نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد بیومکانیک ورزش، دانشگاه اصفهان

2 استادیار گروه آسیب شناسی ورزشی، دانشگاه اصفهان

3 استاد گروه رفتار حرکتی، دانشگاه اصفهان

چکیده

هدف ازانجام پژوهش حاضر، مقایسه و تعیین‌ ارتباط متغیرهای سینماتیکی ‌مرحلة تیک‌آفدراجراهای موفق و ناموفق اسپکپشتخطوالیبال می‌باشد. بدین‌منظور، ‌73 مورد اجرای صحیح اسپک پشت خط اجراشده توسط هفت بازیکن نخبۀ جوان مورد‌بررسی قرار گرفت. تصویربرداری دو بعدی از تمام اجراها انجام و متغیرهای سینماتیکی مطلوب محاسبه گردید. نتایج نشان می‌دهد که بین سه متغیر نمرة مهارت در اجرا، زاویة تیک‌آف و سرعت افقی توپ در اجراهای موفق و ناموفق، به‌لحاظ آماری تفاوت معناداری وجود دارد؛ در‌حالی که تفاوت سه متغیر زمان حمایت، سرعت برآیند تیک‌آف و ارتفاع پرش در اجراهای موفق و ناموفق، به‌لحاظ آماری معنادار نمی‌باشد. همچنین، نتایج بیانگر این است که‌ بین ارتفاع پرش با سرعت و زاویة تیک‌آف رابطه وجود دارد؛ بنابراین، پیشنهاد می‌شود نسبت سرعت‌های افقی و عمودی تیک‌آف برای کسب موفقیت در اجرا مورد‌توجه قرار گیرد.

کلیدواژه‌ها

عنوان مقاله [English]

Kinematic Parameters of Take-Off Phase in Volleyball Back Row Spike

نویسندگان [English]

  • Reza Naderpour 1
  • Shahram Lenjannejadian 2
  • Ahmadreza Movahedi 3

1 MSc in Sport Biomechanics, University of Isfahan

2 Assistant Professor, Department of Sport Injuries, University of Isfahan

3 Professor, Department of Motor Behavior, University of Isfahan

چکیده [English]

The purpose of this study was to compare and to determine the relationship between biomechanical parameters of take off in successful and unsuccessful volleyball back row spikes. Seventy three correct back row spikes performed by seven elite young volleyball players were investigated in this research. Two dimensional video recordings were done during all performances and the desired kinematic parameters were computed. The results demonstrate significant differences in skill score, horizontal velocity of ball, and angle of take off between successfull and unsuccessfull performances while, differences between support time, resultant velocity at take off and height of jump were not significant between successfull and unsuccessfull spikes. The correlation anlysis also show a relationship between heigth of jump and both velocity and angle of take off. Therefore, it is suggested that the ratio of the horizontal and vertical take-off speeds to be considered for successful back row spikes.

کلیدواژه‌ها [English]

  • Kinematics
  • Volleyball Back Row Spike
  • Take off
  • Correlation
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