TYPE-SPECIFIC STEP CHARACTERISTICS OF SPRINTERS DURING ACCELERATION PHASE OF 100-M RACE

  • Hikari Naito
  • Yasushi Kariyama
  • Kenji Miyashiro
  • Kohei Yamamoto
  • Satoru Tanigawa
Keywords: athletics, type classification, step frequency, step length

Abstract

The purpose of this study was to show the type-specific step characteristics during acceleration phase (0‒30 m) of a 100-m race. Fifty-nine male varsity sprinters (10.68 ± 0.22 s) were recorded running in 100-m races using 10 high-speed cameras, and step variables in 0‒30 m and maximum speed phase (MSP, 30‒60 m) were calculated. Cluster analysis was used to classify the subjects into the step-frequency (SF) or -length (SL) reliant group (i.e., type-specific) as indicators for the ratio of the SF and SL in the MSP. Then, each group was divided into two sub-groups according to the mean speed in MSP (good and poor sprinters). As a result, the sprinters were classified into SL-, SF-, and Mid-groups. In SL-group, good sprinters showed a longer SL from the 7th step to MSP than the poor sprinters. In SF-group, good sprinters showed a higher SF from the 7th step to MSP than the poor sprinters.
Published
2013-09-03
Section
Coaching and Sports Activities