اثر خستگی موضعی عضلات چهارسررانی در سرعت های مختلف حرکت فلکشن/اکستنشن بر کینتیک مفصل زانوی فوتبالیست های مرد

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد بیومکانیک ورزشی، گروه تربیت بدنی و علوم ورزشی، دانشکده علوم تربیتی و روانشناسی، دانشگاه محقق اردبیلی، اردبیل، ایران

2 استادیار بیومکانیک ورزشی، گروه تربیت بدنی و علوم ورزشی، دانشکده علوم تربیتی و روانشناسی، دانشگاه محقق اردبیلی، اردبیل، ایران

3 استادیار بیومکانیک ورزشی، دانشکده روانشناسی و علوم تربیتی، دانشگاه محقق اردبیلی، اردبیل، ایران.

چکیده

مقدمه و اهداف
فوتبال یکی از ورزش­های پرطرفدار در جهان است که در دقایق پایانی کاهش عملکرد و افزایش آسیب اندام تحتانی در پی خستگی عضلانی را به دنبال دارد. هدف از پژوهش حاضر بررسی اثر خستگی موضعی عضلات چهارسررانی در سرعت­های مختلف حرکت فلکشن/اکستنشن بر کینتیک مفصل زانوی فوتبالیست­های مرد بود.
مواد و روش­ ها
پژوهش حاضر از نوع نیمه­تجربی بود. در این پژوهش 20 فوتبالیست مرد (سن: 29/2±90/22 سال) به صورت داوطلبانه شرکت کردند. جهت اندازه­گیری متغیرهای بیومکانیکی از دستگاه دینامومتر ایزوکنتیک (Gymnex ISO 2) در سرعت­های زاویه­ای 60، 180 و 360 درجه بر ثانیه و هر کدام 3 تکرار حرکت فلکشن و اکستنشن زانو استفاده شد. از آزمون­های شاپیرو-ویلک جهت بررسی داده­ها و از آزمون تی­همبسته و آنالیز واریانس دوسویه برای تحلیل داده­ها استفاده شد (05/0p<).
یافته ­ها
نتایج نشان داد که در سرعت زاویه­ای 60 درجه بر ثانیه، بعد از اعمال خستگی اوج توان اکستنسوری در مقایسه با قبل از اعمال خستگی کاهش داشت (002/0=p). همچنین اثر عامل سرعت بر متغیرهای اوج گشتاور اکستنسوری (001/0>p)، اوج گشتاور فلکسوری (001/0>p)، اوج گشتاور نسبی اکستنسوری (001/0>p)، اوج گشتاور نسبی فلکسوری (001/0>p)، زاویه اوج گشتاوری اکستنسوری (048/0=p)، اوج توان اکستنسوری (003/0=p)، اوج توان فلکسوری (001/0>p)، اوج کار اکستنسوری (001/0>p)، اوج کار فلکسوری (001/0>p)، کل کار اکستنسوری (001/0>p)، کل کار فلکسوری (001/0>p) و نسبت قدرت فلکسوری به اکستنسوری (001/0>p) معنادار بود.
نتیجه­ گیری
نتایج پژوهش حاضر نشان داد اوج توان اکستنسوری در سرعت زاویه­ای 60 درجه بر ثانیه بعد از خستگی کاهش یافت که احتمالا یکی از دلایل کاهش عملکرد بازیکنان فوتبال در دقایق پایانی مسابقه کاهش توان اکستنسوری می­باشد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Quadriceps Muscular Fatigue on Knee Joint Kinetics at Different Flexion/Extension Velocities in Male Soccer Players

نویسندگان [English]

  • Mohammad Abdollahpour Darvishani 1
  • Mohsen Barghamadi 2
  • AmirAli Jafarnezhadgero 3
1 Master of Science Student of Sport Biomechanics, Department of Physical Education and Sport Sciences, Faculty of Education Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
2 Department of Physical Education and Sport Sciences, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.
3 Department of Physical Education and Sport Science, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Background and Aims: The purpose of the current study was to investigate the effect of quadriceps muscular fatigue on knee joint kinetics and kinematics in professional soccer players.
Materials and Methods: In the present semi-experimental study, 20 male soccer players (age: 22.90±2.29 years) volunteered to participate. Isokinetic dynamometer (Gymnex ISO 2) was used to measure biomechanical variables during 60, 180, and 360 degree/s angular velocities, each including three repetitions of different flexion/extension velocities. Shapiro-Wilks goodness-of-fit test was used for normality and paired samples t-Test and Two-Way analysis of Variance were used for data analysis (p<0/05).
Results: The results showed that there was a significant reduction in the peak extensor power in angular velocity of 60 degrees/s after fatigue as compared to before fatigue (p=0.002). Also, there was significant effects of velocity factor on peak extensor torque (P<0.001), peak flexor torque (P<0.001), peak extensor ratio torque (P<0.001), peak flexor ratio torque (P<0.001), peak extensor angle torque (P=0.048), peak extensor power (P=0.001), peak flexor power (P=0.003), peak extensor work (P<0.001), peak flexor work (P<0.001), total extensor work (P<0.001), total flexor work (P<0.001), and ratio Flexor strength to Extensor (P<0.001).
Conclusions:Our results demonstrated that peak extensor power in 60 degrees/s reduced after fatigue. Reduction of peak extensor power could be a possible reason of reduction of performance in the final parts of the competition.   

کلیدواژه‌ها [English]

  • Kinetics
  • Knee kinematics
  • Local fatigue
  • Quadriceps Muscles
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