Einsatz von Shutter-Brillen im Tennis – Einfluss von (Bild-)Frequenz und Dunkelphasenanteil auf die Zielschlagpräzision

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