مقایسۀ واکنش اندوتلیالی و عصبی سمپاتیکی شریان بازویی وزنه‌برداران نخبه با گروه کنترل همسن کم‌تحرک

نوع مقاله: مقاله پژوهشی

نویسندگان

1 1.استادیار، گروه تربیت بدنی و علوم ورزشی، دانشکدۀ علوم انسانی، واحد اردبیل، دانشگاه آزاد اسلامی، اردبیل، ایران

2 2.دانشیار، گروه تربیت بدنی و علوم ورزشی، دانشکدۀ علوم تربیتی و روان‌شناسی، دانشگاه محقق اردبیلی، اردبیل، ایران

3 .استادیار، گروه تربیت بدنی و علوم ورزشی، دانشکدۀ علوم تربیتی و روان‌شناسی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

هدف مطالعۀ حاضر مقایسۀ پاسخ‌های اندوتلیالی و عصبی سمپاتیکی شریان بازویی به محرک‌های اتساع و انقباض عروقی در وزنه‌برداران نخبه و گروه کنترل همسن کم‌تحرک است. هفت وزنه‌بردار نخبه (سن 2/2±5/23سال) و هشت آزمودنی سالم کم‌تحرک (سن 12/2±3/24 سال)  داوطلبانه در این پژوهش شرکت کردند. برای تعیین اندازه‌های شریان بازویی در حالت استراحت، پس از 5 دقیقه انسداد بازو (اتساع عروقی وابسته به جریان) و طی تحریک سمپاتیکی حاد (تست فشار سرما) از اولتراسوگرافی داپلر وضوح بالا استفاده شد. پاسخ‌های واکنش عروقی به‌ترتیب از اوج تغییرات اتساعی و انقباضی اندازۀ مجرای شریانی محاسبه شد و با استفاده از آزمون‌های آماری t مستقل و اندازه‌گیری مکرر در سطح معنا‌داری 05/0 ≥P تجزیه‌وتحلیل شد. اندازۀ مجرای شریان بازویی وزنه‌برداران به‌ترتیب در هر سه حالت پایه [میانگین تفاوت‌ها 5/0 میلی‌متر (001/0=P)]، اوج اتساع [میانگین تفاوت‌ها 57/0 میلی‌متر (002/0=P)] و اوج انقباض [میانگین تفاوت‌ها 498/0 میلی‌متر (003/0=P)] به‌طور معنا‌داری نسبت به گروه کنترل بزرگ‌تر بود. هرچند تفاوت معنا‌داری بین شاخص‌های اتساع عروقی وابسته جریان، انقباض شریانی وابسته به تون سمپاتیکی و دامنۀ عملیات فیزیولوژیک شریان بازویی وزنه‌برداران و گروه کنترل همسن مشاهده نشد (05/0 ≥P). نتایج مطالعۀ حاضر نشان داد که واکنش عملکردی شریان بازویی لزوماً در وزنه‌برداران نخبه افزایش نمی‌یابد. هرچند، وزنه‌برداران نخبه از اندازۀ مجرای شریان بازویی بزرگ‌تری در مقایسه با گروه کنترل همسن سالم برخوردارند.

کلیدواژه‌ها


عنوان مقاله [English]

A Comparison of Sympathetic Neural and Endothelial Vasoreactivity of Brachial Artery in Elite Weightlifters with a Sedentary Age-Matched Control Group

نویسندگان [English]

  • Mehdi Khorshidi 1
  • lotfali Bolboli 2
  • salim Vahedi namin 3
1 Assistant Professor, Department of Physical Education and Sport Sciences, Faculty of Humanities, Ardabil Branch, Islamic Azad University, Ardabil, Iran
2 Associate Professor, Department of Physical Education and Sport Sciences, Faculty of Education Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran
3 Assistant Professor, Department of Physical Education and Sport Sciences, Faculty of Education Sciences and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده [English]

The aim of the present study was to compare the sympathetic neural and endothelial responses of brachial artery to vasodilatory and constrictor stimuli in elite weightlifters and a sedentary age-matched control group. 7 elite weightlifters (age 23.5±2.2 yrs) and 8 sedentary healthy subjects (age 24.3±2.12 yrs) voluntarily participated in this study. High-resolution Doppler ultrasound was used to determine brachial artery diameters at rest, following 5 minutes of forearm occlusion [Flow Mediated Dilation (FMD)] and during acute sympathetic stimulation [cold pressure test (CPT)]. Vasoreactivity responses were calculated from the vasodilatory and constrictor peak changes in artery diameter. The acquired data were analyzed using independent t test and repeated measures method at P≤0.05. Brachial artery diameters in baseline [mean differences, 0.5 mm (P=0.001)], peak vasodilation [mean differences, 0.57 mm (P=0.002)] and peak constriction [mean differences, 0.498 mm (P=0.003)] were significantly greater in weightlifters than control group. However, no significant difference was observed in %FMD, %CPT and vascular operating range (VOR) between weightlifters and age-matched control group (P≤0.05). The present study indicated that the function of brachial artery is not necessarily enhanced in elite weightlifters. However, elite weightlifters had larger brachial artery diameter than age-matched healthy control subjects.

کلیدواژه‌ها [English]

  • Brachial artery
  • elite weightlifters
  • endothelial function
  • vasoreactivity
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