ABSTRACTObjective:To compare the effect of CrossFit and concurrent aerobicþresistance training (CT) on cir-culating myonectin levels, insulin resistance index, and physical performance in young women.Materials and methods:Thirty healthy women were randomly assigned to CrossFit (n¼16) and CT(n¼14) groups, exercising three sessions per week for eight weeks. Serum myonectin levels, insulinresistance index, body composition, and performance variables were evaluated before and after theintervention period.Results:Neither the CrossFit nor the CT group improved in myonectin levels and insulin resistanceindex. While, fat percentage, muscle mass, upper-limb strength, VO2max, HR at rest, lower body meanpower output, and upper body peak power output improved more after CrossFit than the CT.Conclusion:It seems that CrossFit exercises by targeting multiple fitness components in one exercisesession may allow participants to perform more activity in less time.

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