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Showing 4 results for Kinetics
Milad Piran Hamlabadi , Amir Ali Jafarnezhadgero ,
Volume 24, Issue 1 (3-2022)
Abstract
Background and Objective: Back pain is a common orthopedic disease that affects up to 80% of the population at some point in life. Brace is one of the tools that used to reduce pain. The relationship between brace application and gait parameters in people with low back pain is not well understood. This study was done to determine the effects of simple and sensor thoracolumbosacral braces on gait kinetics in patients with low back pain.
Methods: This quasi-experimental study was performed on 15 men and women with low back pain in the biomechanics laboratory of Mohaghegh Ardabili University Health Center in nort-west of Iran during 2020. Each participant performed three gait conditions including without brace, with sensory brace and with simple brace. Ground reaction forces were recorded and compared by a force plate while walking.
Results: The average walking speed during no brace, simple brace and sensor braces were not significant different. Also, results did not demonstrate any significant effect of simple or sensor braces on ground reaction force amplitudes, their time to peak, and free moment values.
Conclusion: Simple and sensory thoracolumbosacral brace did not effect on gait kinetics in low back patients.
Leila Sabouri , Abbas Meamarbashi , Mohsen Barghamadi , Zeljko Zilic , Amir Fatollahi ,
Volume 27, Issue 1 (3-2025)
Abstract
Background and Objective: Patellofemoral pain syndrome (PFPS) is among the common causes of anterior knee pain in adolescents and individuals under 60 years of age. This study was conducted to determine the effect of closed kinetic chain exercises on changes in plantar foot pressure dynamics in women with PFPS.
Methods: This quasi-experimental study was conducted on 30 female university students aged 20 to 35 divided into two groups of 15 (one group diagnosed with PFPS and a healthy control group) at Mohaghegh Ardabili University in 2023. The PFPS group had a pain history of at least two months to a maximum of one year. The experimental group performed closed kinetic chain exercises three times a week for eight weeks. Plantar foot pressure variables were measured using a pressure foot scanner (sampling rate of 300 Hz).
Results: The peak forces in the first toe during slow-speed running exhibited a statistically significant decrease in both the healthy group (64.91 ± 28.69) and the PFPS group (215.19 ± 60.28). Furthermore, the time to reach the peak ground reaction force in the PFPS group (49.65 ± 44.332) showed a statistically significant increase during the post-test at slow-speed running (P<0.05). The external heel force (153.97±3.62) and the fifth metatarsal bone (65.19±19.77) in the healthy group demonstrated a statistically significant reduction in the post-test compared to the PFPS group during fast-speed running (P<0.05). In both the healthy and PFPS groups, statistically significant decreases were observed in the post-test for center of pressure (COP) displacement variables in the mediolateral and anteroposterior directions during both slow-speed and fast-speed running (P<0.05). Additionally, in the healthy group, a statistically significant reduction was found in the post-test for COP displacement at the first toe (64.5±51.08) during fast-speed running (P<0.05).
Conclusion: Closed kinetic chain exercises lead to a statistically significant reduction in plantar foot pressure variables in women with PFPS and healthy women.
Amir Ali Jafarnezhadgero , Ehsan Fakhri Mirzanag , Farhad Rezazadeh ,
Volume 28, Issue 1 (3-2026)
Abstract
Background and Objective: Obesity is a major public health concern worldwide. Evidence suggests that fatigue can lead to significant alterations in mechanical components among obese individuals compared to their healthy counterparts. The present study aimed to determine the effect of fatigue on the mechanical values of impulse and center of pressure (COP) in obese individuals with pronated feet during a landing maneuver.
Methods: This quasi-experimental study was conducted in Ardabil Province, Iran, on 16 male students with healthy feet and normal body mass indices (BMIs<25) and 15 obese male students (BMI>30) with pronated feet. During the test, mechanical variables were recorded for both groups before and after implementing the fatigue protocol, utilizing a force plate (sampling rate: 1000 Hz) during a landing maneuver.
Results: In the between-group comparison, the mechanical impulse values along the anteroposterior axis were significantly higher in the “healthy feet with normal BMIs” group (34.69±17.9) compared to the “obese with pronated feet” group (9.41±2.07) (P<0.05). In the within-group comparison of “obese students with pronated feet”, no statistically significant differences were found before and after the fatigue protocol during a landing maneuver for the mechanical variables of vertical impulse, anteroposterior impulse, mediolateral impulse, mediolateral COP, and anteroposterior COP.
Conclusion: In the mechanical components of impulse, the “obese with pronated feet” group exhibited a statistically significant decrease compared to the “healthy feet with normal BMIs” group during a landing maneuver; however, the fatigue protocol did not alter the impulse values.
Hamed Sheikhalizadeh , Amir Ali Jafarnezhadgero , Abbas Memarbashi , Sara Imani Bruoj , Afsaneh Enteshari Moghaddam ,
Volume 28, Issue 2 (7-2026)
Abstract
Background and Objective: Anterior cruciate ligament rupture is among the most common sports injuries and has substantial consequences for function, return to sport, and knee-joint health. This study aimed to determine the effect of a fatigue protocol on the frequency spectrum of ground reaction forces during running in men with pronated feet following anterior cruciate ligament reconstruction.
Methods: This clinical trial was conducted at the University of Mohaghegh Ardabili and included 15 men with pronated feet who had undergone anterior cruciate ligament reconstruction and 15 healthy men. Participants in the intervention group had undergone unilateral anterior cruciate ligament reconstruction using a hamstring autograft 4-8 months before the study. Participants first ran along an 18-m track while ground reaction forces were recorded using a force plate positioned at the midpoint. After completing the fatigue protocol, ground reaction force data were recorded again during running.
Results: Changes in the 99.5% power frequency of the mediolateral (2.72±2.31) and anteroposterior (2.35±1.11) ground reaction force components were greater in the intervention group than in the healthy group (-1.24±2.96 and -1.42±4.17, respectively; P<0.05). Within-group analysis showed that the 99.5% power frequency values for the mediolateral ground reaction force component after fatigue in the anterior cruciate ligament reconstruction group with pronated feet (16.16±1.75 and 12.00±1.98, respectively) were higher than the corresponding values before fatigue (13.85±2.36 and 10.16±2.26, respectively) (P<0.05).
Conclusion: Fatigue may affect balance control, particularly in individuals who have undergone anterior cruciate ligament reconstruction. Reduced balance may also decrease running speed.
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