VMRTVarieties of Minimal Rational Tangents
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Through the presentation of videos of offensive GS, the diagnostic tool we designed enabled us to simultaneously assess VMRT and the accuracy of motor response after different exercise intensity modes administered on a treadmill (Cybex 750T Treadmill) in a research laboratory.
The accuracy of motor response and VMRT was recorded using a SONY HDR PJ220E camcorder.
Therefore effect size by Z-test and nonparametric repeated measure ANOVA (the Friedman test; p < 0.05) with subsequent post-hoc analysis was applied to determine the significance of differences in the VMRT and accuracy of choice of motor response in the four different modes of exercise intensity.
Resulting average values of visual-motor response time among the four modes of exercise intensity: Significant medium size effect (ES = 0.60) was found in VMRT between M-AEM and M-INTERM however without significant confirmation in ANOVA.
Resulting correlation of the visual-motor response time and the accuracy of motor response in the individual exercise modes: No significant correlations were reported between the values of VMRT and the accuracy of motor response among the individual modes of exercise intensity (r = -0.04-0.23; Table 4).
The results of our study confirmed previous findings regarding visual-motor response time because we found significantly faster VMRT after M-AEM (moderate intensity exercise) compared to M-ANAEM (maximal intensity exercise).
The performance of perceptual-cognitive skills involving tasks such as choice reaction time or VMRT typically improves during the completion of exercise tasks of increasing intensities until maximal energy expenditure is reached.
The results of this research showed that anaerobic, high intensity exercise adversely affects VMRT. On the other hand no significant changes were found in the accuracy of motor response during high intensity exercise, intense intermittent exercise, intense aerobic exercise and motor inactivity.
* Further research should focus on the assessment of VMRT from a player's real--field position view rather than a perspective view.
On the SIBT, 4.25% of the participants obtained chance-level scores and on the more difficult VMRT, 17% obtained chance-level scores.