In order to explore the effect of the loading condition of weights on static and dynamic equilibrium, observation and analysis were performed a) body sway on upright stance and rapid arm push, b) balancing time on a laterally rotatable balancing board in a standing posture, and c) moving length and degree of revolution on the stepping test (with eyes closed). Loading was achieved by giving weight were loading (10, 20 or 30% of body weight) to both hands (2H), a hand (1H), a shoulder (1S), back (B) or top of the head (Hd). The values measured were compared with the respective ones of the no loading condition (NL).
　The results obtained were as follows ;
　1 ) In any loading conditions of the 1H, the 1S, and the ,B with 10%, the values of the area (ABS) and the total shift length (LBS) of the body sway on the upright stance, and the balancing time on the rotatable balance board were not signicifantly different from the respective values of the NL.
　2 ) The values of the LBS for the 1H (P<0.05), the 1 S (P<0.05) and the Hd (P<0.01) with 20%, and the ABS for the 1S (P<0.01) and the Hd (P<0.01) with 20% on the upright stance were significantly greater than the respective values of the NL.
　3 ) The peak amplitude of the forward sway on the rapid arm push at the loading condition of the B with 20% were significantly smaller (P<0.01) than that of the NL.
　4 ) Some examples of the moving length and the degree of revolution on the stepping test at the B with 10% and 30% were also smaller than those of the NL, although no statistical analysis was made.

DESCENTE SPORTS SCIENCE Vol.16/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE