پژوهش در طب ورزشی و فناوری

ارزیابی طول گام بهینه در راه‌رفتن مدل هفت‌عضوی به روش حاشیۀ پایداری

نویسندگان

مهدیه ترمه
افشین قنبرزاده
محمدهادی هنرور
کورش حیدری شیرازی
https://doi.org/10.29252/jsmt.18.19.147
چکیده
در طراحی حرکت راه‌­رفتن، حفظ حداکثری تعادل، در کنار تأمین قیود سینماتیک و میزان انرژی مصرفی باید در کانون توجه قرار گیرد. در این پژوهش، هدف یافتن طول گام بهینه است. در این مطالعه، از یک تابع هزینۀ حداقل مصرف انرژی و هزینۀ افتادن استفاده شد. تابع هزینۀ افتادن با استفاده از مفهوم حاشیۀ پایداری و کمیت شاخص تعادل طراحی شد. برای بررسی وضعیت تعادل و بازسازی الگوی حرکتی، از حرکت راه‌­رفتن طبیعی آزمودنی‌­های سالم داده‌­برداری شد و الگویی هفت‌­لینکی تعریف شد. در این پژوهش، مناسب‌­ترین طول گام برای فرد با قد و وزن و مشخصات دورۀ راه‌­رفتن معلوم به‌­دست آمد. برای مثال، طول گام بهینه در راه‌­رفتن فردی با قد 187 سانتی‌­متر و جرم 92 کیلوگرم، 54 سانتی­متر است. در این پژوهش با تحلیل راه­‌رفتن فرد، ویژگی‌­های سینماتیکی و سینتیکی الگوی حرکتی او تشخیص داده شد. با محاسبۀ شاخص تعادل، به فرد در یافتن طول گام بهینه‌­ای که به‌­ازای آن تعادل بیشینه می‌­شود، کمک شده است. نتایج این مطالعه می‌­تواند طول گام بهینه را با هدف اصلاح الگوی راه­‌رفتن تعیین کند.

کلیدواژه‌ها

تعادل وضعیت ایستاده
معیار حاشیۀ پایداری
فاز حمایت یگانه
دورۀ راه‌رفتن
طول گام

عنوان مقاله English

Evaluation of optimal step length in a seven-link model with margin of stability method

نویسندگان English

M Termeh
A Ghanbarzadeh
M.H Honarvar
K Heidari Shirazi
چکیده English

In a walking cycle design, maximizing the upright balance should be considered in addition to the kinematic constraints, energy consumption rate must be considered. The purpose of this study is to find the optimal step length obtained for each person according to the physical features. In this research, in order to minimize energy consumption rate by considering maximum balance two cost function were defined. the fall cost function was designed based on the concept of MOS and balance index. To investigate the upright balance and to reconstruct the movement pattern, Data from normal walking gait of healthy subjects was taken and seven links model was defined. In this study, the optimal step length was obtained for the person with height, weight and gait cycle characteristics. it is shown that for a person of 92kg mass and 1.87 meters height, the best step length in walking would be 0.54 meters. In this study, the kinematic and kinetic characteristics of human motion were identified by the analysis of gait patterns on a treadmill. Through the calculation of the balance index, individuals are helped to find the optimal step length for which the maximum balance is achieved. The results of the study can provide the optimal step length to correct the gait pattern.

کلیدواژه‌ها English

Upright Balance
Margin of Stability
Single Support Phase
Gait Cycle
Step Length
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