درخت حوزه‌های تخصصی

Purpose: Low back pain is one of the most common health problems of the world. Very different causes can cause back pain. Approximately 85% of people who are examined for low back pain the cause is not specific. The purpose of this study is to investigate the effects of the knee abnormalities on pain intensity and functional fitness in middle aged men with the chronic nonspecific low back pain. Method: The statistical community of this study includes 30 people of patient’s male with nonspecific chronic low back pain in the age range of 30-50 years with one of the abnormalities of genu varum or genu valgum. Results: The research findings were analyzed using descriptive and inferential statistical methods (dependent t and independent t tests). The research findings indicate that both the pain and disability of the experimental groups have significantly decreased after applying selected of corrective programs (Stretching muscles and short elements and strengthening weakened muscles). Sitting frog, walking with the inner edges of the legs, pressure to enter the wall with the outer edges of the legs to modify the genu varum. passing legs from one side to another in the form of scissors in liner mode, passing the medicine ball to the wall with the inside of the legs, walking with the outer edges of the legs to modify the genu valgum (p<0.05). While the two variables in the control group did not differ significantly (p>0.05). Conclusions: According to the results and considering the conditions prevailing on the research samples, it can be concluded that knee abnormalities (genu varum and genu valgum) affected by pain intensity and functional fitness efficacy in nonspecific chronic low back pain patients and Corrective exercises of these abnormalities has had a significant effect on reduce pain and disability index.

Background: Low back pain is a common debilitating condition and a major clinical and socio-economic problem in the most industrialized and non-industrialized countries. Aim : The aim of this study was to compare the effect of motor control exercises and PNF exercises on postural control, strength, endurance and proprioception in women with chronic non-specific low back pain. Materials and Methods: Forty-five women with non-specific chronic low back pain selected by convenience sampling and randomly divided into three groups of 15 (motor control exercises, PNF exercises, and control group). The pre-test included posture control, flexor and extensor muscle strength of the trunk, trunk muscle endurance, and proprioception using Y balance, dynamometer, McGill, and Goniometer tests, respectively. The subjects of the experimental groups performed the training program for 8 weeks under the supervision of the instructor and according to the training protocol. Then, the post-test was performed. Paired t-test and analysis of covariance at the significance level of 0.05 were used to collect data. Results: The results showed that motor control and PNF exercises improved proprioception, postural control, endurance, and strength of trunk flexor and extensor muscles in women with non-specific chronic low back pain (α≤0.05). The results also showed that there was no significant difference between the effects of motor control and PNF exercises on proprioception, postural control, flexor muscle endurance, and extensor muscle strength (α≥0.05). Discussion: Motor control and PNF exercises are effective in improving the proprioception, postural control, endurance, and strength of flexor and extensor muscles of the trunk with non-specific chronic low back pain, and both training methods are effective in treating chronic non-specific low back pain.

Background: Autism spectrum disorder is a neuro-developmental disorder with a significant deficiency in communication characteristics, social interactions and stereotyped behaviors. Aim: The purpose of this study was to investigate physical activity participation in Iranian children and adolescent with autism spectrum disorders. Materials and Methods: The research method was descriptive and survey. The statistical samples were 370 children and adolescent with ASD, age 8-20 years from Iran. The international physical activity questionnaire for older children and adolescents used for measuring physical activity levels. Data analyzed by using SPSS<sub>23 . Results: The results showed that 73.8% of participants were inactive during the last 7 days; 17.8% of them were active occasionally (1 to 2 times); 6.5% (3 to 4 times) and 1.1% (5 to 6 times) were physically active. During the last 7 days on weekends, 58.2% reported usually sitting position, 22.2% walking or standing, and 14.6% running or active playing and only 1.1% reported lots of running or playing. There was no significant difference in physical activity levels between girls and boys. Conclusion: The results showed the limited participation in physical activity among Iranian children and adolescents with ASD. This study seems to be a helpful for identifying the patterns and promotion of physical activity.

