ラットヒラメ筋に対する降下時の衝撃吸収動作を伴うジャンプトレーニングの影響

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  • Effects of jump training with shock-absorbing action during descent on rat soleus muscle

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We studied the effects of jump training in 15 mature female Fischer 344 rats (12 month old). The animals were divided into two groups: sedentary (S; n = 7) or jump (J; n = 8) group. The animals in the J group were trained with vertical jumps (40 cm high, 100 repetitions/day, 5 days/week) for 8 weeks. This training involves a movement similar to so-called “stepping” to absorb the impact of a fall. The rat’s　body sinks while the rat’s lower limbs exert muscle force. This causes the lower limb skeletal muscles to become eccentric. After 8-weeks of training, the soleus muscle (SOL) was isolated, and crude myosin was extracted. Myosin heavy chain (MyHC) isoform composition was analyzed by sodium dodecyl sulfate polyaclylamidegel electrophoresis. The final body weights of each group were not significantly different. SOL weight of the J group was　not significantly higher than those of the S group. Relative SOL weight of the J group was significantly higher than those of the S group. The value of the type I MyHC isoform in the J group was relatively　lower than that of the S group. On the contrary, the value of the type IIa MyHC isoform in the J group was relatively higher than that of the S group.These results indicated that the MyHC isoform composition of the SOL muscle changed with jump training with shock-absorbing action during descent.

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