فهرست مطالب کامران شاه دوست

Regardless of the specific benefits of an active lifestyle, a lack of physical activity is a serious issue in various segments of society including youth. The purpose of this study was to determine the level of knowledge, attitude, and physical activity of dormitory students living at Kharazmi University.

In a cross-sectional study, 288 students residing in the dormitory (189 female and 99 male) were selected randomly and filled out the questionnaires on knowledge, attitude, and physical activity. The DASS-21 scale was used to assess students' depression, anxiety and stress states. Data were analyzed by SPSS software at the significant level of 0/05.

The average scores of knowledge, attitude, and level of physical activity of students were moderate, high, and undesirable. In terms of depression, anxiety, and stress, they had good mental health. The results did not show a significant difference between the scores of knowledge, attitude, and mental health of males and females, but the level of physical activity of males was higher. Also, the attitude and physical activity level of students during the week were significantly correlated with the components of mental health and gender, but no significant relationship was found between the other variables.

Overall, because of the prevalence of inactivity in students, identifying how to increase their level of knowledge and physical activity is necessary.

Background& Purpose: One of the factors that potentially influence on the postural tremor and performance of goal-directed tasks is fatigue. The present study was designed to determine the effect of upper limb locality fatigue on performance indicators skilled and novice shooters as a function of the supra-postural goals and movement automaticity mechanisms. performance and postural sway variability rate of two groups of novice shooters (23.33 ±2.40 years) and skilled shooters (24.60±3.38 years) during two trials in 60 seconds before and after isotonic fatigue intensity of 40% - 60% - 70% - 80% MVIC was compare. Shooting performance based on the measurement error in the two-dimensional situations (Radial Error, Subject- Centroid Radial Error and Bivariate Variable Error) was analyzed. recurrence quantification analysis (RQA) for comparison nonlinear dynamics of postural sway participants and the parameter median of data EMG and Borg scale of perceived fatigue as an indicator of fatigue was used. To determine the effect of fatigue on the performance indicators and variability variables, analysis of variance with repeated measures was used. The results showed that with increased fatigue performance of novice shooters significantly changed (p0.05). analysis of Shooting performance in condition exert of locality fatigue represents a significant reduction in the average components variability of postural sway skilled shooters in two direction of anterior-posterior and mediolateral. supra-postural tasks on the focuses attention externally has a powerful effect on the performance and can minimize the effects of individual limitations in skilled shooters

The performance of postural tasks jeopardized consistency by some of the physiological constraints such as noise induced fatigue. The purpose of this study was to investigate the effect of fatigue levels on postural sway variability dynamic structure of people with different levels of physical activity. recurrence
quantification analysis (RQA) was used to compare the nonlinear dynamic structure of postural sway in three groups of students (n = 12), novice shooters (n = 6) and Skilled shooters (n = 6) after isometric fatigue. The frequency domain median parameter of EMG data and Borg scale of perceived fatigue was used as an indicator of fatigue. Analysis of variance with repeated measures was used to determine the effect of fatigue on the variability variables of the three groups. The results showed that fatigue had significant effect on the value of the total variability, while the values of recurrence rate, deterministic structure and trend of 3 groups significantly increased from percent 70 of fatigue. It seems that Consistent performance is created through compensatory variability strategy of motor Parameters and this effect will not be influenced by the level of physical activity. However, the main effect of group is indicative of more adaptability of the skilled athletes in the face of fatigue to maintain optimal performance.