Calculating the Center of Mass, and Introducing its Pattern of Changes for Adolescents in Format of Equations
- سال انتشار: 1397
- محل انتشار: مجله پژوهش در علوم توانبخشی، دوره: 13، شماره: 6
- کد COI اختصاصی: JR_JRRS-13-6_009
- زبان مقاله: انگلیسی
- تعداد مشاهده: 160
نویسندگان
PhD, Department of Physical Education and Sports Sciences, School of Literature, Humanities and Social Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
Associate Professor, Department of Motor Behavior, School of Physical Education and Sports Sciences, Alzahra University, Tehran, Iran
Associate Professor, Department of Motor Behavior, School of Physical Education and Sports Sciences, Alzahra University, Tehran, Iran
Assistant Professor, Department of Statistics and Mathematics, School of Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran
چکیده
Introduction: The center of mass is one of the most important features of the physical structure of the people, which is used in the balance tasks, screening in order to study the physical illnesses, talent acquisition, and designing safety and training devices. The aim of this study was to determine the center of mass, and investigating its changes in adolescents, to ultimately provide a fundamental, applied, and appropriate model based on the most important physical factors affecting it.Materials and Methods: Among ۱۶۱۱۳۴ adolescent students aged ۱۲ to ۱۸ years in Isfahan City, Iran, ۳۸۴ adolescents were selected through cluster sampling. Height information in lying, standing, and sitting positions, was measured using standard meter, and mass of subjects was determined with a scale, as well as the center of mass with a measurement device based on the torque principles. The most important factors affecting the center of mass were identified using stepwise multivariate regression method, according to the necessary assumptions.Results: Sitting height to stature ratio, stature height, and sitting height were the most important factors predicting the center of mass in adolescents (P < ۰.۰۰۱). The average ratio of height of the center of mass to stature was calculated as ۵۵.۴۱% for adolescents.Conclusion: A model in the form of a formula was presented to estimate the center of mass of adolescents. This is a very good alternative to estimate the center of mass, rather than using hard, time-consuming, and expensive methods.کلیدواژه ها
Body height, Students, Torque, Regression Analysisاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.