KMAN Publication Inc. International Journal of Sport Studies for Health 2588-5782 8 Serial Number 21 2025 04 01 Alterations in Ground Reaction Force Frequency Content During Walking and Running in Recreational Runners with a History of COVID-19 Compared to Healthy Controls Alterations in Ground Reaction Force Frequency Content During Walking and Running in Recreational Runners with a History of COVID-19 Compared to Healthy Controls 40 46 10.61838/kman.intjssh.8.2.6 EN Journal Article <table> <tbody> <tr> <td> <p><strong>Objective:</strong> Despite the prevalence of chronic symptoms of COVID-19 and pathological changes that may affect gait and functional mobility in people with a history of COVID-19. No studies have investigated the ground reaction force frequency in recreational runners with history of COVID-19 differed compared to healthy controls.</p> <p><strong>Methods and Materials:</strong> The study involved 14 female adults with history of COVID-19 and 14 healthy age-matched controls. Ground reaction forces were recorded during barefoot walking (~ 1.2 m/s) and running (~ 3.2 m/s) at constant speed.</p> <p><strong>Results:</strong> Significant differences in key frequency components in the anterior-posterior direction were observed between the COVID-19 and healthy groups during running (p=0.036).  Also, Significant differences in key frequency components in the medio-lateral direction were observed between the COVID-19 and healthy groups during walking (p=0.005).</p> <p><strong>Conclusion</strong>: Lower essential number of harmonics in the medio-lateral direction during walking and higher essential number of harmonics in anterior-posterior direction during running may be attributed to decreased muscle membrane excitability, slowing of nerve conduction velocities, and axonal degeneration directly impacting skeletal muscle activation, and in turn its function.</p> </td> </tr> </tbody> </table> https://www.journals.kmanpub.com/index.php/Intjssh/article/download/3771/6861