Assessment of the visual behavior of volleyball players while blocking the ball: A study using a wearable camera
The present study was conducted to analyze the visual behavior of volleyball players using a wearable camera, instead of the expensive eye trackers that have been employed to date. The position of the players forehead, i.e. the direction of the line of sight, was estimated approximately from the images recorded by the camera (pilot studies 1 and 2). We then examined differences in the players gaze shift patterns, ball pursuit time and initial spiker fixation when blocking the volleyball, as a function of experience in playing volleyball (main study). The results from pilot studies 1 and 2 indicated that the ball pursuit time from just after release of the ball by the setter and the time taken to fix on the spiker, i.e. the time between the blockers eyes leaving the ball and shifting to the spiker, was measured as accurately by the wearable camera as by using an eye tracker. The main study indicated that gaze shift pattern was separable into gaze shift (volleyball players, 100% and general sports players, 47.8 %) and ball pursuit types (general sports players, 52.2%) indicative of skills based differences. However, there was no detectable difference in the time when players shifted their sight from the ball, or in the time when they saw the spiker, according to skills based on prior volleyball experience. In conclusion, the present findings indicate that it is possible to estimate visual behavior during blocking tasks in volleyball using a less expensive wearable camera, rather than an expensive eye tracker.
© Copyright 2017 International Journal of Sport & Health Science. Japan Society of Physical Education, Health and Sport Sciences. All rights reserved.
|Subjects:||volleyball competition clearance movement eye perception video auxiliary device movement precision|
|Published in:||International Journal of Sport & Health Science|