A new approach to quantify angles and time of changes-of-direction during soccer matches.

ABSTRACT:

Background and aims

Soccer players frequently perform change-of-directions (CODs) at various speeds during matches. However, tracking systems have shown limitations to measure these efforts. Therefore, the aim of the present study was to propose a new approach to measure CODs using a local positioning system (LPS), and clarify position-related difference in profile of CODs by using the approach.

Methods

The x- and y-coordinate data for each soccer player were measured with a local positioning system. Speed, acceleration, jerk, and direction of speed were derived from the coordinate data. Based on accelerations of above 2 m/s2, the onsets and ends of CODs derived from jerk were identified (COD duration). Changes of direction of speed (θCOD) were determined for the correspondi

SUBMITTER: Kai T 

PROVIDER: S-EPMC8128237 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature