The effects of high-power training by means of a bicycle ergometer were examined on the sprint ability and such important factors of physical fitness as agility, strength and power. Seven non-athlete male university students aged 19-21 years were engaged in the high-power training program consisted of the maximum pedaling with the work load of 60 percent maximum pedaling force for 6 (twice) and 12 (thrice) seconds, 3 times a week, for a period of 10 weeks. The time used for running 50 meters and 100 meters, step efficiency while sitting on a chair, back-lift strength, leg extension strength, leg flexion strength, vertical jump height and power output measured though a bicycle ergometer were all recorded before and after the training for each subject.
　Results were summarized as follows:
1) Training effect was significant in 50 meter and 100 meter sprint records (p<0.01, respectively).
2) No significant change was found in a test for agility, ie, stepping efficiency while sitting on a chair.
3) Remarkably large training effects were found in back-lift strength (p<0.05), leg extension strength (right leg: p<0.05, left leg: p<0.01) and leg flexion strength (right and left legs: p<0.05, respectively).
4) Training effects were significant in the ergometric power exerted under all work loads (3 kp: p<0.05, 4, 5 and 6 kp: p<0.01, respectively, 7 kp: p<0.001). Little significant effect was found on maximum height in the vertical jump.
　These results suggest that the high-power training by means of the work load of 60 percent maximum pedaling force of a bicycle ergometer is effective in order to improve the sprint ability in ordinary youths.

DESCENTE SPORTS SCIENCE Vol.2/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE