تاثیر دو شیوه‌ی متفاوت تمرین مقاومتی بر سختی شریانی در مردان جوان کم‌تحرک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری فیزیولوژی ورزشی،گروه تربیت بدنی و علوم ورزش، دانشکده علوم انسانی، دانشگاه تربیت مدرس، تهران، ایران

2 استاد فیزیولوژی ورزشی، گروه تربیت بدنی و علوم ورزشی، دانشکده علوم انسانی، دانشگاه تربیت مدرس، تهران، ایران

3 استاد اپیدمیولوژی دانشکده علوم پزشکی، دانشگاه علوم پزشکی ارتش، تهران، ایران

چکیده

مقدمه و هدف: برخی مطالعات نشان داده­اند که تمرینات مقاومتی به ویژه زمانی که میزان بار تمرینی در آنها زیاد باشد، می­توانند باعث افزایش سختی شریان­های مرکزی شوند. با این حال اثر پروتکل­های تمرینی مختلف بر این شاخص هنوز کامل روشن نیست. هدف از این مطالعه بررسی تاثیر دو شیوه­ی تمرین مقاومتی بر سختی شریانی در مردان جوان کم­تحرک بود.
مواد و روش­ها: آزمودنی­های (سن 2/5±4/26 سال، قد 05/0±78/1 متر، وزن 4/6±2/79 کیلوگرم، شاخص توده بدنی 5/1±9/24 کیلوگرم بر متر مربع) شرکت­کننده در این تحقیق به طور تصادفی به سه گروهِ تمرین مقاومتی با بار کم (50-30 درصد یک تکرار بیشینه، 3±25 تکرار در هر ست، 14 نفر) تا ناتوانی در ادامه هر ست (LLLF)، تمرین مقاومتی با بار زیاد (85-65 درصد یک تکرار بیشینه، 3±10 تکرار در هر ست، 13 نفر) تا ناتوانی در ادامه هر ست (HLLF)، و گروه کنترل (13 نفر) تقسیم شدند. آزمودنی­های گروه­های تمرینی هر جلسه تمرین مقاومتی که شامل اجرای 2 ست از 7 حرکت بود را 3 روز در هفته به مدت 10 هفته انجام دادند. آزمودنی­های گروه کنترل در این مدت هیچ فعالیت ورزشی منظمی نداشتند. ارزیابی­ متغیرهای مورد نظر در دو مرحله قبل و بعد از 10 هفته صورت گرفت.
یافته­ ها:سختی شریان­های مرکزی بعد از 10 هفته تمرین در گروه HLLF افزایش معنادار داشت (007/0P=)، با این وجود در گروه LLLF (12/0P=) و گروه کنترل (177/0P=) تغییر معناداری در این متغیر مشاهده نشد. به علاوه، مقایسه­های بین­گروهی نشان داد که تغییرات سختی شریانی مرکزی در گروه HLLF در مقایسه با گروه LLLF (001/0P=) و گروه کنترل (001/0P=) افزایش معنادار داشته است.
نتیجه­ گیری:در حالی که تمرینات HLLF باعث افزایش سختی شریان­های مرکزی مردان جوان می­شود، تمرینات LLLF چنین اثر ناخواسته­ای را در پی ندارند.
 

تازه های تحقیق

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کلیدواژه‌ها


عنوان مقاله [English]

Effects of Two Different Types of Resistance Training on Arterial Stiffness in Young Men.

نویسندگان [English]

  • Mohammad Hossein Nazari 1
  • Reza Gharakhanlou 2
  • Alireza Khoshdel 3
1 Department of Physical Education and Sports Science, University of Tarbiat Modares, Tehran, Iran
2 Department of Physical Education and Sports Science, University of Tarbiat Modares, Tehran, Iran
3 School of Medicine, AJA University of Medical Sciences, Tehran, Iran
چکیده [English]

Background and Purpose: It has been suggested that resistance training (RT), especially when using high loads, increases central arterial stiffness. The aim of this study was to investigate the effects of low- versus high-load RT on arterial stiffness in young healthy men.
Methods: Participants (mean age 26.4±5.2 yrs; mean height 1.78±0.05 m; mean weight 79.2±6.4 kg; mean body mass index 24.9±1.5 kg/m2) were randomly assigned to a low-load RT where 25±3 repetitions to lifting failure were performed per set of exercise (LLLF, n =14), a high-load RT where 10±3 repetitions to lifting failure were performed per set of exercise (HLLF, n =13), or a control group who maintained their regular activity habits (Ctrl, n =13). Subjects in LLLF and HLLF groups performed RT three times a week for 10 weeks.
Results: Central arterial stiffness significantly increased in HLLF group after training (P=0/007), but no such changes were observed in the LLLF (P=0/12) or the Ctrl (P=0/177) group. In addition, analyses of covariance revealed significant mean difference between HLLF and LLLF (P=0/001) groups and between HLLF and Ctrl (P=0/001) groups in central arterial stiffness.
Conclusions: These results suggest that, unlike the HLLF training protocol, LLLF protocol does not unfavorably affect central arterial stiffness in young men.

کلیدواژه‌ها [English]

  • Resistance Training
  • Arterial Stiffness
  • Pulse Wave Velocity
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