اثرات استفاده طولاني مدت از كفش كنترل حركتي روي طيف فركانس نيروهاي عكس العمل زمين طي دويدن در دونده هاي پاي پرونيت

Investigating the Effects of Long-Term Use of Motion Control Shoes on the Frequency Spectrum of Ground Reaction Force during Running in the Runners with Pronated Feet

عوامل گوناگوني مي تواند فعاليت ورزشكاران را تحت تاثير قرار دهد كه يكي از اين عوامل مهم، پرونيشن بيش از حد پا مي باشد. هدف از پژوهش حاضر، بررسي اثر استفاده طولاني مدت از كفش كنترل حركتي روي طيف فركانس نيروهاي عكس العمل زمين در افراد داراي پاي پرونيت طي دويدن مي باشد. مواد و روش ها پژهش حاضر از نوع نيمه تجربي و آزمايشگاهي بود. 30 دونده مرد داراي پاي پرونيت در دو گروه كنترل و تجربي قرار گرفتند. از صفحه نيروي برتك جهت ثبت نيروهاي عكس العمل زمين استفاده شد. گروه كنترل از كفش معمولي (Supernova Control, Adidas) و گروه تجربي از كفش كنترل حركتي (Supernovacushion, Adidas) به مدت 5 ماه در تمرينات خود استفاده كردند. آزمون ناپارامتريك ويلكاكسون جهت تحليل آماري در سطح معناداري 05/0 استفاده شد. يافته ها نتايج پژوهش حاضر در گروه تجربي نشان دهنده ي اين بود كه مولفه ي فركانس توان 99/5 درصد در راستاي عمودي طي پس آزمون در مقايسه با پيش آزمون كاهش معناداري داشت (0/023=P). در راستاي داخلي-خارجي نيز مولفه ي باند فركانس طي پس آزمون در مقايسه با پيش آزمون افزايش معناداري را نشان داد (0/041=P). ساير مولفه هاي طيف فركانس نيروهاي عكس العمل زمين هيچ گونه تفاوت معناداري را در گروه تجربي نشان ندادند (0/05

Background and Aims: Various factors can affect athletes’ performance one of which is over pronation of the foot. The purpose of the present study was to investigate the effects of long-term use of motion control shoes on the frequency spectrum of ground reaction force during running in runners with pronated feet. Materials and Methods: The current study was a semi-experimental and laboratory investigation. The sample consisted of 30 male runners with pronated foot who were divided into experimental and control groups. The Bertec force plate was used to record ground reaction forces. Control group used normal shoes (Supernova control, Adidas) and experimental group used the motion control shoes (Supernovacushion, Adidas) during five months in their training sessions. Non-parametric Wilcoxon test was used for statistical analysis at the significance level of 0.05. Results: The results of the experimental group showed that the frequency component with a power of 99.5% in vertical direction during the post-test compared with the pre-test was significantly decreased (P=0.023). In the medio-latral direction, the frequency band component during the post-test showed a significant increase compared to the pre-test (P=0.041). Other components of the frequency spectrum of ground reaction forces have no significant difference in the experimental group (P<0.05). Conclusion: Regarding the results, it can be argued that long-term use of motion control shoes can help maintain lower limb stability and balance in runners, as well as improve performance in them. Also, the frequency band showed a significant increase, which increased the pain in motor components and connective tissues, and this increase could be due to the increase in using these components in motion. Therefore, it can be described as a negative effect on the long-term use of motion control shoes.