Dr Mahdi Nabavinik, Dr Hamidreza Taheri, Dr Alireza Saberi Kakhki, Dr Hamidreza Saberi Kakhki,
Volume 13, Issue 25 (9-2023)
Abstract
Massive amount of practice over many years raise the question that handling class of action by generalized motor program may modify over years. The purpose of the present study is to provide evidences to investigate this hypothesis by examining the pattern of co-activation and agonist to antagonist activity ratio. Seven experienced darts players were asked to execute from standard dart distance (fourth distance) and six other farther and nearer distances, making 252 throws. Relatively, the results showed that at least in five from the seven samples, there was a significant difference in muscle co-activation between fourth and six other distances. These findings do not support the existence of a generalized motor program at fourth distance so that performance of elite players met limited generalizability
Dr Davoud Fazeli Kasrineh, Dr Hamidreza Taheri, Dr Alireza Saberi Kakhki,
Volume 100, Issue 100 (10-2020)
Abstract
The purpose of this study was to investigate the effect of practice variability in physical compared with observational practice on golf putting performance. To this end, 50 male right-handed students (25±3.7 years) of the Ferdowsi University of Mashhad participated in this study. Participants were randomly divided into 5 groups (physical constant, physical variable, observational constant, observational variable, and control). During acquisition, the physical variable group randomly performed 50 trials from 5 different starting points to 2 different targets, but the physical constant group performed 50 trials from one starting point to one predetermined target. The observational variable and constant groups observed the performance of the physical variable and constant groups, respectively. The control group just participated in pre-and post-tests and did not practice any trial. Participants performed a test just like the pre-test 10 minutes and also 24 hours after practice. Putting accuracy was measured as the dependent measure. Results showed that variability of practice had a positive effect on participants’ performance than constant practice in physical and observational conditions (all P<0.05). Maybe the similar underlying mechanisms and also the similar feedback effects resulted in the higher performance of the variable group than the constant group in physical performance and action observation.
Dr Hiwa Bahramfard, Dr Ghodratallah Bagheri, Dr Asadullah Kordnaeij, Ali Saberi,
Volume 100, Issue 100 (10-2020)
Abstract
Considering the rapid process of technological changes, if a business cannot adapt itself to the changes in the environment, it will no doubt stop competing. Therefore, the entrepreneur should make a decision in the shortest possible time to take advantage of the opportunity. It has become more difficult, so this research was done with the aim of deciding to take advantage of the opportunity by emphasizing the role of the entrepreneur in sports businesses. This research is in terms of mixed method, in terms of developmental-applicative goal. In the first step, 36 indicators were identified from 32 articles, and in the second step, 36 indicators were extracted by the theme analysis method, and 27 indicators were confirmed by the Delphi method, and in the third step, 34 themes were identified from the lived experience of 6 people. Sports entrepreneur leaders were identified by research narrative method, and finally, after combining and integrating the three stages, 44 identification indicators were found in a 7-dimensional template, whose suitability and validity were confirmed using the t-test and the four criteria of adaptability, comprehensibility, generalizability, and control. became. Based on the findings, the entrepreneurial personality by creating seven roles of self-efficacy, independence, risk-taking, individual characteristics, creativity, effort and perseverance, entrepreneurial network and entrepreneurial skills and experience in improving decision-making in order to take advantage of entrepreneurial opportunities in sports and reduce environmental risk. There is a punishment.
