Majid Akbari Yazdi; Mehdi Sohrabi; Amir Moghadam
Volume 2, Issue 3 , October 2010
Abstract
Attention is one of the effective factors when learning and performing motor skills. Focus of attention is a method to increase the efficiency and learning. Previous studies have shown that focus of attention plays an important role in learning and performing motor skills. The purpose of the present ...
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Attention is one of the effective factors when learning and performing motor skills. Focus of attention is a method to increase the efficiency and learning. Previous studies have shown that focus of attention plays an important role in learning and performing motor skills. The purpose of the present study was to compare the effect of the instruction of far and near external focus of attention on dynamic balance task performance. In this study, sixty male undergraduate students of Ferdowsi University of Mashhad, who had taken the general physical education course in the second semester of 1388-89, were assigned randomly in three groups: far external attention group (attention to those signs far from the feet), near external attention group (attention to those signs near the feet) and control group (no attentional instruction). The stabilometer (Biodex) was used to collect the data. Each participant performed three 20-second trials in dynamic balance test. The obtained data were analyzed by descriptive statistics as well as inferential statistics such as one-way ANOVA and Duncan post hoc test. The results showed that far external attention group performed significantly better than control group while near external attention group did not reveal any significant difference compared to the control group.
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.
