成熟期中期のラット足底筋に対するジャンプトレーニングの影響

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  • セイジュクキ チュウキ ノ ラット ソクテイキン ニ タイスル ジャンプトレーニング ノ エイキョウ
  • The Effects of Jumping Training on the Rat Plantaris Muscle in the Middle Period of Mature

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We studied the effects of jumping training in 15 mature female Fischer 344 rats (12 month old). The animals were divided into two groups: sedentary (S; n = 7) or jumping (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. After 8-weeks of training， the plantaris muscle (PLA) was isolated， and crude myosin was extracted. Myosin heary chain (MyHC) isoform composition was analyzed by sodium dodecyl sulfate polyaclylamidegel electrophoresis. The final body weights of each group were not significantly different. PLA weight and relative PLA weight of the J group were significantly higher than those of the S group. While no statistical difference was found in the compositions of the MyHC I， IId and IIa isoforms in either group. However， the value of the type IIb MyHC isoform in the J group was relatively lower than that in the S group. These results indicated that the MyHC isoform composition of the PLA muscle changed with jumping training. We conclude that jumping training during the middle stage of maturation affected the muscle contractile protein phenotype.

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