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J Appl Physiol 82: 732-737, 1997;
8750-7587/97 $5.00
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Journal of Applied Physiology
Vol. 82, No. 3, pp. 732-737, March 1997
EXERCISE AND MUSCLE

Time course of recovery from nerve injury in skeletal muscle: energy state and local circulation

Yoshihiro Hayashi1, Takaaki Ikata1, Hiroaki Takai1, Shinjiro Takata1, Takayuki Sogabe2, and Keiko Koga2

1 Department of Orthopedic Surgery, School of Medicine, University of Tokushima 770; and 2 Tokushima Research Institute, Otsuka Pharmaceutical Co., Ltd., Tokushima 771-01, Japan

Received 12 March 1996; accepted in final form 12 November 1996.

Hayashi, Yoshihiro, Takaaki Ikata, Hiroaki Takai, Shinjiro Takata, Takayuki Sogabe, and Keiko Koga. Time course of recovery from nerve injury in skeletal muscle: energy state and local circulation. J. Appl. Physiol. 82(3): 732-737, 1997.---This study examined the time course of recovery from nerve injury on energy state assessed by phosphorus-31 magnetic resonance spectroscopy and local circulation dynamics by fluorine-19 magnetic resonance spectroscopy in skeletal muscles of rats. The hindlimb muscles that had undergone unilateral sciatic nerve compression for 2 wk (CN) were compared with sham-operated (SO) muscles and with muscles that had the compression removed after 2 wk and were allowed to recover for 4 wk (R4) or for 6 wk (R6). The energy state and local circulation dynamics of CN muscles were less than those of SO muscles (P < 0.01). The energy state of R4 muscles remained at levels similar to CN muscles, whereas the local circulation dynamics improved but not back to SO values. In R6 muscles, both parameters returned to SO values. These results showed that the recovery processes of circulation precede those of energy state in skeletal muscles.

phosphorus-31 magnetic resonance spectroscopy; fluorine-19 magnetic resonance spectroscopy

0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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