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Showing 2 results for farjad pezeshk
Comparison of Common Mechanisms in the Design of Hip Belts in Backpacks on the Coordination between Trunk and Hip Segments during Walking
Faridah Aghahasni Mahabadi, Abbas Farjad Pezeshk, Mohammad Yousefi,
Volume 12, Issue 2 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: Using a backpack with a hip belt limits hip movements and prevents disruption in hip and trunk coordination. Therefore, this study aimed to compare the effect of common mechanisms in the design of hip belts in mountaineering backpacks on the coordination between trunk and pelvis organs during walking.
Methods: This semi-experimental research was conducted on 16 men. Three types of backpacks with different hip belts were used. Participants carried backpacks with a load of 13 kg. The continuous relative phase and its variability were used to analyze the coordination. Descriptive statistics of mean and standard deviation and analysis of variance with repeated measures were used to compare variables in four conditions.
Results: According to the results, there was a difference between the level of coordination in two conditions of without a backpack and a normal backpack, with the normal backpack showing a significant decrease in coordination (P<0.05). The results also indicated that the variability in coordination increased after using backpacks with movable hip belts and cross frames compared to walking without a backpack (P<0.05).
Conclusion: Based on the existing findings, backpacks with a cross-movable frame maintain the antiphase coordination between the trunk and pelvis by allowing freedom of movement in these two organs. It also creates more flexibility by increasing variability in coordination.

The effect of upper material in military boots on lower limb loading during walking
Abbas Farjad Pezeshk, Saeed Ilbeigi, Mohammad Reza Vafaiee,
Volume 13, Issue 2 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Background and Objectives: The role of shaft stiffness in military boots is widely recognized, yet most research focuses on quantifying stiffness rather than examining how material composition of boot shaft influences performance. This study explores how different boot materials affect kinetic parameters, comparing conventional leather boots to a hybrid leather-synthetic design to assess their impact on mobility and biomechanical efficiency.
Methods: A repeated-measures experimental design was employed, assessing twenty healthy male participants under four conditions: walking with a formal shoe and three military boot types, each featuring distinct shaft materials (two leather and one a hybrid leather-synthetic design). Ground reaction forces (GRF), rate of force development (RFD), impulse was recorded using a force plate. Statistical analysis involved repeated-measures ANOVA with Bonferroni correction.
Results: Featuring synthetic materials in the shaft, boot 3 showed reduced negative impulse, and elevated positive impulse relative to traditional leather boots during gait.
Conclusions: These findings highlight the biomechanical advantages of hybrid boot designs, suggesting that reduced shaft stiffness improves mobility and motion efficiency. The study underscores the need for optimized traditional boot materials to enhance gait performance while minimizing injury risks, particularly for military personnel.

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