The experiment was designed to investigate the training effect, detraining effect, and trainability of a selected agility-training exercise; full speed-stepping (FSS) in sitting position.
　The school children, 7-12 years of age, were divided into 2 groups. One of the groups (Training group) was given the 10 second-FSS as an agility-training, once and 3 times a day alternately, during the period of first 15 days (First training period) and of second 15 days (Second training period). They were rested from their training for 2 weeks between the first and second training periods. The other group (Control group) was not given the training for the FSS.
　The training group was superior to the control group in the FSS ability (times of FSS/10 sec) in any one of the ages and sexes. The trainability to the FSS increased with age in the boys, but did not in the girls. The 2 week-rest (Detraining) caused no change of the FSS ability.

DESCENTE SPORTS SCIENCE Vol.3/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE