期刊
NEUROSCIENCE RESEARCH
卷 52, 期 2, 页码 146-152出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.neures.2005.03.001
关键词
plantaris muscle; retrograde neuronal labeling; skeletal muscle fiber; soleus muscle; spinal motoneuron; succinate dehydrogenase activity
The effects of hyperbaric exposure with high oxygen concentration on spinal motoneurons and the skeletal muscle fibers that they innervate were investigated. Five-week-old male rats were exposed to a hyperbaric (1.25 atmospheric pressure) environment with a high oxygen concentration (35.0%) for 6 h daily. The number, cell body size, and oxidative enzyme activity of motoneurons innervating the soleus and plantaris muscles were examined after 8 weeks of hyperbaric exposure. In addition, the fiber type distribution, cell size, and oxidative enzyme activity of the slow soleus and fast plantaris muscles were examined. The oxidative enzyme activity of alpha motoneurons innervating the soleus and plantaris muscles increased after hyperbaric exposure, irrespective of their cell body sizes. The percentage of high-oxidative fibers in the soleus and plantaris muscles increased after hyperbaric exposure. The oxidative enzyme activity of all types of fibers in the soleus and plantaris muscles increased after hyperbaric exposure. It is concluded that hyperbaric exposure with high oxygen concentration enhances the oxidative capacity of neuromuscular units. (c) 2005 Elsevier Ireland Ltd and the Japan Neuroscience Society. All rights reserved.
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