1. The features interaction of foot and ground mostly determine efficiency of high speed run (Bates, 1983; Lee & Piazza, 2009). But now there aren't justified recommendations about optimal of foot abduction in first foot strike in sprinting. So the aim of this study was comparison of kinematic characteristics of athlete's center of mass (CM) in sprinting with forward and outward toes position. Introduction Methods Four male sprinters were tested for this study (age 19.3±2.0 years, body mass 71.5±8.5 kg, height 182.8±7.2 cm, 100 metres best 11,23±0,25 s). Every participants had two attempts in 50 metres maximal speed running: first attempts with comfortable foot position in first foot strike and second attempts with toes forward. 3-D video analysis (Qualisys, six cameras ProReflex with the frame rate 120 Hz) was used for evaluating kinematic characteristics of athlete's CM. The data were filtered with the 2nd order of lowpass filter (10Hz). Were analyzed kinematic characteristics of athlete's CM from takeoff moment of one leg to takeoff moment of other leg. Videotaping performed on 38-42 metres of distance. One-way analysis of variance was used to examine statistical differences of data. Kinematics of athlete’s center of mass in sprinting at various foot abduction in first foot strike Oleg Nemtsev & Mikhail Shubin Adyghe State University (Maykop, Russia) & Kuban State University of Physical Education, Sport and Tourism (Krasnodar, Russia) Results Value of foot angle (Figure 1) in first attempt was significantly large than in second attempt (Table 1, p 0.05) of following characteristics between run with both first foot strike techniques were found: average velocity of CM, ground contact time, flight time, horizontal displacement of CM in direction of moving during ground contact time and during flight time, vertical displacement of CM during ground contact time and during flight time. References Bates, BT (1983). Foot function in running: researcher to coach. Proceedings of I International Symposium on Biomechanics in Sports. San Diego, USA, 293-303. Lee, SS & Piazza, SJ (2009). Built for speed: musculoskeletal structure and sprinting ability. J Exp Biol, 212(22), 3700-3707. Table 1 Mean (  S.D.) of running technique's characteristics at various foot abduction in first foot strike Data Comfortable foot position Toes forwardp Foot angle (°)19.9±5.910.9±4.4p<0.05 Ground contact time (s)0.098±0.0080.100±0.007p>0.05 Flight time (s)0.146±0.0140.152±0.015p>0.05 Athlete’s center of mass variables Velocity (m/s)9.30±0.359.12±0.20p>0.05 Horizontal displacement during ground contact time (m)0.83±0.090.84±0.08p>0.05 Horizontal displacement during flight time (m)1.27±0.111.29±0.11p>0.05 Vertical displacement during ground contact time (m)0.02±0.00 p>0.05 Vertical displacement during flight time (m)0.04±0.010.04±0.02p>0.05 Discussion Results of present study haven't shown what foot position toes forward or outward in the first foot strike in maximal speed run is better. Horizontal velocity of CM not increased significantly after decrease of foot angle. At the same time not all participants of this study really completed their task to turn toes forward. It is shown that foot position in first foot strike is strong skill and planting foot with zero angle (neutral position) can be reason of larger changes of kinematic characteristics of CM than in present study. Figure 1: The method for determining the foot angle (bottom view). Foot angle contact: oleg.nemtsev@mail.ru