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Showing 4 results for Eslami
Effect of general fatigue on knee join muscle work and power absorption during stance phase of running
Mansour Eslami, Mohsen Nazari,
Volume 16, Issue 15 (9-2018)
Abstract
All sustained physical activities subject the body to various levels of fatigue. This is especially evident when running, which is one of the most popular forms of exercise and may be described as a reduction in maximum force production  and power output . the purpose of this study was to investigate the effect of running in an exerted state on knee muscles power absorption and work during the stance phase of running. Sixteen healthy physical education male students with an average age 22 and SD 2.27 years and height 177 and SD 5.47 cm and mass 72.6 and SD 8.4 kg participated in this study voluntary. Kinetic and kinematic data recorded by using of video camera and force plate. The negative and positive power and work of muscles operating on knee has calculated using inverse dynamic equations in MATLAB2010 Software. Paired sample T test was done to statistical analysis in SPSS 2010 software (p≤0.05). The results of this study indicated that negative peak power and work significantly decreased 33.78% and 22.6% respectively. Although the positive peak power significantly decreased (p≤0.05), positive work didn’t change significantly (p=0.644). The results of this research indicated that the absorbing function of the muscles is decreased following fatigue and may be led to increase the injury risk of running.
 

Designing and simulating of helmet evaluation machine in martial arts based on dynamic’s criterias
N Boroushak, H Khoshnoodi, H Daneshmandy, M Eslami,
Volume 17, Issue 17 (4-2019)
Abstract
Nowadays there is no specific and effective standard for evaluating the helmets in martial arts which it has caused a lot of brain damages. The purpose of this study was designing and modeling a helmet assessment machine in martial arts, based on dynamic’s parameters and criteria. SolidWorks, Adams and Catia softwares were used for designing this machine. Also, In order to build this machine, an artificial head that equipped with force and acceleration sensors and a mechanical arm for applying impact to the head were used. The validation of the machine was done by comparing its results (impact force, linear acceleration and rotational acceleration) with the results obtained from the simulated model in the computer. The Pearson correlation coefficient of 0.9 that obtained from this comparison indicates that the results of this machine are correct. To confirm the reliability of the machine, an Intraclass Correlations was used, the results showed values of 0.7 and greater than that and it also confirmed the appropriate repeatability of the machine. According to the results of this study, due to the considering the important parameters of linear and rotational acceleration and the impact force in evaluating helmets and investigating the mechanism of head injury in the conditions close to competition ones, the device can be an appropriate equipment for more accurate measurement of helmets in martial arts.
Prediction of sprint active women performance using vertical and leg stiffness
Effat Hosseinzadeh, Mansour Eslami,
Volume 18, Issue 20 (11-2020)
Abstract
Introduction: The ability to attain high level of speed is an essential component of success in many sports fields. However, physical qualities that underpin this ability remain unclear. The purpose of this study was to investigate the role of leg stiffness and vertical stiffness in predicting sprint running. Methods: 50 healthy females were selected among physical education students. The required kinetic and kinetic data were collected in three dimensions. The kinetic and kinematic variables rrunning skill was used to measure both stiffness variables. A multivariate regression model was used to examine the possibility of predicting running speed using leg stiffness and vertical stiffness. Findings: The results of multiple regression showed that there is a significant relationship between the two-leg stiffness and vertical stiffness with mean running speed (R = 0.671), and these two variables can predict 42% of Average speed variation (Adj. R square=0.426). Conclusion: The results of the present study showed that the ability of individuals to sprint running is likely to be significantly dependent on leg stiffness and vertical stiffness. The results of this study can provide important information for designing training programs and talent detection for trainers and specialists in this field.

Short Term HMB-FA Supplementation Decreases Muscle Damage Markers After Soccer Matches
Dr Rasul Eslami, Navab Abnama,
Volume 20, Issue 24 (3-2023)
Abstract
The aim of the present study was to investigate The effect of HMB-FA supplementation on the muscle damage markers after soccer matches. 24 male soccer players (age: 23±3 years, BMI: 22.8±2 kg/m2) were voluntarily selected as the statistical sample of this study and were divided into two Suppplement and Placebo groups (n=12). In this study, subjects participated in a weekly soccer microcycle with two matches. Subjects in the supplement-training group consumed three grams of HMB-FA daily during a weekly soccer cycle. Blood samples were taken in seven times (before supplementation, before the first match, immediately after the first match, 24 hours after the first match, before the second match, immediately after the second match, 24 hours after the second match). Plasma concentrations of creatine kinase (CK) and lactate dehydrogenase (LDH) were measured by ELISA kits. Data analysis was performed using Friedman, Wilcoxon, Kruskal-Wallis and U Mann-Whitney tests with a significance level of p ≥ 0.05. After supplementation, a significant decrease in plasma levels of lactate dehydrogenase (before and after the first match) and creatine kinase (in the times immediately after the first match and before the second match) was observed (for all, p <0.05). Intaking HMB-FA supplement reduced the markers of muscle damage, which is essential for recovery from injuries caused by training and competition during a two race cycle. In addition, inaking HMB-FA supplement may have other effects, including reducing neuromuscular fatigue, reducing the inflammatory response, and rapid skeletal muscle regeneration, which requires further study.

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