تأثیر چهار هفته تمرین مقاومتی هایپوکسی بر هایپرتروفی و عملکرد عضلۀ دوسر بازویی مردان سالم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد تربیت بدنی و علوم ورزشی، دانشگاه شهید بهشتی، تهران، ایران

2 استادیار، گروه علوم زیستی در ورزش، دانشکدۀ تربیت بدنی و علوم تندرستی، دانشگاه شهید بهشتی، تهران، ایران

3 استاد، گروه علوم زیستی در ورزش، دانشکدۀ تربیت بدنی و علوم تندرستی، دانشگاه شهید بهشتی تهران، تهران، ایران

چکیده

افزایش ترشح عوامل رشدی و متابولیکی به‌وسیلۀ تمرینات هایپوکسی نشان داده شده، این در حالی است که عملکرد عضلانی به‌عنوان عامل اثرگذار اجرای ورزشی مورد توجه قرار نگرفته است. هدف از تحقیق حاضر بررسی تأثیر 4 هفته تمرین مقاومتی در شرایط هایپوکسی بر هایپرتروفی و عملکرد عضلۀ دوسر بازویی مردان سالم بود. 16 مرد جوان سالم به‌صورت تصادفی در دو گروه تمرین مقاومتی در شرایط هایپوکسی (فشار سهمی اکسیژن 13 درصد: 8 نفر) و نورموکسی (فشار سهمی اکسیژن 20 درصد: 8 نفر) قرار گرفتند. برنامۀ تمرینی برای هردو گروه به مدت 4هفته شامل 3 جلسه تمرین (60 درصد یک تکرار بیشینه تا واماندگی، سه سِت و یک دقیقه استراحت) حرکت جلوبازو ایستادۀ هالتر در هفته با 48 ساعت ریکاوری پس از تمرین انجام گرفت. قدرت به‌وسیلۀ یک تکرار بیشینه، هایپرتروفی با استفاده از معادلۀ بورش و عملکرد عضلانی به‌وسیلۀ دستگاه آیزوکینتیک قبل و بعد از 4 هفته تمرین ارزیابی شد. در مقایسۀ دو گروه با هم تفاوت‌های آماری معناداری برای قدرت و شاخص خستگی مشاهده شد (05/0≥P). ولی دیگر عوامل شامل درصد چربی دوسر بازویی، هایپرتروفی، گشتاور مفصل آرنج در انقباض درون‌گرا و برون‌گرا، کل کار انجام‌گرفتۀ عضلۀ دوسر بازویی در انقباض درون‌گرا و برون‌گرا، نسبت فعالیت عضلات موافق به مخالف تفاوت معناداری نداشتند (05/0≤P). به‌نظر می‌رسد 4هفته تمرین مقاومتی هایپوکسی با بهبود معنادار قدرت و شاخص خستگی همراه می‌شود و این در حالی است که هایپرتروفی و شاخص‌های عملکرد عضلانی با درنظر گرفتن حجم تمرین کمتر در شرایط هایپوکسی تغییرات مشابهی را نشان دادند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of 4 Weeks of Resistance Training in Hypoxic Conditions on Hypertrophy and Function of Biceps Muscle in Healthy Men

نویسندگان [English]

  • ali moghadasi 1
  • Mohamad fashi 2
  • sajad ahmadizad 3
1 MSc of Physical Education and Sport Sciences, Shahid Beheshti University, Tehran, Iran
2 Assistant Professor, Department of Biological Sciences in Sport, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran
3 Professor, Department of Biological Sciences in Sport, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran
چکیده [English]

Increased secretion of growth and metabolic factors by hypoxic exercise has been shown, while muscle function has not been considered as an effective factor in exercise performance. This study aimed to investigate the effect of 4 weeks of resistance training in hypoxic conditions on hypertrophy and function of biceps muscle in healthy men. 16 healthy young men were randomly assigned to two groups: hypoxic resistance training (PaO2=13%, n=8) and normoxic resistance training (PaO2=20%, n=8). The training program for both groups lasted 4 weeks including 3 sessions (60% of 1RM until exhaustion, 3 sets and 1 minute of rest) of standing curls biceps with 48 hours of recovery after the training per week. Strength was assessed by 1RM, hypertrophy by Buresh formula and muscle functions by the isokinetic system before and after 4 weeks of training. A comparison of the two groups showed statistically significant differences in strength and the fatigue index (P≤0.05). Other factors including biceps fat percentage, hypertrophy, elbow peak torque in concentric and eccentric contractions, total work of biceps in concentric and eccentric contractions and the ratio of agonist/antagonist muscle activity did not show significant differences (P≥0.05). It seems that 4 weeks of hypoxia resistance training is associated with a significant improvement in strength and fatigue index. However, hypertrophy and muscle function indices showed similar changes considering less training volume in hypoxia conditions.

کلیدواژه‌ها [English]

  • hypertrophy
  • hypoxic conditions
  • muscle function
  • resistance training
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