THE EFFECTS OF THREE DIFFERENT REAR KNEE ANGLES ON KINEMATICS IN THE SPRINT START

Journal Title: Biology of Sport - Year 2014, Vol 31, Issue 3

Abstract

The purpose of this study was to investigate the rear knee angle range in the set position that allows sprinters to reach greater propulsion on the rear block during the sprint start. Eleven university-track team sprinters performed the sprint start using three rear knee angle conditions: 90°, 115° and 135°. A motion capture system consisting of 8 digital cameras (250 Hz) was used to record kinematic parameters at the starting block phase and the acceleration phase. The following variables were considered: horizontal velocity of the centre of mass (COM), COM height, block time, pushing time on the rear block, percentage of pushing time on the rear block, force impulse, push-off angle and length of the first two strides. The main results show that first, horizontal block velocity is significantly greater at 90° vs 115° and 135° rear knee angle (p<0.05 and p<0.001 respectively) at block clearance and the first two strides; second, during the pushing phase, the percentage of pushing time of the rear leg is significantly greater at 90° vs 135° rear knee angle (p<0.01). No significant difference was found for block time among the conditions. These results indicate that block velocity is the main kinematic parameter affected by rear knee angle during the starting block phase and acceleration phase. Furthermore, the 90° rear knee angle allows for a better push-off of the rear leg than larger angles at the set position. The findings of this study provide some direction and useful practical advice in defining an efficient rear leg biomechanical configuration at the set position.

Authors and Affiliations

Chiara Milanese, Matteo Bertucco, Carlo Zancanaro

Keywords

Related Articles

Age-related changes and gender differences of upper body anaerobic performance in male and female sprint kayakers

The aim of the study was to examine whether young female kayakers performing intense training of the upper extremities could significantly increase upper body anaerobic performance with age and training, diminishing in t...

Assessment of the timing of respiration during rowing and its relationship to spinal kinematics

The purpose of this study was to investigate the use of a nasal thermistor to measure respiration events at the nose and mouth, and to provide pilot data to allow experiments to be developed that relate respiration to th...

THE RELEVANT USE OF A TRADITIONAL TUNISIAN GAME ‘‘RAQASSA’’ FOR CARDIOVASCULAR SOLICITATION IN SCHOOL CHILDREN

Objective: The purpose of this study was to assess whether a lesson of physical activity based on a traditional Tunisian game could be a useful tool for soliciting the cardiovascular system in children. Methods: nineteen...

The Yo-Yo intermittent recovery test level 1 is reliable in young high-level soccer players

The aim of the study was to investigate test reliability of the Yo-Yo intermittent recovery test level 1 (YYIR1) in 36 high-level youth soccer players, aged between 13 and 18 years. Players were divided into three age gr...

Increased extracellular dopamine and 5-hydroxytryptamine levels contribute to enhanced subthalamic nucleus neural activity during exhausting exercise

The purpose of the study was to explore the mechanism underlying the enhanced subthalamic nucleus (STN) neural activity during exhausting exercise from the perspective of monoamine neurotransmitters and changes of their...

Download PDF file
  • EP ID EP59212
  • DOI -
  • Views 115
  • Downloads 0

How To Cite

Chiara Milanese, Matteo Bertucco, Carlo Zancanaro (2014). THE EFFECTS OF THREE DIFFERENT REAR KNEE ANGLES ON KINEMATICS IN THE SPRINT START. Biology of Sport, 31(3), 209-215. https://europub.co.uk/articles/-A-59212