Study the amount and kind of dietary supplements consumption in Iranian athletes participating in the London 2012 Olympic Games based on a theory of planned behavior

Due to the increasing use of sports supplements and their harmful effects have been reported in different studies, understanding of the types, causes and motives of these materials is necessary and important. The aim of present research was to study the amount and kind of dietary supplements consumption in Iranian athletes participating in the London 2012 Olympic Games based on a theory of planned behavior. Iranian 42 Athletes (participating in the 2012 London Olympics) participated in the study. To data collection, two questionnaires (surveying the sports supplements questionnaire in sports (with 4 scales) and researcher maid questionnaire) were used. All analyzes were performed by the SPSS16 and AMOS softwares.To determine the components of the fit index, the chi-square, NFI and RMSEA were used. main source of supplemental bidder among Iran's Olympic athletes, was nutritionists (43%). for main reasons of athletes for supplement consumption, increased speed and agility (48%) and increased strength and power (47%) were reported. The greatest consumed supplement in athletes was order B-complex (92%). However, unlike previous studies, the mental norms was the most strong predictive index (β = 0/91) while the attitudes (β = 0/23) was the second predictive indicator and perceived behavioral control (β = 0/13) was the weakest predictive index. Lack of influence of perceived behavioral control is consistent with previous studies but not being of influence of attitudes is ambiguous. Because it is believed that behavioral intentions strongly is controlled by accepting the norm no with attitudes toward supplements. These findings indicate that in Iran Olympic athletes, the mental norms are probably more important in formation of behavioral intentions for dietary supplements consumption.