Document Type : Original Articles

Authors

• Amir Ali Jafarnezhadgero ¹
• Nader Farahpour ²
• Mohsen Damavandi ³

¹ PhD Candidate, Department of Sports Biomechanics, School of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamedan, Iran

² Professor, Department of Sport Biomechanics, School of Physical Education and Sport Sciences, Bu-Ali Sina University, Hamedan, Iran

³ Assistant Professor, Department of Sports Biomechanics, School of Physical Education and Sport Sciences, Hakim Sabzevari University, Sabzevar, Iran

Abstract

Introduction: Evaluation of ground reaction forces (GRF) and other kinetic parameters have clinical importance. These parameters may cover all possible interaction between shoe type and insole. This study aimed to investigate the immediate effects of arch support insole on GRF and their peak time, impulse, loading rate, and free moment during stance phase of gait in normal individuals.Materials and Methods: Sixteen healthy male subjects with mean ± SD age; 29.4 ± 4.8 years, mean ± SD mass; 77.9 ± 12.6 kg and mean ±SD height; 176.5 ± 5.8 cm were participated in this study. All parameters were measured using two adjacent Kistler force plates (1000Hz) during stance phase of walking in two different conditions: with and without shoe insole. Maximum GRF and their related peak time, impulse, loading rate, and free moment were recorded. Repeated measure ANOVA was used to analyze the data (α = 0.05).Results: Wearing insole caused reduction the peak vertical GRF (PvGRF) in heel contact phase by 6.9% of body weight (BW) (P = 0.001) and the loading rate (8.4%, P = 0.02). However, it increased the propulsive force (7% N/BW, P = 0.001), anterior-posterior impulse by 1.2% BW (P = 0.003) and normal impulse by 2% of BW (P = 0.032).

Keywords

• Gait
• Ground reaction force
• Impulse
• Loading rate
• Free moment
• Insole