1. Electrogoniogram of the elbow and cinematograph were simultaneously recorded during the forward-upward circling at the low horizontal bar. 34 school children of both sexes ranging in age from 10 to 12 years including ten children who have acquired the skill were employed as subjects.
　The important teaching points of the forward-upward circling, obtained through this experiment were as follows:
(1) Let them raise their waist to the bar as closely as possible before both feet taking off the floor.
(2) Let them start to rotate their shoulders backward just before both feet taking off the floor, and as soon as both feet taking off the floor, rotate backward positively.
(3) The over-hand grip is more advantageous than the under-hand grip for the following two reasons.
　One is that it helps the children to make their waist close to the bar more easily.
　The other is that it helps to keep his shoulders in higher position, so that the backward rotation of the shoulders can be performed in the biggest arc.
2. The supporting belt made on an experimental basis consists of the cloth that cover the hip, the nylon belt that connect the cloth with the bar to keep the body close to the bar, and the buckeles that connect the nylon belts at both sides of the cloth.
　While the supporting belt is used, the knees of the children are allowed to flex and extend more vigorously during the forward, backward and forward-upward circlings. This motion is supposed to be very effective for increasing the rotational speed.
　We conducted a small experiment in class to find some imprications of this result for teaching. Elementary school children (44) were taught how to use supporting belts (20) at the low horizontal bar. They were told to use the belt whenever necessary. It turned out that they used the belts for forward circling most frequently. Next came backward circling. The belts were least used for forward-upward circling.
　The impressions of the children after the class were as follows:
　About 70% of them had no fear during the rotation when they use the supporting belt.
　More than 80% of them showed interest in the supporting belt and expressed their desire to use the belts even when they are not in class.
　And 90% of them wanted to get more chance for using the belt.

DESCENTE SPORTS SCIENCE Vol.10/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE