مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تاثیر محل صندلی بر دامنه‌ی حرکتی مفصل‌ها و سرعت انقباض عضله‌های پا در دوچرخه‌ی ثابت: مطالعه‌ی پارامتریک

نویسندگان
الهام حضرتی 1
محمود رضا آذغانی 2
1 دانشکده مهندسی پزشکی، دانشگاه صنعتی سهند
2 دانشیار دانشکده مهندسی مکانیک دانشگاه صنعتی سهند تبریز
چکیده
دال زدن به عنوان یکی از روش‌های درمانی پرکاربرد در بازتوانی شناخته شده‌است. که، تحت تاثیر عامل‌های مختلفی قرار می‌گیرد. هدف در این مطالعه، بررسی اثر تغییر موقعیت و ارتفاع صندلی (به‌ترتیب، فاصله‌ی افقی و عمودی صندلی تا پدال) در محدوده‌ی محل‌های ممکنه‌ی پدال زدن (محدوده‌ی ارتفاع صندلی: 49-80% طول پا) بر دامنه‌ی حرکتی مفصل‌ها و سرعت انقباض عضله‌های اندام تحتانی است. بدین‌منظور، از مدل اسکلتی-عضلانی ارایه شده در نرم‌افزار انی‌بادی استفاده شد. شرایط پدال زدن در دوچرخه‌ی ثابت در مدل فراهم شد (طول بازوی پدال و نرخ پدال زدن به‌ترتیب، cm 17.5 و rpm 80). نتایج نشان داد که محدوده‌ی حرکتی مفصل‌های مچ پا، زانو و ران به‌ترتیب 11.08-37.54 (انحراف معیار: 0.03-1.86)، 69.61-80.58 (انحراف معیار: 4.02-9.76) و 42.89-46.13 (انحراف معیار: 0.07-2.89) است. اثر تغییر ارتفاع صندلی بر محدوده‌ی حرکتی مفصل مچ پا> زانو>ران و اثر تغییر موقعیت صندلی بر محدوده‌ی حرکتی مفصل زانو>ران>مچ پا است. با افزایش ارتفاع صندلی، محدوده‌ی حرکتی مفصل‌های مچ پا و زانو به طور قابل توجهی افزایش یافتند. همبستگی مثبت بین تغییر زاویه‌ی مفصل‌های مچ پا-زانو، مچ پا-ران و زانو-ران هماهنگی و همکاری مفصل‌ها در طول سیکل پدال زدن را نشان داد. سرعت انقباض عضله‌های اندام تحتانی تحت تاثیر تغییر محل صندلی قرار می‌گیرند. به ویژه عضله‌های گروه مچ پا، زانو و دومفصلی با تغییر محل صندلی در محل‌های ممکنه، در بازه‌ی بزرگی تغییر می‌کنند.
کلیدواژه‌ها
شبیه‌سازی
پدال زدن
محل صندلی
دامنه‌ی حرکتی مفصل‌ها
سرعت انقباض عضله‌ها

موضوعات

عنوان مقاله English

Saddle place effect on the leg joints range of motion and muscles contraction velocity in ergometer: parametric study

نویسندگان English

Elham Hazrati 1
Mahmood Azghani 2
1 Biomedical Eng., Sahand university of technology
چکیده English

Pedaling is recognized as one of the most widely used therapies in rehabilitation. Which is influenced by various factors. Studying the effect of saddle position and saddle height (horizontal and vertical distance of saddle from pedal, respectively) changes in the pedaling feasible places range (saddle height range: 49-80% of leg length) on the leg joints range of motion and muscles contraction velocity are the purposes of this study. The pedaling conditions with ergometer are obtained in the model (crank arm length and pedaling rate are 17.5 cm and 80 rpm, respectively). Results indicate that ankle, knee and hip joints range of motion are 11.08-37.54 (SD: 0.03-1.86), 69.61-80.58 (SD: 4.02-9.76) and 42.89-46.13 (SD: 0.07-2.89), respectively. The effect of saddle height changes on ankle>knee>hip and the effect of saddle position changes on knee>hip>ankle range of motion. By increasing the saddle height, ankle and knee joints range of motion increase significantly. The positive correlation between ankle-knee, ankle-hip and knee-hip joints, show the coordination and the cooperation of joints during cycling. The saddle place changes affect the contraction velocity of lower limb muscles. In particular, by changing the saddle place in the feasible places, the contraction velocity of ankle, knee and biarticular muscle groups change in a wide range.

کلیدواژه‌ها English

simulation
Pedaling
Saddle Place
Joints Range of Motion
Muscles Contraction Velocity
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مهندسی مکانیک مدرس
دوره 18، شماره 9
دی 1397
صفحه 91-99