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Mansour Eslami, Mohsen Nazari,
Volume 16, Issue 15 (9-2018)

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.

Leila Nazari, Saba Rahmati,
Volume 19, Issue 22 (12-2021)

One of the most important issues in community is health and progress people. Because of durability of a community depends on health each person. In this regard, the present study aims to compare anthropometric, biomechanical and psychological factors between university student and student girls done. Subjects of the study were 86 girls 15-17 years old and 113 university student 18-24 years old, took part randomly in this study. Measure anthropometric, biomechanical characteristic also psychological characteristics including general health (GHQ-28) and personality (NEO-FFI) were measured. The result of independent t-test showed that between percent fat and lean body mass, static balance and muscular endurance and all of the general health factors, there are significant differences between the two groups. In generally the subjects are in the border abdominal obesity and high risks associated health them. Doing prevention programs are essential. One of the most important proceedings for this group doing of physical activity and fitness and have a regular exercise program.

Dr Seyed Kazem Mousavisadati, Ms Sima Nazari, Dr Keyvan Molanorouzi,
Volume 21, Issue 25 (9-2023)

The purpose of this research was to investigate the effectiveness of snorkeling on teaching basic swimming skills in non-swimmer children and teenagers with fear of water. This research was an experimental type with a pre-test and post-test design with a control group. The participants were 30 children (8.95±0.64 years old) and 30 teenagers (15.06±0.71 years old) non-swimmers who were afraid of water, and the participants of each group were randomly divided into two experimental and control groups (15 people in each group). After participating in the pre-test of skills of entering the water, opening the eyes in the water, gliding, orientation in the water and movement in the water and breath holding, all four groups entered a 20-session course of swimming training, so that the experimental group with snorkel and the control group without snorkel were taught basic swimming skills by an instructor. Then all four groups participated in the post-test. The data were analyzed by two-factor multivariate analysis of covariance (MANCOVA) and Benferoni's post hoc test. The results of the findings show that the main effects of age were not significant, but the main effects of training and the interactive effects of age and training were significant. Using a snorkel in children and teenagers did not have a significant effect on the skill of entering the water, opening the eyes in the water, but it had a significant and positive effect on the skills of gliding, orientation in the water and movement in the water. Also, the use of snorkel in children and teenagers had a significant and negative effect on breath holding skill. Considering that the results of the present study show the positive effects of using a snorkel on learning the skills of gliding and orientation in water and moving in water and its negative effect on breath holding skill in children and teenagers, it is recommended that the instructors who use snorkel to acclimatize children and teenagers to the water, provide additional training to improve the skill of holding their breath.

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