Kouzaki K, Kobayashi M, Nakamura KI, Ohta K, Nakazato K. Repeated bouts of fast eccentric contraction produce sciatic nerve damage in rats.
Muscle Nerve 2016;
54:936-942. [PMID:
26994356 DOI:
10.1002/mus.25110]
[Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 03/08/2016] [Accepted: 03/16/2016] [Indexed: 11/08/2022]
Abstract
INTRODUCTION
We evaluated sciatic nerve impairment after eccentric contractions (ECs) in rat triceps surae.
METHODS
Wistar rats were randomly assigned to different joint angular velocity: 180°/s (FAST), 30°/s (SLOW), or nontreated control (CNT). FAST and SLOW groups were subjected to multiple (1-4) bouts of 20 (5 reps, 4 sets) ECs. Nerve conduction velocity (NCV) and isometric tetanic ankle torque were measured 24 h after each ECs bout. We also assessed nerve morphology.
RESULTS
After 4 ECs bouts, NCVs and isometric torque in the FAST group were significantly lower than those in the CNT (NCV: 42%, torque: 66%; P < 0.05). After 4 bouts, average nerve diameter was significantly smaller in the FAST group [2.39 ± 0.20 μm vs. 2.69 ± 0.20 μm (CNT) and 2.93 ± 0.24 μm (SLOW); P < 0.05] than that in other two groups.
CONCLUSIONS
Chronic ECs with high angular velocity induce serious nerve damage. Muscle Nerve 54: 936-942, 2016.
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