نوع مقاله : مقاله پژوهشی
نویسندگان
1 . استادیار بیومکانیک ورزشی، گروه آسیب‌شناسی و حرکات اصلاحی، دانشکدۀ علوم ورزشی، دانشگاه اصفهان، اصفهان، ایران
2 کارشناس ارشد بیومکانیک ورزشی، دانشکدۀ علوم ورزشی، دانشگاه اصفهان، اصفهان، ایران
چکیده
تنه و عضلات آن در حفظ مکانیک راه رفتن نقشی مهم ایفا می‌کنند. خستگی و ضعف این عضلات می‌تواند مکانیک راه رفتن را تحت تأثیر قرار دهد. مسیر مرکز فشار حین راه رفتن منعکس‌کنندۀ مکانیک کلی بدن است. هدف از مطالعۀ حاضر بررسی اثر خستگی عضلات ناحیه تنه روی مسیر مرکز فشار حین راه رفتن بود. تعداد 20 نفر دانشجوی زن در این مطالعه شرکت کردند. از شرکت‌کنندگان خواسته شد تا با سرعت خودانتخابی مسیر راه رفتن را در شرایط قبل و پس از خستگی عضلات تنه طی کنند. در وسط مسیر راه رفتن، یک دستگاه فوت اسکن قرار داده شده بود. اطلاعات مربوط به مسیر مرکز فشار، مدت‌زمان نسبی فازهای استانس و زاویۀ پیش‌روی در دو حالت قبل و پس از خستگی با استفاده از دستگاه فوت اسکن اندازه‌گیری شد. پس از خستگی مدت‌زمان نسبی فاز تماس اولیه افزایش و مدت‌زمان نسبی فاز تماس جلوی پا کاهش پیدا کرد. پس از خستگی، در فازهای صاف شدن جلوی پا و پوشآف جلوی پا مسیر مرکز فشار خارجی‌تر شده و زاویۀ پیش‌روی کاهش پیدا کرد. با توجه به یافته‌های پژوهش حاضر می‌توان گفت خستگی و ضعف عضلات ناحیه تنه تغییراتی در مکانیک راه رفتن می‌شود. این تغییرات می‌تواند افراد را در معرض آسیب‌هایی قرار دهد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Effect of trunk muscles fatigue on the trajectory of center of pressure during walking
نویسندگان [English]
- Hamed Esmaeili 1
- Zahra Askari 2
1 Department of Sport Injuries and Corrective Exercises, Faculty of Sport Sciences, University of Isfahan, Isfahan, Iran
2 MSc in Sport Biomechanics
چکیده [English]
The trunk and its muscles play an important role in maintaining walking mechanics. Fatigue and weakness of these muscles could affect walking mechanics adversely. The trajectory of the center of pressure (COP) reflects whole body mechanics. The aim of this study was to investigate the effect of trunk muscles fatigue on the trajectory of the COP during walking. Totally, 20 female academic students participated in this study. Participants were asked to walk on the walkway before and after trunk muscles fatigue with self-selected speed. In the midway of the walkway, a footscan pressure mat was mounted. The COP trajectory, relative timing of stance phases and foot progression angle were recorded using footscan in pre- and post-fatigue conditions. After fatigue, the relative time of the initial contact phase increased and the relative time of forefoot contact phase decreased. Trunk muscle fatigue lateralized the COP trajectory in the Forefoot Flat Phase and Forefoot Push-off Phase and decreased foot progression angle. According to the results of the current study, it can be concluded that fatigue and weakness of trunk muscles lead to changes in walking mechanics. These changes could expose people to the risk of injury.
کلیدواژه‌ها [English]
- Trunk muscles
- Walking
- Center of pressure trajectory
- Foot progression angle
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