Continuous change in spring-mass characteristics during a 400 m sprint.

摘要: Abstract The purpose of the present study was to utilise a spring-mass model (1) continuously measure vertical stiffness ( K vert ) and leg over an entire 400 m sprint, (2) investigate relationship between spring performance characteristics mean forward running velocity V forwad ), stride frequency f length L ). Eight well-trained male athletes performed sprint with maximal effort on outdoor field track. calculated from subjects’ body mass, ground contact time flight at each step. , were determined video images. peaked 50–100 m interval, consistently decreased middle later part sprint. first 50 m remained constant next interval finish. As compared peak values, in last by about 40% 25%, respectively. A significant positive linear existed . While significantly correlated it had no correlation Further, found or This result indicates that order keep stage maintaining higher through retaining would be necessary.