NDLI: Effects of chronic electrical stimulation on long-term denervated muscles of the rabbit hind limb

Content Provider	Springer Nature Link
Author	Ashley, Zoe Salmons, Stanley Boncompagni, Simona Protasi, Felicia Russold, Michael Lanmuller, Hermann Mayr, Winfried Sutherland, Hazel Jarvis, Jonathan C.
Copyright Year	2007
Abstract	We investigated the extent to which activity induced by chronic electrical stimulation could restore the mass and contractile function of rabbit tibialis anterior (TA) muscles that had undergone atrophy as a result of prolonged denervation. Denervation was carried out by selectively interrupting the motor nerve branches to the ankle dorsiflexors in one hind limb. Stimulators were implanted, with electrodes on the superficial and deep surfaces of the denervated TA muscle. Ten weeks later, the mass and mid-belly cross-sectional area (CSA) of TA muscles subjected to denervation alone had fallen to approximately 40% of normal. At this stage, stimulators in the other rabbits were activated for 1 h/day to deliver 20-ms rectangular bipolar constant-current pulses of 4 mA amplitude at 20 Hz with a duty cycle of 1s ON/2s OFF, a total of 24,000 impulses/day. The animals were examined after a further 2, 6 or 10 weeks. Stimulation restored the wet weight of the denervated muscles to values not significantly different to those of normal, innervated controls. It increased CSA from 39% to 66% of normal, and there was a commensurate increase in maximum isometric tetanic force from 27% to 50% of normal. Light and electron microscopic examination revealed a marked improvement in the size, packing, and internal organization of the stimulated-denervated muscle fibres, suggestive of an ongoing process of restoration. Excitability, contractile speed, power, and fatigue resistance had not, however, been restored to normal levels after 10 weeks of stimulation. Similar results were found for muscles that had been denervated for 39 weeks and then stimulated for 12 weeks. The study demonstrates worthwhile benefits of long-term electrical stimulation in the treatment of established denervation atrophy.
Starting Page	203
Ending Page	217
Page Count	15
File Format	PDF
ISSN	01424319
Journal	Journal of Muscle Research & Cell Motility
Volume Number	28
Issue Number	4-5
e-ISSN	15732657
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-09-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Denervated muscle Electrical stimulation Rabbit Tibialis anterior muscle Implantable device Long-term Atrophy Physiology Light microscopy Electron microscopy Biomedicine general Animal Anatomy / Morphology / Histology Proteomics Cell Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Physiology Biochemistry

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