مقایسه شاخص های دامنه واکنش عروقی شریان براکیال در ورزشکاران نخبه با افراد غیر ورزشکار

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد یار گروه تربیت بدنی و علوم ورزشی، دانشکده علوم انسانی، دانشگاه آزاد اسلامی، واحد اردبیل، اردبیل، ایران

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

چکیده

مقدمه و هدف: شاخص های دامنه واکنش عروقی می توانند اطلاعات مهمی درباره چگونگی توزیع جریان خون بدن در طی افزایش استرس های متابولیک فراهم آورند.هدف از مطالعه حاضر مقایسه شاخص های دامنه واکنش عروقی شریان براکیال در ورزشکاران نخبه با افراد غیر ورزشکار می باشد.
مواد و روش­ها: هفت وزنه بردار نخبه، هفت قایقران استقامتی و هشت آزمودنی سالم غیرورزشکار به طور داوطلبانه در این پژوهش شرکت کردند. برای تعیین اندازه های شریان براکیال در حالت استراحت، پس از 5 دقیقه انسداد بازو و در طی تحریک سمپاتیکی حاد از اولتراسونوگرافی با وضوح بالا استفاده شد. پاسخ های اتساع و انقباض عروقی به ترتیب از اوج تغییرات اتساعی و انقباضی اندازه مجرای شریانی محاسبه شد. تفاوت های متغیرهای مورد اندازه گیری در گروه های آزمون، و با استفاده از آزمون آماری آنالیز واریانس مورد تجزیه تحلیل قرار گرفت.سطح معنی داری  05/0 ≥P در نظر گرفته شد.
یافته­ها: اندازه مجرای شریان براکیال قایقرانان و وزنه برداران در هر سه حالت پایه ، اوج اتساع و اوج انقباض نسبت به گروه کنترل بزرگتر  بود. هرچند، تفاوت معنی داری بین شاخص های اتساع عروقی وابسته جریان، انقباض شریانی وابسته به تون سمپاتیکی و دامنه عملیات فیزیولوژیک شریان براکیال در سه گروه قایقران، وزنه بردار و کنترل مشاهده نشد.
نتیجه­گیری:این یافته ها با حمایت از فرضیه پارادوکس شریان ورزشکار، نشان می دهند که شاخص های دامنه واکنش عروقی شریان براکیال، تحت تاثیر تمرینات ورزشی مزمن استقامتی و توانی قرار نمی گیرند و عملکرد شریانی ورزشکاران نخبه طبیعی است. هرچند، ورزشکاران نخبه از اندازه مجرای شریان براکیال بزرگتری در حالت استراحت و در پاسخ به محرک های اتساعی و انقباضی عروق  نسبت به افراد غیر ورزشکار برخوردارند.

تازه های تحقیق

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کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Brachial Artery Vasoreactivity Range Indices in Elite Athletes with Non-athlete Subjects

نویسندگان [English]

  • Mahdi khorshidi Hosseini 1
  • Lotfali Bolboli 2
1 Department of Exercise Physiology, Isalamic Azad University, Ardabili Branch, Ardabil, Iran
2 Faculty of Education and Psychology, Mohaghegh Ardabali University, Ardabil, Iran
چکیده [English]

Background & Purpose: Vasoreactivity range indices may provide important information about the manner in which blood flow is distributed within the body during times of increased metabolic stress. The aim of present study was to compare the brachial artery vasoreactivity range indices in elite athletes and non-athlete subjects.
Methodology: Seven elite weightlifters, 7 elite rowers, and 8 untrained healthy subjects voluntarily participated in this study. High-resolution ultrasound was used to determine brachial artery diameters at rest following 5 minutes of forearm occlusion and during acute sympathetic stimulation. Vasodilatory responses were calculated from the peak change in artery diameter, and vasoconstrictor responses were determined from the nadir values in response to stimuli, respectively. Differences in measured variables among the groups were analyzed using analysis of variance (ANOVA). A p-value <0.05 was considered statistically significant.
Results: Baseline, peak and nadir values brachial artery diameters were significantly greater in weightlifters and rowers than control group. Despite no significant difference was observed in FMD%, CPT% and Vascular operating range (VOR) weightlifters, rowers and non-athlete subjects (P < 0.05).
Conclusion: These results provide support the ‘athlete paradox hypotheses’ and suggest that chronic power and endurance exercise training don’t affect brachial artery vasoreactivity range indices and elite athletes possess functionally ‘normal’ arteries. However, elite athletes possess larger conduit brachial artery diameter at rest and in response to vasodilator and vasoconstrictor stimuli than non-athlete subjects.

کلیدواژه‌ها [English]

  • Vasoreactivity
  • Elite Athletes
  • Brachial Artery
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