ジャンプトレーニング並びに持久走トレーニングによるラット下肢骨及び骨格筋の発達変化とその関連性

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The exercise that bones are subjected to the load is effective in bone mass increase. The aim of our study was to examine the relationship between tibia and plantaris muscle developments in endurance-running-trained and jump-trained rat. Five week-old rats were running-trained and jump-trained for 8 weeks for 6 days/week. The speed of treadmill running progressively increased to 35 m/min. The height of jumping progressively also increased to 40 cm. Histomorphometric analyses were performed on longitudinal sections of proximal tibial metaphyseal secondary spongiosa. We also measured the contractile properties in plantaris muscle. Eight weeks of endurance running and jump training increased tibial weight and trabecular bone volume. The trainings also increased weight and maximal tension in plantaris muscle. A trabecular bone thickness increased only jump trained rats. The bone weight correlated with body weight (r=0689, p<0.01) and plantaris muscle weight (r=0.909, p<0.001). The trabecular bone area ratio correlated with maximal tension of the plantaris muscle (r=0.486, p<0.05). These results suggest that the quantitative and functional development of plantaris muscle induced by jump training and endurance running training associated with a tibial quantitative and structural development. Contractive force of the plantaris muscle increased by training loads proximal metaphysis of tibia as mechanical stress, and developed trabecular bone architecture.
2012-07-20

ジャンプトレーニング並びに持久走トレーニングによるラット下肢骨及び骨格筋の発達変化とその関連性

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