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Resisted sprint running is a common training method for improving sprint-specific strength. For maximum specificity of training, the athlete's movement patterns during the training exercise should closely resemble those used when performing the sport. The purpose of this study was to compare the kinematics of sprinting at maximum velocity to the kinematics of sprinting when using three of types of resisted sprint training devices (sled, parachute, and weight belt). Eleven men and 7 women participated in the study. Flying sprints greater than 30 m were recorded by video and digitized with the use of biomechanical analysis software. The test conditions were compared using a 2-way analysis of variance with a post-hoc Tukey test of honestly significant differences. We found that the 3 types of resisted sprint training devices are appropriate devices for training the maximum velocity phase in sprinting. These devices exerted a substantial overload on the athlete, as indicated by reductions in stride length and running velocity, but induced only minor changes in the athlete's running technique. When training with resisted sprint training devices, the coach should use a high resistance so that the athlete experiences a large training stimulus, but not so high that the device induces substantial changes in sprinting technique. We recommend using a video overlay system to visually compare the movement patterns of the athlete in unloaded sprinting to sprinting with the training device. In particular, the coach should look for changes in the athlete's forward lean and changes in the angles of the support leg during the ground contact phase of the stride.

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The purpose of this study was to examine the characteristics of goalkeepers' defence interventions in parallel with the type of opponent attack, the area of the last pass of attack, the shooting zone most often used, the body part most often used for the last pass or for shooting, and the technical and physical actions most often used for carrying out defensive technical skills. The sample consisted of 34 goalkeepers from the national teams that participated in 54 matches of the 2002 World Cup in Korea and Japan. The matches were analysed by systematic observation. A reliability kappa index of 0.95 was established between observers. The variables studied were: type of opponent attack, area of last pass of attack, field zone from which shot was taken, body part with which last part of attack or shot was made, zone of goalkeeper intervention, defensive technical and physical actions of goalkeeper intervention. Results related to opposing team's attacks showed that teams most often used positional attacks and the last pass came from the far zones. The foot was the body part most often used to finish the attack. Upon analysing the shots taken, we found that in relation to shooting angle, the central zones are the ones that are most utilized, and in relation to shooting distance, similar percentages were found in the zone outside the penalty area and the zone situated between the penalty area line and the goal area line. Results related to goalkeepers' defence showed that the penalty area was the zone most often used, and the defensive actions most frequently used were the save, followed by foot control, and then the clear out. Our data provide reference values to adapt the training of goalkeepers to the characteristics of the competition.

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