Details

Autor(en) / Beteiligte

• Kouzaki, Karina
• Kobayashi, Masatoshi
• Nakamura, Kei-Ichiro
• Ohta, Keisuke
• Nakazato, Koichi

Titel

Repeated bouts of fast eccentric contraction produce sciatic nerve damage in rats

Ist Teil von

• Muscle & nerve, 2016-11, Vol.54 (5), p.936-942

Ort / Verlag

United States: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Quelle

MEDLINE

Beschreibungen/Notizen

• 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