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Accepted (AM)Open Access (License Unspecified), Open
Journal article
Non-uniform upregulation of the autogenic stretch reflex among hindlimb extensors following lateral spinal lesion in the cat
Experimental brain research, v 239(9), pp 2679-2691
01 Sep 2021
PMID: 34218298
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Successful propagation throughout the step cycle is contingent on adequate regulation of whole-limb stiffness by proprioceptive feedback. Following spinal cord injury (SCI), there are changes in the strength and organization of proprioceptive feedback that can result in altered joint stiffness. In this study, we measured changes in autogenic feedback of five hindlimb extensor muscles following chronic low thoracic lateral hemisection (LSH) in decerebrate cats. We present three features of the autogenic stretch reflex obtained using a mechanographic method. Stiffness was a measure of the resistance to stretch during the length change. The dynamic index documented the extent of adaptation or increase of the force response during the hold phase, and the impulse measured the integral of the response from initiation of a stretch to the return to the initial length. The changes took the form of variable and transient increases in the stiffness of vastus (VASTI) group, soleus (SOL), and flexor hallucis longus (FHL), and either increased (VASTI) or decreased adaptation (GAS and PLANT). The stiffness of the gastrocnemius group (GAS) was also variable over time but remained elevated at the final time point. An unexpected finding was that these effects were observed bilaterally. Potential reasons for this finding and possible sources of increased excitability to this muscle group are discussed.
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Details
- Title
- Non-uniform upregulation of the autogenic stretch reflex among hindlimb extensors following lateral spinal lesion in the cat
- Creators
- E Kajtaz - Georgia Institute of TechnologyL Montgomery - University of LouisvilleS McMurtry - Georgia Institute of TechnologyD Howland - Louisville VA Medical CenterNichols Richard
- Publication Details
- Experimental brain research, v 239(9), pp 2679-2691
- Publisher
- Springer Nature B.V
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physical Therapy (and Rehabilitation Sciences)
- Web of Science ID
- WOS:000669406900001
- Scopus ID
- 2-s2.0-85109280825
- Other Identifier
- 991021867304604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Neurosciences