INTRODUCTION: Obesity is known as a chronic inflammatory state in which anti-inflammatory adipokines level such as Omentin-1 decreases and this is directly linked with cardiovascular diseases. Therefore, this study was performed with aim to investigate the effect of eight weeks of circuit resistance training and cinnamon supplement on body composition and omentin-1 in overweight women. METHODS: This clinical trial study was performed on all overweight female students at Zahedan Farhangian University in 2015 to 16. The subjects were randomly divided into four groups: exercise+placebo, exercise+cinnamon, cinnamon and control. Resistance training was three times a week and each session for 50 minutes. Supplement group consumed one capsule containing 0.5 g cinnamon, one hour before breakfast and one hour before dinner for eight weeks. Seca height and weighing scales (model 220 made in Germany) was used to measure height and weight; BMI was measured as dividing weight (kg) on square height (m); the bondor kit made by East Biopharm Co was used to measure Omentin-1 through ELISA method, and the HOMA-IR index was used to evaluate the insulin-resistance index. Data was analyzed by SPSS software (version 16) and Shapiro-Wilk test, Levene, dependent-t and ANOVA tests. p < 0.05 was considered significant. RESULTS: Omentin-1 values significantly increased in the groups of exercise+cinnamon (p = 0.001) and cinnamon (p = 0.001). Significant decrease was observed in body weight in three groups of exercise (p = 0.030), exercise+cinnamon (p = 0.021) and cinnamon (p = 0.036). BMI was also significantly declined in three groups of exercise (p = 0.038), exercise+cinnamon (p = 0.02) and cinnamon (p = 0.046). Changes in waist to hip rate were not significant in any of the groups. Also, no significant difference was found between the groups in none of the variables (p = 0.93). CONCLUSION: Resistance training as non-invasive intervention along with cinnamon consumption as well as cinnamon consumption alone increase Omentin-1 serum level (anti-inflammatory agent) and improve the body composition.

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