پژوهش در طب ورزشی و فناوری

تأثیر خستگی عمومی بر کار و توان جذبی عضلات مفصل زانو طی مرحله اتکای دویدن

نویسندگان

منصور اسلامی
محسن نظری
چکیده
فعالیت­های فیزیکی مداوم، بدن را در سطوح مختلف خستگی قرار می­‌دهد. خستگی یکی از پیامدهای جدایی­‌ناپذیر اکثر فعالیت‌­های ورزشی بوده که ممکن است منجر به تغییراتی در عملکرد تولید و جذب نیرو در عضلات شود. هدف از پژوهش حاضر، تاثیر دویدن در حالت واماندگی بر توان جذبی و کار عضلات زانو طی مرحله اتکای دویدن بود . 16دانشجوی مرد با میانگین سن2/27±22سال، قد 5/47±177سانتیمتر و جرم 8/4±72/6 کیلوگرم به­‌صورت داوطلبی شرکت داشتند. داده­‌های سینماتیکی و سینتیکی با استفاده از دوربین ویدئویی و صفحه نیروسنج ثبت شد. توان و کار منفی و مثبت عضلات عمل‌کننده بر زانو، با استفاده از معادلات دینامیک معکوس در نرم­‌افزار2010 MATLAB محاسبه شد. آزمون فرضیات با استفاده از آزمون T زوجی (تی همبسته) انجام شد (0/05≤p). نتایج نشان­داد، اوج توان منفی و کار منفی پس از خستگی به‌­طور معناداری به ترتیب 33/78% و 22/6% کاهش یافت. با وجود اینکه اوج توان مثبت به­‌طور معناداری کاهش یافت (0/05≤p) اما کار مثبت تغییر معناداری نداشت (0/644p=). نتایج این پژوهش نشان­داد که پس از خستگی، عملکرد جذب ضربه برخوردی در مرحله اتکای دویدن از سوی عضلات کاهش­یافته، که این کاهش ممکن است منجر به افزایش خطر آسیب­های دویدن شود.

کلیدواژه‌ها

خستگی عمومی
کار مفصلی
توان جذبی
دویدن

عنوان مقاله English

Effect of general fatigue on knee join muscle work and power absorption during stance phase of running

نویسندگان English

Mansour Eslami
Mohsen Nazari
چکیده English

All sustained physical activities subject the body to various levels of fatigue. This is especially evident when running, which is one of the most popular forms of exercise and may be described as a reduction in maximum force production and power output . the purpose of this study was to investigate the effect of running in an exerted state on knee muscles power absorption and work during the stance phase of running. Sixteen healthy physical education male students with an average age 22 and SD 2.27 years and height 177 and SD 5.47 cm and mass 72.6 and SD 8.4 kg participated in this study voluntary. Kinetic and kinematic data recorded by using of video camera and force plate. The negative and positive power and work of muscles operating on knee has calculated using inverse dynamic equations in MATLAB2010 Software. Paired sample T test was done to statistical analysis in SPSS 2010 software (p≤0.05). The results of this study indicated that negative peak power and work significantly decreased 33.78% and 22.6% respectively. Although the positive peak power significantly decreased (p≤0.05), positive work didn’t change significantly (p=0.644). The results of this research indicated that the absorbing function of the muscles is decreased following fatigue and may be led to increase the injury risk of running.

کلیدواژه‌ها English

General Fatigue
Joint Work
Absorbing Power
Running
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