[Six minute walk test: From normal to morbid obesity subject].

Introduction: Morbid obesity is associated with alterations in the ability to walk, however, the behavior of the 6-minute walk test in subjects with increases in body mass index is unknown.

Objective: To describe the behavior of the 6-minute walk test in subjects with normal body mass index to morbid obesity.

Methods: Through an analytical cross-sectional design, subjects of both genders from 18 to 60 years old with body mass index were studied: Normal (BMI:18.