The purpose of this study was to investigate movement speed caused by the two pelvic tilt angle differences (neutral position (n.p) and posterior pelvic tilt (p.t)) at the starting position.

Thirteen highly trained collage soccer players chose. Each player stood on the force plate and sprinted to the goal (2.5m) at anytime on their start. The starting posture was stated in the two pelvic positions (neutral and posterior tilt). Each posture compare of GRF, EMG and COG were compared by each posture.

At the result, In right toe take off , motion time in group of p.t delayed. COG, in “At initial posing” and “start to trunk movement”, posterior tilt COG is more back. (p<0.05). In GRF, in Posterior tilt were less than neutral position both of horizontal and vertical (p<0.05). In EMG, in posterior tilt, BF and RA were less active. In timeline of inclination of trunk, Posterior tilt’s angle is bigger than neutral. After that, trunk moved back and forth than neutral. Pelvic posterior tilt cause to delay motion time for three factor that “Position of COG is more back at initial posing”, “Less of muscle power in hamstring”, “Too much trunk move”.

The purpose of this study was to discuss the availability of submaximal intermittent exercise performance test (Yo-Yo 6min. test). It was investigated longitudinally through the season by focusing on the relationship between Yo-Yo Intermittent Recovery Test Level 1 (Yo-Yo IR1 test) performance and submaximal heart rate of Yo-Yo IR1 test. This study was compared among the start pre-seasonal prep-aration, the end preseasonal preparation and the medium in-season. In the result, Yo-Yo IR1 test performance and submaximal heart rate of Yo-Yo IR1 test had similar variations. Assessing longitudinally heart rate reached after Yo-Yo 6min. test, it is possible to estimate the differences of intermittent exercise performance without forcing the maximum effort to players. Therefore, it indicated that submaximal intermittent exercise performance test was available as condition assessment method of intermittent exercise performance.