نوع مقاله : مقاله پژوهشی Released under (CC BY-NC) license I Open Access I
نویسندگان
1 دانشجوی دکتری فیزیولوژی ورزشی، گروه تربیت بدنی و علوم ورزشی، واحد بروجرد، دانشگاه آزاد اسلامی، بروجرد، ایران.
2 گروه تربیت بدنی و علوم ورزشی، دانشکده علوم انسانی، دانشگاه آیت الله بروجردی، بروجرد، ایران.
3 گروه علوم ورزشی، دانشکده علوم انسانی، دانشگاه رازی، کرمانشاه، ایران.
چکیده
زمینه و هدف:
دمای محیط و نوع تمرین از عوامل مؤثر در غلظت لپتین و وضعیت متابولیک هستند. هدف این مطالعه، بررسی تأثیر شش هفته تمرینات تناوبی با شدت بالا (HIIT) در دمای سرد بر شاخص مقاومت انسولینی و سطوح سرمی لپتین در مردان چاق بود.
روش پژوهش:
نمونه آماری شامل ۳۲ مرد جوان چاق (سن: ۲۲/۲±۲/۹ سال، شاخص توده بدن: ۳۱/۴±۱) بود که بهطور تصادفی به چهار گروه تقسیم شدند: TR22 (تمرین در ۲۲ درجه)، TR10 (تمرین در ۱۰ درجه)، C22 (استراحت در ۲۲ درجه) و C10 (استراحت در ۱۰ درجه). گروههای TR22 و TR10 طی شش هفته، سه جلسه در هفته، تمرینات HIIT شامل ۸ تا ۱۰ وهله دویدن ۱ دقیقهای با شدت ۸۵–۹۵٪ حداکثر ضربان قلب ذخیره، همراه با ۱ دقیقه استراحت فعال با شدت ۶۰–۷۰٪ روی تردمیل انجام دادند. سطوح لپتین، انسولین، گلوکز، شاخصهای آنتروپومتریک و HOMA-IR پیش و پس از مداخله اندازهگیری شد.
یافتهها:
در گروه TR10، پس از شش هفته تمرین در سرما، مقادیر لپتین (P=0.04)، انسولین (P=0.039)، گلوکز (P=0.034)، وزن (P=0.042) و درصد چربی (P=0.016) کاهش معنیداری یافت. این تغییرات در سایر گروهها، از جمله TR22، مشاهده نشد. همچنین در TR10، بین کاهش درصد چربی و سطوح لپتین (P=0.031) و انسولین (P=0.039) ارتباط معناداری دیده شد. تغییری در HOMA-IR مشاهده نشد.
نتیجهگیری:
تمرینات HIIT در هوای سرد نسبت به دمای معمول تأثیر بیشتری در کاهش لپتین دارد. همچنین HIIT هر دو دما تأثیر معنیداری بر HOMA-IR نداشت. کاهش لپتین و انسولین با کاهش درصد چربی مرتبط است.
کلیدواژهها
موضوعات
عنوان مقاله [English]
The Effect of Six Weeks of High-Intensity Interval Training in Cold Temperature on Insulin Resistance Index and Serum Leptin in Obese Men
نویسندگان [English]
- Ahmad Shahsavari 1
- Amir Khosravi 2
- Naser Behpoor 3
1 Ph. D student, Department of Exercise Physiology, Bo.c. , Islamic Azad University, Borujerd, Iran.
2 Department of Physical Education and Sports, Faculty of Humanities, Ayatollah Borujerdi University, Borujerd, Iran.
3 Department of Sport Sciences, Faculty of Humanities, Razi university, Kermanshah, Iran.
چکیده [English]
Introduction:
Ambient temperature and exercise type influence leptin concentration and metabolic status. This study aimed to investigate the effect of six weeks of high-intensity interval training (HIIT) in cold temperature on insulin resistance index and serum leptin levels in obese men.
Methods:
The sample included 32 young obese men (age: 22.2 ± 2.9 years; BMI: 31.4 ± 1), randomly divided into four groups: TR22 (training at 22°C), TR10 (training at 10°C), C22 (rest at 22°C), and C10 (rest at 10°C). TR22 and TR10 groups performed HIIT on a treadmill for six weeks, three sessions per week, consisting of 8–10 intervals of 1-minute running at 85–95% of heart rate reserve, with 1-minute active rest at 60–70%. Leptin, insulin, glucose, anthropometric indices, and HOMA-IR were measured before and after the intervention.
Results:
In the TR10 group, after six weeks of training in cold, significant decreases were observed in leptin (P=0.04), insulin (P=0.039), glucose (P=0.034), weight (P=0.042), and body fat percentage (P=0.016). These changes were not observed in other groups, including TR22. Additionally, in TR10, a significant correlation was found between reductions in body fat percentage and leptin (P=0.031) and insulin (P=0.039). No changes in HOMA-IR were detected.
Conclusion:
HIIT in cold air has a greater effect on reducing leptin compared to normal temperature. HIIT at both temperatures had no significant impact on HOMA-IR. Reductions in leptin and insulin were associated with decreased body fat percentage
کلیدواژهها [English]
- Interval Exercise
- Insulin Resistance
- Cold Temperature. Leptin
- Obesity
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