Saeed Ilbeigi; Alireza Morshedi; Marziyeh Saghebjoo; Mahdieh Abdullahzade
Abstract
Background and Aim: Today, training on various training surfaces is one of the most important concerns of coaches for improving sports performance, which has rarely been considered in sport teams. The purpose of this study was to investigate the effect of six-week of specific volleyball training on ground ...
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Background and Aim: Today, training on various training surfaces is one of the most important concerns of coaches for improving sports performance, which has rarely been considered in sport teams. The purpose of this study was to investigate the effect of six-week of specific volleyball training on ground surfaces (concrete, floor and sand) on some selected factors of physical fitness in volleyball male players. Materials and Methods: Thirty-six male volleyball players (average age, 16.11±0.82 years) were purposefully selected and randomly divided into three training groups including training on concrete, floor, and sand surfaces. The repeated effort performance test (jump and real-time, time and ideal jump) with four repetitions and rest between repetitions at players’ movement speed between 4 to 8 seconds was used. All tests were performed before and after the training programs. One-way analysis of variance and Tukey’s tests were used at the significance level of p≤0.05. Results: Anaerobic power, explosive power (Jumping record) and time reduction in the repeated performance test significantly increased in the both sand and flooring groups compared to the concrete group. Moreover, agility and dynamic balance in the sand and flooring group had a significant decrease and increase, respectively, as compared to the concrete group. Additionally, dynamic balance showed more increased in the sand group than in the floor group. Conclusion: Specific volleyball exercises on sand compared to other surfaces by increasing training overload caused neuro-muscular adaptations and finally improved sports performance and physical fitness of volleyball players. Accordingly, coaches can use sand surfaces to maximize the benefits of training and prevent injury and pain to players.
Shirin Banitalebi dehkordi; Mohammad Faramarzi; Mostafa Rahimi; Afrasiab Sadeghi
Abstract
Background and Aim: Beach soccer as a new exciting and popular field of sport is spreading rapidly around the world. However, so far, limited accurate and documented information is available about the physical and physiological needs of this sport. The purpose of this study was to investigate the changes ...
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Background and Aim: Beach soccer as a new exciting and popular field of sport is spreading rapidly around the world. However, so far, limited accurate and documented information is available about the physical and physiological needs of this sport. The purpose of this study was to investigate the changes in resting levels of some inflammatory, muscle damage, aerobic and anaerobic indices of beach soccer players in the pre-season, mid-season and end of the premier league season. Materials and Methods: In this quasi-experimental study with repeated measures design, 13 elite beach soccer players (Mean± SD: age 24.64±4.01 year, body mass index 22.76±2.36 kg/m2 and maximum oxygen consumption 38.60±5.48 ml/kg/min) were selected. Measurements of aerobic and anaerobic power and alanin amino teransferase (ALT), aspartat amino teransferse (AST), certain phosphokinase (CPK) and lactate dehydrogenase (LDH) indices were measured in the 98-99 pro league in pre-season, mid-season and also at the end of the season. The repeated measure analysis of variance and Bonferroni tests were used to examine the changes at the significant level of p<0.05. Results: Significant increase in ALT (p=0.04) and also decrease in anaerobic power (p=0.001) was observed from pre-season to the end of the season. LDH levels showed a significant increase in the mid-season compared to the pre-season (p=0.04) and as the same the significant decrease also was found at the end of the season compared to the mid-season (p=0.01). However, no significant changes were observed in AST (p=0.50), CPK (p=0.15) and aerobic power (p=0.11) during the competition season. Conclusion: Due to the physiological pressure for beach soccer players at different stages, it is recommended that players in this field should be monitored for biochemical and functional parameters during the competition season, and based on that, training, nutrition and recovery programs could be optimized.
Ramin Amirsasn; Amir Shakib; Javad Vakili
Abstract
Background and Aim: L-citrulline has recently reported as a more effective supplement for promoting intracellular nitric oxide (NO) production and also performance as compared to L-arginine. The aim of present research was to evaluate the effect of one-week of Citrulline-Malate, L-arginine supplementation ...
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Background and Aim: L-citrulline has recently reported as a more effective supplement for promoting intracellular nitric oxide (NO) production and also performance as compared to L-arginine. The aim of present research was to evaluate the effect of one-week of Citrulline-Malate, L-arginine supplementation and their combination on metabolic stress, blood pressure and exercise performance in male wrestlers. Materials and Methods: In this semi-experimental study, 40 male wrestlers (aged 19-25 years; weight 60-90 kg; body fat percent 12-20) in a randomized and double-blind design were divided into four equal as citrulline-malate (Cit; 4g/days), L-arginine (L-Arg; 4g/days), their combination (2g/days L-Arg + 2g/days Cit) and placebo (P) groups. Before and after supplementation period, all subjects were participated in a competition like wrestling. After the initial blood sampling, the wrestlers performed the wrestling-like competitive test, and then the secondary blood sample was taken five minutes after the test. After one week of supplementation, exercise protocols and blood sampling are performed in the same way. Plasma lactate, urea and both aerobic and anaerobic power were analyzed. Change any of the parameters (mean and standard deviation) during four stages and also between groups were determined by repeated measure analysis of variance and Bonferoni post hoc tests, at the significance level of pResults: Urea and lactate concentration after one week supplementation of Citrulline-Malate and combination of Citrulline-Malate with L-arginine were significantly increased and decreased, respectively (p < 0.05). Moreover, anaerobic power was significantly increased following the combined supplementation (p < 0.05). Also, all three types of intervention could increase aerobic capacity, resting NO levels and NO response to competition like wrestling (p < 0.05). In addition, none of the above interventions had no effect on blood pressure(p>0.05). Conclusion: It seems that combination of Citrulline-Malate and L-arginine supplementation improve performance via reduce exercise-induced metabolic stress and fatigue index (lactate).
