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观察了游泳耐力训练后大鼠脊髓前角外侧群细胞的超微结构变化，发现此群运动神经元线粒体的数量明显地增多，嵴致密，基质电子密度增高。但未见线粒体肿胀、嵴断裂和空泡化等变性现象。用体视学方法测量了线粒体的数密度和比表面。训练组和对照组大鼠前角细胞线粒体的数密度分别为０．６７５±０．１９个／μｍ~３和０．４４５±０．０４个／μｍ~３（Ｐ＜０．０５），比表面分别为６．３５±０．１７μｍ~２μｍ~（－３）和６．６４±０．１８μｍ~２μｍ~（－３）（Ｐ＜０．０２）。据此提出，耐力训练可引起前角细胞的超微结构变化。
We observed the ultrastructural changes of lateral spinous cells in the spinal cord anterior horn after swimming endurance training and found that the number of mitochondria of motor neurons in this group increased significantly, the crest became dense and the electron density of matrix increased. However, no mitochondrial swelling, cristae and vacuolar degeneration and other phenomena. Mitochondrial number density and specific surface area were measured by stereological methods. The number density of mitochondria in anterior horn of rats in training and control groups were 0.675 ± 0.19 / μm ~ 3 and 0.445 ± 0.04 / μm ~ 3 (P <0.05), respectively The surface area was 6.35 ± 0.17μm ~ 2μm ~ (-3) and 6.64 ± 0.18μm ~ 2μm ~ (-3) respectively (P <0.02). It is suggested that endurance training can cause anterior horn cells ultrastructural changes.