Document Type : Original article
Authors
1
Department of Health and Sports Medicine, Faculty of Physical Education and Sports Sciences, University of Tehran, Tehran, Iran
2
Health and Sports Medicine Department, Faculty of Physical Education and Sport Sciences, University of Tehran, Tehran, Iran
3
Kinesiology Department, Bu Ali Sina University, Hamadan, Iran.
Abstract
Background and Aims: hyper lumbar lordosis is one of the deformity of the spine, which causes changes in the center of gravity forward and increases the movement of the pelvis, and is also a factor that changes the stability of the trunk, lumbo-pelvic-hip, and lower limbs. Therefore, the aim of this study, is to compare the changes in the COP and TTS in football players with and without hyper lumbar lordosis during single leg jump-landing.
Materials and Methods: The current research is comparative, practical and in terms of design; It was cross-sectional, so that 28 people (into two groups of 14 people with and without hyper lordosis) male football players according to the entry and exit criteria, with an average age of 24±2.42 years, an average height of 178±6.06 cm and average weight of 72±4.93 kg were selected. First, the Sargent's jump was taken from them in order to determine the maximum vertical jump, and then the subjects jumped with half of their maximum jump with two legs and landed on the force plate with the dominant leg. Independent t-test analysis was used to analyze the results using SPSS software.
Results: A significant difference between the COP fluctuations in the internal-external direction (P=0.015), the maximum and minimum displacement of the COP in the internal-external direction (P=0.021, P=0.001), and the TTS the internal-external and total (P=0.001), was observed in two groups, but no significant difference was found in other variables (P≤0.05).
Conclusion: It seems that changes in the sagittal plane in the area of the lumbar spine and pelvis cause instability and loss of balance in the frontal plane in the lower limbs. Therefore, it is expected that the athletes who have instability in the lower limb should pay more attention and focus on the changes that happened in the proximal region in order to prevent instability and damage in the lower limb to some extent.
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