Mona Haghshenas; Fahimeh Esfarjani; Jalil Reisi; Sayed Mohamad Marandi
Abstract
Background and Aim: Dehydration due to exercise and heat is a regular issue among athletes that can affect an athlete's performance and even health. This study aimed to identify the effects of different hydration intensity on some of physiological and physical functions in active women. ...
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Background and Aim: Dehydration due to exercise and heat is a regular issue among athletes that can affect an athlete's performance and even health. This study aimed to identify the effects of different hydration intensity on some of physiological and physical functions in active women. Materials and Methods: Ten healthy active women with an average age: 26.6 ± 6.24 years, Height: 163.20 ± 5.20 cm, weight 54.89 ± 6.59 kg and BMI 20. 59 ± 2.45 kg/m2 voluntarily participated in three separate days at different intensity euhydration , mild and moderate dehydration. Dehydration situation provided by exercise, heat stress and water consumption. Anaerobic power, upper and lower body muscular strength and endurance were measured in three conditions. To analyse the data the repeated measure variance were used and the significance level was considered at pResults: At mild and moderate dehydration situations significant reduction were observed as compare to euhydration situation including; in anaerobic power 7.37 per cent and 11.94 per cent, upper body muscular Endurance 3.4 per cent and 17.44 per cent, lower body muscular endurance 2.66 per cent and 5.75 per cent, lower body muscular strength 4 per cent and 11 per cent respectively. Upper body muscular strength in moderate dehydration as compared to euhydration situation also 8.62 per cent decreased. Conclusions: It seems that some physical factors such as anaerobic power, muscular strength and endurance, also in mild intensities may be significantly reduced by dehydration.
Jehangir Ahmadi; Ali Hassani; Adel Donyai
Abstract
Background and Aim: The purpose of this study was to identify the effects of ginseng supplementation and six weeksof resistance training on aerobic and anaerobic factors of non-active students at the university of Shahrood. Materialsand Methods: In this way, 50 students of Shahrood university with an ...
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Background and Aim: The purpose of this study was to identify the effects of ginseng supplementation and six weeksof resistance training on aerobic and anaerobic factors of non-active students at the university of Shahrood. Materialsand Methods: In this way, 50 students of Shahrood university with an age average of 19±2 years and the body mass index average of 22±3 kg/m2 voluntarily participated in the study. The subjects were divided randomly into four groups including training+supplement (13 people), training+placebo (13 people), supplement (12 people), and control (12 people) groups. Training groups were performed a designed protocol three times per week for 6 weeks. Before and after the training program, the Bruce aerobic test, the Wingate anaerobic test and body composition were measured. The Kolmogorov-Smirnov test was used for evaluating of normal distribution of data and then the paired t-test and repeated measure ANOVA test (4×2) were applied for detection of significant differences (p<0.05) between groups. Results: The peak anaerobic power (p=0.02) and maximum aerobic power (p=0.001) were significantly increased in the training groups, however, average aerobic power (p=0.12), minimum aerobic power (p=0.09) and fatigue index (p=0.32) did not show any significant differences between groups. Conclusion: Compared to the resistance training intervention, resistance training along with ginseng supplement may have a greater role in improving aerobic and anaerobic power in non-active male students.
Ali Asghar Mazani; Ali Asghar Mohammadi; Mohammad Shabani; Ali Hasani
Abstract
Background and Aim: The aim of the current study was to compare the aerobic and anaerobic power, body mass index and fat distribution percent in athletic and non-athletics students in Islamic Azad University-Kashmar branch. Materials and Methods: 30 elite athlete students (20-25 years) involving in different ...
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Background and Aim: The aim of the current study was to compare the aerobic and anaerobic power, body mass index and fat distribution percent in athletic and non-athletics students in Islamic Azad University-Kashmar branch. Materials and Methods: 30 elite athlete students (20-25 years) involving in different sports and 30 non -athlete students as control group were randomly selected. The aerobic power was measured using an ergometer, Sargent jumping test also was used to measure anaerobic power. Caliper was also used to measure percent distribution of body fat from chest, abdomen and hip regions. The body mass index (BMI) calculated by dividing weight (kg) by the square of height (meter). Independent t- test used to analyze data with a significant level at p≤ 0.05 with SPSS software. Results: The result of current study showed that there is no significant difference between BMI and aerobic power in athlete students and non - athlete students. However, anaerobic power of athlete students was significantly higher (p=0.03) than non-athlete students. Conversely, percent body fat in non - athlete students was significantly greater (p=0.001) than the athlete students. Conclusion: sports exercise in student career and university campus increases the anaerobic power and also decreases subcutaneous fat in athlete than non-athlete students.
