Abstract
Purpose. The use of shutter glasses for perception training in sports requires knowledge of adequate load dosage. The study analyses the influence of (image-)frequency or “duty ratio” (dark phase percentage) on target stroke accuracy in tennis. Material and Methods. With a total number of 22 tennis players (18m, 4f, mean age = 23.6, SD = ± 2.7 years) the target hit precision was conducted. The tennis players had to return the balls played to them by a ball machine using the forehand volley and to make direct hits to a bull’s eye (high scores = high target hit precision). The results with different (randomised) conditions (strobe rates level II = 5.3 Hz, level V = 2.3 Hz, lev- el VIII = 1.0 Hz; dark phase level II = 88 ms, level V = 341 ms, level VIII = 909 ms) of currently used shutter glasses (Nike Vapor Strobe) and without occlusion have been compared. Keywords intermittent vision, stroboscopic visual training, shutter lens glasses, sports vision training, tennis
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