Shahid Beheshti University of Medical Sciences The Scientific Journal of Rehabilitation Medicine 2251-8401 9 2 2020 06 21 Effect of Fatigue at the Heart Rate Deflection Point on the Frequency Components of Ground Reaction Forces during Walking in Individuals with Pronated Feet Effect of Fatigue at the Heart Rate Deflection Point on the Frequency Components of Ground Reaction Forces during Walking in Individuals with Pronated Feet 228 238 1100845 10.22037/jrm.2019.111901.2122 FA Ahmad Fasihi PhD Student of Sport Physiology, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran 0000-0002-3556-0572 Marefat Siahkouhian PhD, Professor of Sport Physiology, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran 0000-0001-8729-7473 Hamed Sheikhalizade MSc of Sport Biomechanics, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran 0000-0000-0000-0000 AmirAli Jafarnezhadgero PhD, Assistant Professor of Sport Biomechanics, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran 0000-0002-2739-4340 Journal Article 2019 05 22 <strong>Background and Aims:</strong> A pronated foot is one of the lower limb malalignments which can lead to running related injuries. Another cause of running related injuries is running induced fatigue. The aim of the current study was to investigate the interaction effect of both pronated foot and fatigue at the heart rate deflection point on the frequency spectrum of ground reaction forces during walking. <br /><strong>Materials and Methods:</strong> Participants were assigned into two healthy (number=15) and pronated foot (number=15) groups. A Bertec force platform was used to record the ground reaction forces during barefoot walking before and after fatigue in heart rate deflection point. Ground reaction force was measured in vertical, anterior-posterior, and medio-lateral directions. Two way ANOVA with repeated measure was used for statistical analysis. <br /><strong>Results:</strong> The results showed significant Group by Fatigue interaction effect for the frequency with power 99.5% in the anterior-posterior ground reaction force (p=0.030, ƞ²=0.181). Also, the significant Group by Fatigue interaction effect for the frequency with the power 99.5% in the vertical direction (p=0.018, ƞ²=0.212) was observed. In addition, findings demonstrated significant Group by Fatigue interaction effect for the number of essential harmonics in the free moment curve (p=0.044, ƞ²=0.158). <br /><strong>Conclusion:</strong> According to the results, the interaction of both pronated foot and fatigue could be a risk factor for running injuries. <strong>Background and Aims:</strong> A pronated foot is one of the lower limb malalignments which can lead to running related injuries. Another cause of running related injuries is running induced fatigue. The aim of the current study was to investigate the interaction effect of both pronated foot and fatigue at the heart rate deflection point on the frequency spectrum of ground reaction forces during walking. <br /><strong>Materials and Methods:</strong> Participants were assigned into two healthy (number=15) and pronated foot (number=15) groups. A Bertec force platform was used to record the ground reaction forces during barefoot walking before and after fatigue in heart rate deflection point. Ground reaction force was measured in vertical, anterior-posterior, and medio-lateral directions. Two way ANOVA with repeated measure was used for statistical analysis. <br /><strong>Results:</strong> The results showed significant Group by Fatigue interaction effect for the frequency with power 99.5% in the anterior-posterior ground reaction force (p=0.030, ƞ²=0.181). Also, the significant Group by Fatigue interaction effect for the frequency with the power 99.5% in the vertical direction (p=0.018, ƞ²=0.212) was observed. In addition, findings demonstrated significant Group by Fatigue interaction effect for the number of essential harmonics in the free moment curve (p=0.044, ƞ²=0.158). <br /><strong>Conclusion:</strong> According to the results, the interaction of both pronated foot and fatigue could be a risk factor for running injuries. https://medrehab.sbmu.ac.ir/article_1100845_ea06bd55ef1b7f74a81e9620075aca87.pdf