Volume 12, Issue 2 (Spring 2022)                   PTJ 2022, 12(2): 65-76 | Back to browse issues page

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1- Department of Physical Education and Sport Science, Faculty of Physical Education and Sports Sciences, Islamic Azad University of Karaj, Karaj, Iran.
2- Department of Sports Biomechanics, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
Abstract:   (1404 Views)
Purpose: Due to the paucity of information regarding the lower limb biomechanics in running at slow speed, as well as the concentration of most previous studies on a single movement plane, this study aimed to investigate lower limb joint kinetics with increasing running speed.
Methods: Twenty-eight runners were asked to stay on the treadmill at a bent velocity which was incrementally increased to 2.5 m/s, 3.5 m/s, and 4.5 m/s speeds. The three-dimensional joint moment and sagittal mechanical muscle power of the lower limb were calculated during the stance phase of running. Repeated measures analysis of variance (ANOVA) with Bonferroni post hoc test was used to examine the variables during running at various speeds.
Results: The results showed that at the hip joint in the frontal plane, an adduction moment developed in the middle of the stance phase, and the highest peak adduction moment was obvious at the highest speed condition (4.5 m/s). Also, the time elapsed to peak in the highest speed condition was less than the others. In the transverse plane, although the 3.5 m/s-speed condition experienced the maximum external rotation peak moment, the 4.5 m/s-condition speed reached the internal status earlier than the two other speeds. In the sagittal plane, the highest speed condition showed the highest extension and flexion moments.
Conclusion: Increasing running speed in runners leads to more kinetic output and mechanical power gradient.
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Type of Study: Research | Subject: General
Received: 2021/12/4 | Accepted: 2022/05/14 | Published: 2022/04/1

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