نویسندگان
دانشگاه شهرکرد
چکیده
هدف: فعالیت بدنی از طریق کشش‌های ناشی از انقباضات عضلانی، بار مکانیکی را بر استخوان اعمال کرده و با تحریک استخوان، متغیّرهای ساختاری مانند: قدرت و تراکم استخوان را افزایش می‌دهد. این پژوهش به منظور بررسی مقایسه شدتهای مختلف تمرین استقامتی بر متغیرهای منتخب بیومکانیکی استخوان ران در رتهای سالمند نژاد ویستار اجرا شد.
روشها: در این پژوهش تجربی، 24 سر موش صحرایی نر نژاد ویستار مسن (23 ماه) با میانگین وزنی 75/441 گرم به صورت تصادفی بر اساس وزن اولیه در دو گروه تمرینی و یک گروه کنترل شامل گروه تمرین استقامتی با شدت متوسط (n=8)، تمرین استقامتی با شدت بالا (n=8) و گروه کنترل (n=8) قرار گرفتند. تمرین استقامتی با شدت متوسط با70%-60% و شدید 110%-80% سرعت بیشینه، پنج روز در هفته به مدت هشت هفته بود، که مدت و مسافت (حجم تمرین) هر جلسه فعالیت در هر دو گروه برابر اما شدت تمرین متفاوت بود. 48 ساعت پس از آخرین جلسه تمرینی حیوانات برای انجام جراحی و استخراج بافت استخوانی فمور بیهوش و سپس تشریح شدند. از آزمون فشار مکانیکی خمش سه نقطهای برای تعیین تغییرات بر مدولاسیون، حداکثر مقاومت و انرژی شکست و نیروی استخوان ران رتهای نر استفاده شد. تجزیه تحلیل آماری با استفاده از آزمون آنالیز واریانس یکطرفه با سطح 05/ 0≥P < /span> انجام شد.
یافتهها: نتایج نشان داد که این نوع تمرینات تأثیری بر مدولاسیون (198/0p=)، قدرت استخوان (24/0p=)، انرژی شکست (204/0p=)،تغییرشکل تا نقطه ی حداکثر استحکام (89/0p=) و نیروی استخوان ران (31/0p=) موش صحرایی نر نداشت و بین گروه ها تفاوت معنیداری در این فاکتورها وجود نداشت.)بهتر است چند یافته مهم را با ذکر P دقیق valueگزارش کنید.)
نتیجه گیری: به نظر میرسد تغییرات بیومکانیکی استخوان پس از انجام چنین تمریناتی نیاز به دورههای طولانیتر تمرین ورزشی دارد که باید در تحقیقات آینده مورد بررسی قرار بگیرد.
کلیدواژه‌ها
عنوان مقاله [English]
The Effect of Eight Weeks of Moderate and High Intensity Endurance Training On Biomechanical Properties of Femur in Old Male Wistar Rats
نویسندگان [English]
- zahra hemati farsani
- ebrahim banitalebi
- Mohamad Faramarzi
- Amin Bigham-Sadegh
چکیده [English]
Background: Physical activity reduces the risk of bone fractures by decelerating the bone loss and enhancing muscle strength. Such activities promote the bone strength and bone density through bone stimulation. The present study aimed to compare the effect of endurance training with varying intensities on the selected biomechanical properties of femurs in old male Wistar rats.
Methods: 24 male Wistar rats (23 months old) with an average weight of 441.75 grams were randomly divided into 2 experimental and one control grpups: Moderate intensity continuous training (MICT, n = 8), high intensity Interval training (HIIT, n = 8), and control group (CG, n = 8). Moderate and high intensity endurance training sessions were held five days a week with 60-70% and 80-110% of the maximum speed) and high (maximum speed) for eight weeks, respectively. In the MICT and HIET groups, the duration and distance (volume of training) were the same and only the intensity of training differed. Forty-eight hours after the last training session, the rats underwent surgery and their femur removed. Three–point bending flexural test was used to determine the effects of training on modulation, maximum endurance, fracture energy, and femur strength in the rats. The statistical analysis was performed using one-way ANOVA test at P <0.05.
Results: The study results indicated that eight weeks of endurance training with varying intensities had no significant effect on modulation (p < /em>=0.198), bone strength (p < /em>=0.24), fracture energy (p < /em>=0.204), deformation-to-maximum strength (p < /em>=0.89), and femur strength (p < /em>=0.31), and that no significant difference was observed among the three groups.
Conclusion: The biomechanical changes of the bone by such exercises require longer periods of training, which could be examined in future studies.
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- Keyword: Aging
- Exercise
- Bone
- Biomechanical properties
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دکتر زهرا همتی فارسانی و همکاران دوره شانزدهم، شماره 2 (شماره مسلسل 61)، بهار 1397، صفحه‌های
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