Showing 6 results for Accuracy
Dr Behrouz Abdoli, Dr Alireza Farsi, Mr Javad Riahi Farsani,
Volume 5, Issue 10 (12-2015)
Abstract
Self-talk as “an internal dialogue, through which the individual interprets feelings and perceptions, regulates and changes evaluations and convictions, and gives him/her instructions and reinforcement”. The purpose of the present study was to compare the effect of two types of instructional and motivational self-talk on the pattern of coordination and accuracy of basketball free throw to specify the effect of each types of the self-talks on of basketball free throw skill necessities (patterns of coordination and accuracy). Using available sampling method, 20 male basketball players with the mean age of 23.5±5.5 were selected who had at least 5 years of practice in basketball and were playing in one of the credible leagues of the country. In this study the basketball free throw skill was evaluated through two sessions with the time interval of 24 hours in two phases with and without self-talk (instructional and motivational). The data of the motion pattern and the accuracy of basketball free
throw were recorded in both phases of the test, and the kinematic data was used to compute the throw hand elbow-wrist No-RMS in order to investigate the coordination pattern. In statistical analysis, the data was analyzed using descriptive statistics
(mean, standard deviation, tables and figures) and inferential statistics (the analysis of variance with repeated measure and dependent t test). The results of throw accuracy showed that solely the use of instructional self-talk leaded to a significant
enhancement of the basketball free throw accuracy (t(9): 4.388, p: 0/002). Moreover, there was a significant difference between the effect of instructional self-talk and motivational self-talk in favor of instructional self-talk (2: 0.444, F(1,18): 14.364, p:0.001). Exploring the results of coordination pattern revealed that instructional selftalk leads to a significant (t(9): .048, p(1,18): 2.288) decline in elbow-wrist No-RMS and consequently an improvement in elbow-wrist interalimb coordination in performing the basketball free throws. The results indicated that the usage of instructional selftalk are benefical in improving the skills that require motiom coordination and accuracy of performance and it is superior to the use af motivational self-talk in this regard.
Dr Behrooz Abdoli, Dr Nasoor Ahmadi, Mrs Azam Ghazi,
Volume 6, Issue 12 (11-2016)
Abstract
According to Specificity of practice hypothesis, availability of visual information
specially during performing tasks witch vision has an important role in improving
the accuracy, causes further performance decrements in No-vision transfer test.
The purpose of the current study was to examine the effects of vision and amount
of practice on accuracy and kinematic of dart throwing. 20 female students of righthanded
who were all novitiate in the skill selected voluntarily and randomly
assigned to full vision and No-vision groups.The subjects following participated in
pretest, performed acquisition phase that consisted two level of modest and
extensive practice (45 trials and 300 trials). 10 minutes after each level of practice,
participants completed transfer trials in a no-vision and no-KR condition. Overall,
Mixed ANOVA (2×3) in acquisition phase revealed that vision improved Dart
throwing accuracy performance. Kinematic analysis revealed no significant
difference between two groups in Wrist flexion, Angular displacement of elbow and
Angular displacement of shoulder. Whereas after 300 trials of practice, there was
significant difference between groups in throwing time and angular velocity of the
dart. After extensive practice, Mixed ANOVA (2×2) showed that, withdrawal of
vision resulted in specificity of practice effects on dart throwing accuracy, but
results of kinematic pattern, regardless of the amount of practice did not support
specificity of practice.
Mr Aria Fathi Niazi, Dr Mansur Eslami, Dr Somaieh Namdar, Mr Mortaza Homayoun Nia,
Volume 8, Issue 15 (8-2018)
Abstract
The purpose of this study was to examine the effect of mental training compared with physical training on on foot joints and accuracy of instep penalty kick in soccer. Method research was a quasi-experimental. 33 male students of Mazandaran University organized in three groups (physical training group, mental training group and control group). After pre-test, mental and physical training groups did their practices and then participated in post-test. Kinematic data were recorded with a camera (JVC, 200HZ), and each penalty score was considered as an indicator of accuracy. Lower extremity joints (hip, knee and ankle) angle in sagittal plane and ball to foot velocity index were calculated with MATLAB2010 software. To find differences, ANOVA and tukey test was done with SPSS18 (α=0.05). Range of motion of hip and ankle joints had positive significant effect with accuracy (r=0.415 and r=0.562 respectively), but there was no significant effect between knee range of motion and accuracy. Regard to this research, we could propose to soccer trainers both practice manners depend on their conditions.
