Ebrahim Abbasi; Rasol Yaali; Farhad Ghadiri
Abstract
When an athlete takes maximum advantage of his released degrees of freedom, he is called a motor elite. The aim of this study was to investigate the eliteness by combining speed constraint and explicit, errorless and analogical inference constraints. 21 physical education students (three of them were ...
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When an athlete takes maximum advantage of his released degrees of freedom, he is called a motor elite. The aim of this study was to investigate the eliteness by combining speed constraint and explicit, errorless and analogical inference constraints. 21 physical education students (three of them were excluded from this study: 21-3=18) from Kharazmi University voluntarily participated in this study. The participants in three distinct groups (explicit, errorless and analogical inference) participated in four sessions; each season consisted of 20 blocks and each block 6 attempts so eventually they had 480 repetitions in dart throe skill. One-way ANOVA, Kruskal-Wallis, paired t test and Wilcoxon test were used to investigate the significance of the hypotheses. The results showed that implicit learning emerged as a result of the combination of the speed constraint and the constraints of all three methods (P≤0.05). Adding speed constraint to other training methods (explicit, errorless and analogical inference) makes them implicit and changes the order of the system in errorless method and increases errors. However, for a certain conclusion, subsequent studies are better using muscle activity registration to consider degrees of freedom as a criterion of eliteness. These results can help skill learners, instructors and especially physical education teachers to adopt efficient teaching methods given their time limits.
Saeed Arsham; Farzam Farahman; Fazlolah Bagheradeh; Elahe Arab ameri; Anoushirvan Kazemnejad
Volume 1, Issue 2 , October 2009, , Pages 103-126
Abstract
The aim of the present study was to introduce the methods to extract and to interpret cinematic data in order to explain movement pattern changes via joint coupling and freezing/freeing phenomena in a healthy right-dominant college male (age:26, height: 172 cm, weight: 80 kg) who practiced balance maintenance ...
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The aim of the present study was to introduce the methods to extract and to interpret cinematic data in order to explain movement pattern changes via joint coupling and freezing/freeing phenomena in a healthy right-dominant college male (age:26, height: 172 cm, weight: 80 kg) who practiced balance maintenance on a stabilometer. Data were gathered using a three-dimensional registration system which consisted of three cameras and a computer program (Sharif Motion Analyzer-SMA) in MATLAB software and measured the position of 19 passive markers located on subject's limbs and stabilometer. Before each trial, the system was calibrated by a metal frame of known dimensions to transform the two-dimensional camera detector values to real three-dimensional coordinates. Then, the following variables were calculated for the first, fifth and ninth trail from a 3(session) × 3(trail) course of practice: 1) stabilometer variability as a performance index; 2) absolute and relative variability of joint angles to evaluate possible freezing-freeing process; 3) cross-correlations between the angular time series in order to evaluate the presence of joint coupling. Finally, the interpretation method to extract variables was presented and some limits of such studies regarding the variability in degrees of freedom were provided.
