عنوان

تأثیر هشت هفته تمرینات استقامتی، مقاومتی و ترکیبی بر تغییرات آیریزین، برخی شاخص های گلایسمیک و نسبت چربی احشایی به توده عضلات بدن زنان چاق غیر فعال

Text of Note

BACKGROUND Physical exercise is a requirement of today's machine life. Fat accumulation is one of the consequences of machine life, but researchers have recently discovered that Irisin can convert white adipose tissue to brown adipose tissue and increase metabolic rate and caloric cost, and is vary in individuals with different body mass index and metabolic characteristics. The aim of this study is to determine the effect of eight weeks of endurance, resistance and concurrent training on irisin changes, some glycemic indexes and viscera fat to muscle mass ratio on sedentary obese women. METHODS In this study, 33 obese women with a body mass index above 30 Kg.m-2 divided in to three groups: endurance (Age 40 3 years and Weight 81.62 9.5 kg), resistance (Age 37 4 years and Weight 82.94 10.4 kg) and concurrent training (Age 37 4 years and Weight 85.44 11.01 kg). Training was applied in eight progressive weeks. In general as running on a treadmill at 50 to 70 of VO2max and working with resistance machines by 60 to 80 percent of 1RM for 40 to 45 minutes, 3 sessions a week. The concurrent team performed in a mid-term meeting. At first and the end of study, blood sampling and physical composition were measured. Analyses was done by Shapiro-Wilk test and two-way repeated measure ANOVA (<0.05). RESULTS No significant difference was found between the groups in the irisin variable (P <0.05). But the results of each group showed a significant difference in their pre- post (endurance group P = 0.004, resistance group P = 0.006 and in concurrent group P = 0.031). The glycemic index also didnt show any significant difference between the groups (P >0.05). There was no significant difference in HOMA-IR and the ratio of visceral fat to muscle mass between the groups (P >0.05). CONCLUSIONS Eight weeks of endurance, resistance and concurrent isocratic training had not any different in irisin changes and all training methods in inactive obese women caused a significant decrease in irisin levels