Dr Hamid Zahedi, Mis Forogh Tabatabaei,
Volume 11, Issue 21 (7-2021)
Abstract
Purpose: of this research was to compare the effects of internal/external and related/unrelated on Quiet eye changes and accuracy free throw of skilled male basketball players. Methodology: The statistical population of this research was all-male skilled basketball players of Esfahan city in 2017. Using purposeful sampling, 20 skilled basketball players (24/55±2/25 years) who were eligible to enter the research (using the Basketball Premier League players according to the test of the level of mastery of free throwing basketball) were selected. In order to measure the accuracy of basketball throwing, an eight-value scale was used. To measure the Quiet eye changes Eye-tracking was used. In order to analyze data using SPSS software using paired t-test and analysis of variance with repeated measures were used. Results: showed the impact of each of the strategies on the accuracy of free throws and Quiet eye changes in skilled basketball players. Also, unrelated external focus strategy compared with other strategies, further enhancing the accuracy of the basketball free throw and further increased the length of the Quiet eye of skilled basketball players Conclusion: It is recommended that coaches use an irrelevant external strategy to improve the performance and behavior of skilled athletes.
Dr Shahram Nazari, Mr Mohammad Reza Soleymanzadeh, Mr Peyman Honarmand,
Volume 11, Issue 22 (12-2021)
Abstract
The purpose of the current study was to determine the effect of sport vision training on vision perception and decision making of handball referees. In this semi-experimental study, 30 handball referees were Participated among all the referees working in the Iranian Handball Premier League, then the selected referees divided into 2 sport vision training and control groups, randomly. The study included pre-test and post-test phases. Subsequently, participants completed Frastig vision perception test and made decisions after watching 30 prepared clips in pre-test phase. Afterwards, participants completed performing 8 weeks of determined sport vision training, each week included 3 sessions and each session lasted 45 minutes. Henceforth, the participants re-performed Frastig vision perception test and repeated decision making process after watching 30 determined clips. Finally, the collected data were analyzed by paired sample t-test and covariate statistical methods. The results indicated that sport vision training and decision making training significantly affected vision perception and decision making of handball referees. Therefore, the results suggest the utilization of vision perception and decision making training as an effective method in order to improve decision making and vision perception.
Dr Mozhgan Memarmoghaddam, Dr Masoumeh Ali Asghari Toyeh, Mrs Mitra Mohammadi,
Volume 12, Issue 23 (9-2022)
Abstract
The purpose of this study was to determine the effect of focusing attention on quiet eye behavior and accuracy of execution on dart throwing skills. For this purpose, 20 male students in dart beginner (age range 19-22 years old) were voluntarily selected. All participants performed external and internal attention instructions in a counterbalanced manner. Thus, Participants first made 10 attempts at baseline (without attentive instructions). Then performed a total of 20 training attempts as counterbalance in both external and internal attention strategies. In all trials, visual system information was recorded using an eye tracking device and the radial error formula was used to measure accuracy. Data were analyzed by repeated measure ANOVA (P=0.05). The results showed that the accuracy of throwing was significantly improved in external attention condition compared to baseline and internal conditions (P=0.001). The results also indicate that the quiet eye period was longer in the external focus condition than in the inner attention condition (P=0.001). According to the results of this study, it can be assumed that quiet eye duration is one of the essential mechanisms in execution accuracy of targeting skill in beginners, and that focusing attention in addition to execution accuracy is also effective on quiet eye duration.
