回転車輪の自発走により誘発される筋損傷とトレーニング効果

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Voluntarily wheel running exercise is thought to be one of the most effective exercise training protocol for skeletal muscle developments. On the other hand, however, the voluntarily running exercise-induced muscle damage in rat hindlimbs has also been proposed. In this study, female Fischer 344 rats at the age of 4 weeks old were exercised voluntarily on a wheel or motor-driven treadmill for 10 weeks totally, and the muscle damage and the training effects in plantaris muscles were examined histochemically. The proportion of muscle fibers those have a centrally located a nuclei are three times and two times higher in the voluntarily running exerise group compared to the sedentary control and the motor-driven treadmill running exercise geoups, respectively. The results suggest that the voluntarily wheel running exercise caused the muscle damage more severely compared with the motor-driven treadmill running exercise. A type IIa fiber composition increased significantly in the treadmill running exercise group, and an increase of type I fiber composition is more prominent in voluntarily running exercise group. Changes in a knee- and an ankle-joints angle during voluntarily wheel running were also examined. The rat was frequently running at a part of rearward of the wheel, and the joint movements during the running were correspondent to those of a downhill running. We found a specific phase to be bent of the ankle joint and fixed of the knee joint between a toe contact and weighting phase during the wheel running, and the plantaris muscle seems to be stretched at this specific pahse. In conclusion, the voluntarily whool running exercise caused a muscle damage consistent with the case of downhill running exercise in rat hindlimb, and affected the transformation of muscle fiber types.
日本運動生理学会の論文
2000-09-30

回転車輪の自発走により誘発される筋損傷とトレーニング効果

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