نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار بیومکانیک ورزشی، دانشگاه شهید بهشتی
2 استاد فیزیوتراپی، دانشگاه تربیت‌مدرس
3 استاد بیومکانیک ورزشی، دانشگاه بوعلی‌سینا
4 استاد فیزیولوژی ورزشی، دانشگاه بوعلی‌سینا
چکیده
هدفاینپژوهش،تعیینتأثیرویبراسیونبادامنةمختلفوفرکانسثابتبررویاستخوانران و درشت‌نیرتاوراکتومیبود. 23 سررتاوراکتومیدردوگروهتمرینی ویبراسیونبادامنةپایین (تعداد= نُه) ودامنةبالا (تعداد= نُه) وگروه شم(تعداد= پنج) تقسیمشدند.شش سر رتسالمبدونجراحینیزدرگروهکنترلجایگرفتند. گروه‌هایتمرینیبه‌مدت هشت هفتهرویدستگاهویبراسیونبازمانپیش‌روندة سه تا پنج دقیقه، تناوبدو تا هفت بار تکراروزماناستراحت یک دقیقهقرارداده شدند. شاخص‌هایمقاومتمکانیکی سفتی، استرس،انرژیجذب‌شدهودرصدجابه‌جاییاستخوانران و درشت‌نی،باآزمونخمشسه‌نقطه‌ایپسازاتمامپروتکلویبراسیونکلبدنارزیابیشدند.شاخصمکانیکیسختی استخوانبینگروهتمرینی دامنه بالا (HA)) 024/0(P= و گروه تمرینی دامنه پایین (LA) (006/0(P=درمقایسهباگروهشم در استخوان ران و درشت نیافزایشمعناداری رانشانداد. شاخصاسترسبینگروهتمرینیHA )000/0(P= و گروه تمرینی) LA 001/0(P=نسبت بهگروهشم، در استخوان درشت‌نیافزایشمعناداری رانشانداد. شاخص انرژی جذب‌شده فقط در گروه تمرینی) LA 006/0(P=باگروهشم در استخوان درشت نیافزایشمعناداری رانشانداد. افزایش معناداری بین گروه کنترل نسبت به گروه شم، در شاخص‌های ذکرشده نیز مشاهده شد )011/0P=، 000/0P=،014/0(P=. یافته‌هایاینپژوهشنشاندادکهویبراسیونبادامنةپاییناثر بیشتریبرافزایشمقاومتمکانیکیاستخوانداشتهاست؛ .همچنین، پاسخارتعاشاتمکانیکیبرپارامترهایمکانیکیاستخواندرشت‌نیبیشتربودهاست و ارتعاشات کل بدن توانسته است مقاومت مکانیکی استخوان را در شرایط اوراکتومی به سطح استخوان سالم نزدیک کند.
کلیدواژه‌ها
عنوان مقاله [English]
The Effect of Whole Body Vibration on the Mechanical Properties of the Femur and Tibia in Ovariectomized Rats
نویسندگان [English]
- Hoda Mozayani 1
- Giti Torkaman 2
- Mehrdad Anbarian 3
- Ali Heydarian-pour 4
1 Assistant Professor of Sport Biomechanics, Shahid Beheshti University
2 Professor of Physiotherapy, Tarbiat Modares University
3 Professor of Sport Biomechanics, Bu-Ali Sina University
4 Professor of Sport Physiology, Bu-Ali Sina University
چکیده [English]
The aim of this study was to determine the effect of whole-body vibration at a constant frequency and different amplitude in femur and tibia bones in ovariectomized rats. 23 ovariectomized rats divided into two exercise groups (n=9) and a SHAM group (n=5). Six healthy and non-surgical rats formed the control group. Rats in exercise and SHAM groups were placed on vibration platform for 8 weeks on the progressive time 2-5 minutes, 3-7 set and 1-minute inter-set rest time. Mechanical properties including stiffness, stress, and energy absorption and displacement percentage of the femoral and tibial were evaluated with three-point bending test after the period of the study. Stiffness index between training groups HA (P=0.024) and LA group (P=0.006) in femur and tibia compared with the sham group showed a significant increase. Stress index significantly increased between HA groups (P=0.000) and LA group (P=0.001) relative to the sham group in tibia. Energy absorb in just LA group (P=0.006) with the sham group showed a significant increase in tibia. Significantly increased control group compared to the sham was also observed in the indices (P=0.014, 0.000, 0.011) Our findings indicate a positive effect of whole-body vibration on the mechanical properties of the bone in both low and high amplitude conditions, but it was more effective in low-amplitude than high-amplitude condition. Also, whole-body vibration training is more effective to mechanical properties of tibia. Mechanical properties of bone in ovariectomized rats were close to control group level during whole body vibration.
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