期刊
MUSCLE & NERVE
卷 41, 期 5, 页码 685-693出版社
WILEY
DOI: 10.1002/mus.21549
关键词
electrical stimulation nerve injury; neuromuscular impairment; rehabilitation; skeletal muscle
资金
- Italian Ministry of Education, University and Research (MIUR)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [06/52931-4, 08/05237-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [08/05237-0] Funding Source: FAPESP
Neuromuscular recovery after peripheral nerve lesion depends on the regeneration of severed axons that re-establish their functional connection with the denervated muscle. The aim of this study was to determine the effects of electrical stimulation (ES) on the neuromuscular recovery after nerve crush injury in rats. Electrical stimulation was carried out on the tibialis anterior (TA) muscle after sciatic nerve crush injury in a rat model. Six ES sessions were administered every other day starting from day 3 postinjury until the end of the experiment (day 14). The sciatic functional index was calculated. Muscle excitability, neural cell adhesion molecule (NCAM) expression, and muscle fiber cross-sectional area (CSA) were accessed from TA muscle. Regenerated sciatic nerves were analyzed by light and confocal microscopy. Both treated (crush+ES) and untreated (crush) groups had their muscle weight and CSA decreased compared with the normal group (P < 0.05). Electrical stimulation accentuated muscle fiber atrophy more in the crush+ES than in the crush group (P < 0.05). N-CAM expression increased in both crush and crush+ES groups compared with the normal group (P < 0.05). Regenerated nerves revealed no difference between the crush and crush+ES groups. Nevertheless, functional recovery at day 14 post-injury was significantly lower in crush+ES group compared with the crush group. In addition, the crush+ES group had chronaxie values significantly higher on days 7 and 13 compared with the crush group, which indicates a decrease in muscle excitability in the crush+ES animals. The results of this study do not support a benefit of the tested protocol of ES during the period of motor nerve recovery following injury. Muscle Nerve 41: 685-693, 2010
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