نوع مقاله : مقاله پژوهشی Released under CC BY-NC 4.0 license I Open Access I

نویسندگان

1 دانشجوی دکتری، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه تهران، تهران، ایران

2 دانشیار، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران

3 دانشجوی دکتری، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران

چکیده

 
هدف از پژوهش حاضر تعیین تأثیر پیش­سرمایش بر متغیر­های فیزیولوژیکی، عملکردی و ادراکی مردان در یک فعالیت شدید وامانده­ساز در محیط گرم بود. آزمودنی­ها 10 مرد سالم ورزشکار (میانگین سن 89/1±40/23 سال، وزن 94/8±80/69 کیلوگرم، قد 98/5±172 سانتی­متر، چربی بدن 39/3±93/10 درصد) بودند. آزمودنی­ها در یک جلسۀ مجزا در آزمایشگاه حاضر شدند و vVO2maxآنها تعیین شد و سپس به دو گروه تقسیم شدند. فعالیت ورزشی در یک اتاقک گرمایی با دمای 38 درجۀ سانتی­گراد و رطوبت نسبی 50 درصد انجام گرفت. یک گروه پیش از فعالیت به مدت 30 دقیقه جلیقۀ یخ را می‌پوشیدند و در محیط گرم قرار می­گرفتند و پس از گرم کردن با سرعت 50 درصد vVO2max، سرعت نوار گردان به حد vVO2maxافزایش می­یافت و تا واماندگی ادامه پیدا می­کرد. متغیرهای ضربان قلب، دمای مرکزی بدن، مقدار لاکتات خون، و متغیرهای ادراکی و Tmax اندازه­گیری شد. برای تجزیه‌وتحلیل داده‌ها از آزمون­های t وابسته، بونفرونی و تحلیل واریانس مکرر در سطح معناداری (05/0P =) استفاده شد. نتایج نشان داد پوشیدن جلیقۀ یخ بر Tmax (005/0P =)، شاخص درک فشار (029/0P =) و شاخص درک گرما (001/0P =) تأثیر معنادار داشت و عملکرد را 27 درصد افزایش داد. اما بر دمای مرکزی بدن (194/0P =)، لاکتات خون (051/0P =) و تعداد تواتر قلبی (00/1P =) تأثیر معناداری نداشت. به‌طور کلی نتایج نشان داد که پیش‌سرمایش بر عملکرد و متغیرهای ادراکی تأثیر دارد و بر متغیرهای فیزیولوژیکی تأثیر معناداری ندارد.

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Pre-Cooling on Physiological, Functional and Perceptual Variables in Men in an Exhaustive Intense Activity in a Warm Environment

نویسندگان [English]

  • Zahra Shahsavari 1
  • Mohammadreza Dehkhoda 2
  • Hamid Rajabi 2
  • Seyed Mohammad Seyedi Bidgoli 3

1 a

2 Associate Professor, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran

3 PhD Student, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran

چکیده [English]

 
The aim of this study was to determine the effect of pre-cooling on physiological, functional and perceptual variables in men in an exhaustive intense activity in a warm environment. 10 healthy athlete men (mean age 23.40±1.89 yr, weight 69.80±8.94 kg, height 172±5.98 cm, body fat percentage 10.93±3.39) participated in a separate session in the laboratory; their vVO2max was determined and then they were divided into two groups. They exercised in a heated chamber at 38˚c and 50% humidity. A group wore an ice-vest before activity for 30 minutes in a warm place. After warm-up (speed: 50% vVO2max), the speed of the treadmill increased to vVO2max and continued until exhaustion. Heart rate, core body temperature, blood lactate, perceptual variables and Tmax were measured. To analyze the data, dependent t test, Bonferroni test and ANOVA with repeated measures were used (P=0.005). The results indicated that ice-vest had a significant effect on Tmax (P=0.005), RPE (P=0.029) and TSS (P=0.001) and improve performance by 27%.    But it had no significant effect on core body temperature (P=0.194), blood lactate (P=0.051) and HR (P=1.00). Overall, the results showed that pre-cooling had an effect on functional and perceptual variables but no significant effects on physiological variables.

کلیدواژه‌ها [English]

  • exhaustive intense activity
  • functional variables
  • men
  • perceptual variables
  • physiological variables
  • pre-cooling
  • warm environment
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