muscle spindle and tendon organ afferents in the mammalian spinal cord. M.D. Binder and L.M. Mendell (eds.). The Segmental Motor System. New York:Oxford University Press, 1990, pp. 348-380.
110. Rymer, W.Z., and Z. Hasan. Absence of force-feedback regulation in soleus of the decerebrate cat. Brain Res. 184:203-209, 1980.
111. Scott, J.G., and L.M. Mendell. Individual EPSPs produced by single triceps surae Ia afferent fibers in homonymous and heteronymous motoneurons. J. Neurophysiol. 39:679-692, 1976.
112. Sherrington, C.S. Reflex inhibition as a factor in the coordination of movements and postures. Q.J. Exp. Physiol. 6:251-310, 1913.
113. Sinkjaer, T. Muscle, reflex and central components in the control of the ankle joint in healthy and spastic man. Acta Neurol. Scand. 96:1-28, 1997.
114. Sinkjaer, T., J. Nielsen, and E. Toft. Mechanical and electromyographic analysis of reciprocal inhibition at the human ankle joint. J. Neurophysiol. 74:849-855, 1995.
115. Sokoloff, A.J., and T.C. Cope. The size principle of motor unit recruitment crosses muscle boundaries. Soc. Neurosci. Abstr. 20:337, 1995.
116. Sokoloff, A.J., and T.C. Cope. Recruitment of triceps surae motor units in the decerebrate cat: II. Heterogeneity among soleus motor units. J. Neurophysiol. 75:2005-2016, 1996.
117. Sokoloff, A.J., T.C. Cope, T.R. Nichols, and A.W. English. Directions of torques produced about the ankle joint by cat medial gastrocnemius motor units. Motor Control 1:340-353, 1997.
118. Stein, R.B., and R. Bertoldi. The size principle: a synthesis of neurophysiological data. J.E. Desmedt (eds.). Progress in Clinical Neurophysiology. Motor Unit Types, Recruitment and Plasticity in Health and Disease. Basel:Karger, 1981, pp. 85-96.
119. ter Haar Romeny, B.M., J.J. Denier van der Gon, and C.C.A.M. Gielen. Relation between location of a motor unit in the human biceps brachii and its critical firing levels for different tasks. Exp. Neurol. 85:631-650, 1984.
120. Thomas, C.K., B.H. Ross, and R.B. Stein. Motor-unit recruitment in human first dorsal interosseous muscle for static contraction in three different directions. J. Neurophysiol. 55:1017-1029, 1986.
121. Tilney, F., and F.H. Pike. Muscular coordination experimentally studied in its relation to the cerebellum. Arc. Neurol. & Psychiat. 13:289-334, 1925.
122. Trank, T.V., and J.L. Smith. Adaptive control for backward quadrupedal walking. VI. metatarsophalangeal joint dynamics and motor patterns of digit muscles. J. Neurophsyiol. 75:678-694, 1996.
123. Turkin, V.V., K.S. Monroe, and T.M. Hamm. Organization of recurrent inhibition and facilitation in motor nuclei innervating ankle muscles of the cat. J. Neurophysiol. 79:778-790, 1998.
124. Walmsley, B., J.A. Hodgson, and R.E. Burke. Forces produced by medial gastrocnemius and soleus muscles during locomotion in freely moving cats. J. Neurophysiol. 41:1203-1216, 1978.
125. Webb, C.B., and T.C. Cope. Influence of synaptic identity on single-Ia-afferent connectivity and EPSP amplitude in the adult cat: homonymous vs heteronymous connections. J. Neurophysiol. 68:1046-1052, 1992.
126. Whiting, W.C., R.J. Gregor, R.R. Roy, and V.R. Edgerton. A technique for estimation of mechanical work of individual muscles in the cat during treadmill locomotion. J. Biomech. 17:685-694, 1984.
127. Wilmink, R.J.H., C.M.J.I. Huyghues-Despointes, T.A. Abelew, and T.R. Nichols. Non-uniform distribution of neural feedback among the quadriceps and triceps surae muscles of the cat. Soc. Neurosci. Abstr. 22:2042, 1996.
128. Wilmink, R.J.H., C.M.J.I. Huyghues-Despointes, and T.R. Nichols. Gastrocnemius muscles provide a major source of interjoint force feedback in the cat hindlimb. Soc. Neurosci. Abstr. 23:200, 1997.