مقایسه طیف فرکانس نیروهای عکس العمل زمین طی دویدن در کودکان دارای عارضه سربه جلو و همسالان سالم

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 دانشجوی کارشناسی ارشد بیومکانیک ورزشی، دانشگاه محقق اردبیلی، اردبیل، ایران

3 دانشجوی کارشناسی ارشد فیزیولوژی ورزشی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

مقدمه و اهداف
آسیب­ های مرتبط با دویدن علت­ های مختلفی را دارا هستند. هدف از مطالعه حاضر، بررسی طیف فرکانس نیروهای عکس­العمل زمین در کودکان دارای عارضه سربه­جلو و همسالان سالم آن­ها طی فاز استقرار دویدن می­باشد.
مواد و روش­ ها
28 کودک پسر به ترتیب در دو گروه سالم (تعداد=16 نفر) و سربه­جلو (تعداد=12 نفر) قرار گرفتند. دو سیستم صفحه نیرو کیستلر (نرخ نمونه­برداری: 1000 هرتز) جهت ثبت نیروهای عکس­العمل زمین طی دویدن با پای برهنه استفاده شد. از آزمون آماری t مستقل جهت تحلیل آماری استفاده شد. سطح معناداری برابر 05/0 بود.
یافته ­ها
نتایج مطالعه حاضر نشان داد که سرعت دویدن در کودکان دارای عارضه سربه­جلو در مقایسه با گروه کنترل کمتر می­باشد (001/0>P). تعداد هارمونی­های لازم برای رسیدن به 95 درصد انرژی سیگنال در مولفه­ی نیروی عکس­العمل زمین در پای غالب در گروه سالم نسبت به گروه سربه­جلو بزرگتر بود (001/0=P؛ اندازه اثر متوسط). محتوای فرکانس با توان 5/99 درصد تعداد هارمونی­ های ضروری مولفه­ی گشتاور آزاد در پای غالب در گروه سربه­جلو بیشتر بود (005/0=P؛ اندازه اثر بزرگ). سایر مولفه­های طیف فرکانس نیروی عکس­العمل زمین طی دویدن تفاوت معناداری را بین دو گروه نشان نداد (05/0<P).
نتیجه­ گیری
با توجه به پایین بودن سرعت دویدن در کودکان دارای عارضه­ی سربه­جلو، میزان فرکانس پایین نشان­دهنده نوسان کمتر مرکز ثقل می­باشد. این تغییر سرعت و فرکانس پایین هنگام دویدن، نشان­دهنده کاهش کارایی مکانیکی کودکان دارای عارضه سربه­جلو است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Comparison of Frequency Spectrum of Running Ground Reaction Forces in Children with Forward Head Posture and Healthy Controls

نویسندگان [English]

  • Amiali Jaafarnejad 1
  • Hamed Sheikhalizade 2
  • Milad Alipour Sari-Nasirloo 3
1 Assistant Professor of Sport Management, Department of Physical Education and Sport Sciences, Faculty of Educational Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran
2 MSc Student of Sport Biomechanics, Department of Physical Education and Sport Sciences, Faculty of Education Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran
3 MSc Student of Sport Physiology, Department of Physical Education and Sport Sciences, Faculty of Education Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

Background and Aims: Running related injuries have different causes. The objective of the present study was to investigate the frequency spectrum of ground reaction forces during stance phase of running in children with forward head posture and healthy controls.
Materials and Methods: A total of 28 male children were divided into two groups of healthy controls (n=16) and forward head posture (n=12). Two Kistler force platforms (sampling rate: 1000 Hz) were used to record the ground reaction forces during barefoot running. Independent sample t-test was used for statistical analysis. The significance level was set at 0.05.
Results: Findings indicated that running speed in children with forward head was lower than that in the control group (P<0.001). The number of essential harmonics to reach 95% of total energy of the vertical ground reaction force signal in dominant limb in the healthy group was greater than that of forward head group (medium effect size; P=0.001). The frequency content with 99.5% power of the number of essential harmonics of free moment in the forward head group was greater than that of the control group (large effect size; P=0.005). Other components of running ground reaction force frequency content were not statistically different between the two groups (P> 0.05).
Conclusion: Due to lower walking speed in children with forward head posture, lower frequency content indicated lower center of gravity sway. Also, these lower walking velocity and frequency content demonstrated lower mechanical efficiency in children with forward head posture.

کلیدواژه‌ها [English]

  • Forward head؛ Running
  • Ground reaction force؛ Frequency content
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دوره 9، شماره 1
فروردین 1399
صفحه 37-48
  • تاریخ دریافت: 18 دی 1397
  • تاریخ بازنگری: 05 خرداد 1398
  • تاریخ پذیرش: 20 خرداد 1398
  • تاریخ اولین انتشار: 01 فروردین 1399