1971 Volume 16 Issue 2 Pages 67-74
The purpose of this study was to inquire histologically the relative effects of static training and dynamic training upon skeletal muscle fibers by making a distinction between red muscle fibers and white muscle fibers. The experimental animals, Wistar-strain rats, formed two experimental groups and performed muscular training exercises. Static training group was made to sustain one's body sticking at a tree for one hour a day and 6 days out of a week for a period of 40 days. Dynamic training group was compelled to run on the treadmill with a speed of 40 m/min., a distance of 250m, and 6 days out of a week for 40 days. Rats of the same venter were used as the control group. The histological method, using Sudan black B stain, was adopted. The results obtained were as follows: (1) The weight of each muscle of the rats' lower limbs increased in static and dynamic training groups.(2) In static training group, the increasing rate of the entire area of cross section of red muscle fibers in M. tibialis ant. was 15.0 %, and that of white muscle fibers was 11.1 %. In dynamic training group, the increasing rate of the entire area of cross section of red muscle fibers was 13.2 %, and that of white muscle fibers was 19.4 %. (3) The effect of training on the average area of cross section per fiber showed the same tendency as the effect of training on the entire area of cross section in static in and dynamic training groups.