the effect of upper limp localized fatigue on performance of expert and novice archery shooters:task vs:individual constraints

Background&Purpose: One of the factors that potentially influence on the postural tremor and  performance of goal-directed tasks is fatigue. The present study was designed to determine the effect of upper limb locality fatigue on performance indicators skilled and novice shooters as a function of the supra-postural goals and movement automaticity mechanisms. Methodology: performance and postural sway variability rate of two groups of novice shooters (23.33 ±2.40 years) and skilled shooters (24.60±3.38 years) during two trials in 60 seconds before and after isotonic fatigue intensity of 40% - 60% - 70% - 80% MVIC was compare. Shooting performance based on the measurement error in the two-dimensional situations (Radial Error, Subject- Centroid Radial Error and Bivariate Variable Error) was analyzed. recurrence quantification analysis (RQA) for comparison nonlinear dynamics of postural sway participants and the parameter median of data EMG and Borg scale of perceived fatigue as an indicator of fatigue was used. To determine the effect of fatigue on the performance indicators and variability variables, analysis of variance with repeated measures was used. Results: The results showed that with increased fatigue performance of novice shooters significantly changed (p0.05). analysis of Shooting performance in condition exert of locality fatigue represents a significant reduction in the average components variability of postural sway skilled shooters in two direction of anterior-posterior and mediolateral. Conclusion: supra-postural tasks on the focuses attention externally has a powerful effect on the performance and can minimize the effects of individual limitations in skilled shooters