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Showing 3 results for Hejazi
The Effects of Eight-Weeks Aerobic Training on Serum Leptin Levels, Anthropometric Indices and VO2max in Sedentary Obese Men
Pejman Motamedi, Hossin Nikroo, Keyvan Hejazi,
Volume 5, Issue 1 (Journal of Ergonomics 2017)
Abstract

Introduction: Leptin, generated by the obesity gene, acts as an anti-obesity hormone that plays a key role in regulating weight. We aimed to investigate the effects of eight weeks of selected aerobic training on serum leptin levels, anthropometric indices and maximal oxygen consumption (VO2max) in obese men.

Methods: Twenty healthy elderly men were selected by convenience sampling method and were randomly assigned to control (n = 10) and experimental (n = 10) groups. The program training included 45 minutes per session, three times per week for eight weeks of participation in aerobic exercise classes with 55-60% HRR. Pre- and post-aerobic exercise, serum leptin levels, anthropometric indices and VO2max were evaluated. To make intra and intergroup comparisons, t-test for dependent and independent samples were used. For all statistical comparisons, the level of significance was set at P < 0.05.

Results: Eight weeks of aerobic exercise led to a significant increase of Vo2max (P = 0.01). The amount of leptin (P = 0.007), weight (P = 0.002), BMI (P = 0.003), body fat percentage (P = 0.002) and WHR (P = 0.013) in sedentary obese men in the experimental group significantly reduced. The variations of weight, BMI, BFP, WHR and Vo2max in the two groups had differences.

Conclusions: The results of this study showed that the selected aerobic training had a favorable influence on improvement of serum leptin levels and VO2max in obese men.


The Comparison of Fatigue and Trunk and Neck Postures during Working in Tailors with and Without Nonspecific Chronic Neck Pain
Hosein Hejazifar, Rahman Sheikhhoseini, Hashem Piri, Parisa Sayyadi,
Volume 10, Issue 1 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Work-induced musculoskeletal pain disorders are among the most common problems among workers. This study aimed to compare fatigue and trunk and neck postures during work in tailors with and without nonspecific chronic neck pain.
Methods: In this cross-sectional study, 30 sewing machine operators participated voluntarily and were divided in two groups of people with (15 persons) and without (15 persons) chronic nonspecific neck pain. The craniovertebral, cranial, and shoulder angles were calculated three intervals (at the start of work, after 2 hours of continuous work, after 4 hours of continuous work) using the photogrammetric method. Borg scale was used to examine work-induced fatigue. A one-way repeated measure analysis of variance at the significance level of 0.05 was used for data analysis.
Results: There were significant differences in craniovertebral, cranial, and shoulder angle changes (P < 0.001) between the two groups while working. Postural trunk and neck changes were more evident in the nonspecific chronic neck pain group. However, there were no significant differences in terms of fatigue levels between the two groups (P = 0.639).
Conclusion: The upper trunk related posture among workers with nonspecific chronic neck pain may be more negatively affected during work. So it is suggested that maintaining proper posture should be more emphasized among these workers.

Comparison of Indicators of Physical and Health-related Fitness and Body Composition in Different Age Groups of Workers
Keyvan Hejazi,
Volume 11, Issue 1 (Iranian Journal of Ergonomics 2023)
Abstract
Objectives: The study of physical and health-related fitness and body composition indicators in workers is very important to prevent performance degradation. Therefore, this study aims to investigate such indicators among the employees of Izogam Shargh Company.
Methods: In this descriptive-analytical study, 150 workers from 150 stations in Mashhad city were selected by stratified random sampling and divided into three age groupsnamely. 25-34, 35-44 and 45-54 years. Two -way analysis of covariance (ANCOVA) and Bonferroni post-hoc test were performed to compare the variables in the three age groups.
Results: Significant differences were found in body composition indicators, i.e., weight between the age groups 25-34 years with 35- 44 years (P=0.008) and 35-44 years with 45- 54 years (P=0.001), body mass index between the age groups 25-34 years with 45-54 years (P=0.001) and 35-44 years with 45-54 years (P=0.001), body fat percentage between the age groups 25-34 years with 45- 54 years (P = 0.006), maximum oxygen consumption between the age groups 25-34 years with 35-44 years (P=0.001), 25-34 years with 45-54 years (P=0.001), and 35-44 years with 45-54 years (P=0.001). In addition, significant differences were found in all physical and health-related fitness indicators, i.e., agility, explosive strength, flexibility, abdominal muscle endurance, and shoulder girdle muscle endurance, between the age groups 25-34 years with 35-44 years (P=0.001), 25-34 years with 45-54 years (P=0.001), and 35-44 years with 45-54 years (P=0.001).
Conclusion: The results of this study show that the level of  physical fitness of employees decreases with age. Therefore, it is suggested that the managers of companies create the necessary conditions and incentives for employees to engage in regular physical activity.

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