Cross-cultural validation of an expanded Exercise Addiction Inventory: A preliminary protocol report

Abstract

Background and aims. In the last thirty years, the continuously increasing number of studies investigating Exercise Addiction (EA) stimulated interest in developing instruments assessing the risk of exercise addiction (REA). One widely used tool is the Exercise Addiction Inventory (EAI) because it is a brief, easy-to-use, time-saving, and psychometrically validated tool. However, its items based on the Components Model of Addiction still lack some reoccurring symptoms associated with exercise addiction. This protocol report outlines the methods of developing and validating an expanded version of the EAI (EAI-3) in a large international sample.Methods. The EAI-3 will be administered to over 5000 regular exercisers in 15 languages through an online survey. The survey will also include questions from the Exercise Dependence Scale-Revised, the Obsessive-Compulsive Inventory-Revised, the SCOFF questionnaire, and the Ten Item Personality Inventory. We will investigate the factorial structure of the EAI-3 through confirmatory factor analysis. Moreover, we will test EAI-3’s measurement invariance across languages and gender. Finally, we aim to find a standard cutoff point for at-risk exercisers. Expected results. We expect to obtain a good fit of the EAI-3 structure and general measurement invariance. In addition, we expect associations with another EA measure and the other measures of mental health assessed in the study.Discussion and conclusions. We expect that the results will support an assessment tool useful in measuring the REA with greater accuracy and exhibiting reliability across gender and language (culture).