(1.Department of Physical Education,Shaoguan University,Shaoguan 512005,China;2.School of Physical Education,Southwest University,Chongqing 400715,China) Abstract: By utilizing a spring mass model, the authors probed into supporting leg stiffness and leg stiffness during the 800m run competed in by male runners in group B in the 7th Guangdong College Student Games, and revealed the following findings: leg vertical stiffness, leg stiffness and running speed reached their peak values in the 100-200m zone, then started continuous dropping to the end; there was a linear positive correlation between vertical stiffness and running speed as well as between leg stiffness and running speed, and such a correlation also showed between vertical stiffness and the pace and stride as well as between leg stiffness and the pace and stride; there was a significant negative correlation between vertical stiffness and supporting time as well as soaring time, yet there was a significant positive correlation between vertical stiffness and the ratio of soaring time to supporting time, deep reasons for this should be further probed into; the ultimate key for the runners to maintain their running speeds at the late stage of the 800m run is to maintain a higher pace by maintaining a higher vertical stiffness. Key words: sports biomechanics;vertical stiffness;leg stiffness;spring mass model;800m run |