Background : Excessive repetitions of the landing and jumping task are a key risk factor for lower extremity injury (specially ACL) in female volleyball players. Aim: this study investigates the effect of Sports-Metrics Volleyball Training (SMVT) on landing technique in female volleyball players. Materials and Methods : The participants of this study were 25 female young volleyball players and randomly divided into training (TG, n=13) and control groups (CG, n=12). The TG performed SMVT for 18 sessions, and the CG performed their regular training. Landing error scoring system (LESS) test were used for assessing landing errors. SPSS (version 25) was used to analyze the statistical data ( P <0.05). Results : The results of the data analysis showed a significant improvement ( P =0.01) in LESS in TG (from 8.62 to 5.54), but no significant changes in CG the LESS ( P =0.62, from 8.00 to 8.23). Eighteen sessions SMVT reduced the landing error by 35.73% in the TG. Conclusion : Base on previous research the SMVT reduces lower extremity injuries and the results of this study showed that SMVT significant improvement the landing technique. Therefore, performing SMVT is recommended for female volleyball players because it is effective in both preventing injuries and improving landing technique.

This study was conducted to identify and to rank the factors affecting market retention in fitness centers.14 participants including the customers and managers of fitness centers participated in a semi-structured interview to collect the required data. Sixteen factors were extracted from the interviews and sixteen experts evaluate the relationships among these factors with pairwise comparisons.Based on Interpretive-Structural Modeling, the factors categorized in five levels, i.e. 1) customer relationship quality,customer experience quality, reputation, price, perceived value and satisfaction, 2) Overall servicequality, secondary services and ethical climate, 3) Training type and schedule, location and accessibility and social responsibility, 4) Interior design and equipment, 5) Manager communication and trainer’s competencies.   For the sake of customer retention, fitness centers are required to align their decisions with their customer requirements. Ranking the effective factors in this study can provide the fitness centers’ managers with a better understanding of the factors affecting customers’ decisions.

The present study aimed to propose a revenue model for hosting the sports events in Iran. 220 university professors, sports experts, staffs of sports federations, and management agents of international sporting events participated in this study. A researcher-developed questionnaire was used for data collection. Factor analysis was conducted to verify the structure validity. SPSS 22 and PLS software were applied for data analysis. Based on the findings, 12 factors were found to be significant in the monetizing from hosting the sporting events. Sponsors, human resources, politics, governmental institutions, law, sport fields, scientific, security, government support, media, Facility development, and fans were the most important factors for revenue generation in hosting sports events. Managers, organizations, and the organizers of sporting events can use appropriate strategies in the fields of media, sponsors, security of the country, investment, fans, governmental institutions, development of sporting facilities and places, and policy by utilizing the results and model provided in the present study in order to generate money from sporting events.

Although the succession planning literature focuses more on managerial and staffing levels in organizations, it can also be used for players in clubs and sport teams. The purpose of the research was to identify and evaluate a model of player succession in Iranian football premier League. The research method was mixed (qualitative and quantitative). The statistical population of this research in the qualitative section includes 16 specialists and experts in football, and in the quantitative part of the research, all managers, athletes, coaches and football referees in the Premier League in 2020, and finally 286 subjects were studied through stratified random sampling in quantitative phase. Research hypotheses were examined using correlations and structural equations modelling . A total of 189 primary codes (concepts) were extracted in the coding process, which after validation, 33 primary codes (concepts) were compiled. In the model, causal conditions included binding or motivating factors as well as the process of replacing players. Underlying conditions involved networking to develop a player replacement program, interacting with other organizations, formulating binding strategies, and setting a budget to promote win-win thinking in the football club succession program in Iran.

This study aims to evaluate the seven-a-side football program of the national Paralympic committee (NPC) of Indonesia at the Association of Southeast Asian Nations (ASEAN) Para Games 2015 in Singapore. The study used a qualitative method to fulfill the research objectives, using the Context Input Process Product (CIPP) model, a data of questionnaires, as well as observation method. The result showed that evaluation of context including a legal basis and strong government policy, the vision, mission, and goals has been fulfilled. The evaluation of input that denotes recruitment process of good athletes and coaches are going well. Evaluation of process that includes the training plan has been implemented well, but the implementation of training, assessment exercises, evaluation and monitoring need to be optimized. The evaluation of product involves athletes’ performance in Difabel event that has not been implemented optimally with three defeats and one draw, so they were runners-up in the ASEAN Para Games 2015 in Singapore. According to the findings, the planning of the development program for seven-a-side football athletes at the ASEAN Para Games 2015 in Singapore is solidly legal. Therefore, this program needs a comprehensive evaluation to achieve better results in future.