To our knowledge no study has evaluated neither feasible methods for the assessment of anthropometric profile nor indirect methods to estimate energy expenditure (EE) for adapted athletes. The primary aim is to develop and validate new RMR prediction models, for the estimation of the resting metabolic rate from anthropometric variables in young Mexican Paralympic athletes; our second objective is to evaluate the agreement between RMR and the prediction models of Cunningham, Harris-Benedict, Henry, Valencia, Chun, Nightingale & Gorgey, FAO/WHO, Mifflin, Müller, Owen, and our own models. A comparative cross-sectional quantitative study was designed. Participants report to the testing laboratory only once for data collection. The Strengthening the Reporting of Observational Studies in Epidemiology criteria guidelines for cross-sectional research (STROBE) is followed in the design/reporting of this study.

Inclusion Criteria:

i) swimmers who report to the assessment area with a fasting period of 6 to 8 hours, and at least 12 hours after their last exercise routine; ii) swimmers who have not consumed alcohol or any stimulant for the last 48 hours (e.g., coffee, tea, chocolate, carbonated drinks, energy drinks, supplements); iii) swimmers who has contested at least in one of the last two swimming competitions, including World Championships and Paralympic Games

Exclusion Criteria:

i) fail to complete the indirect calorimetry test after two attempts; ii) attend to the evaluation area without the appropriate clothing or without following the instructions for fasting, exercise, and feeding prior to the evaluations; iii) swimmers who at the time of the evaluations did not give written consent (parental consent in case of under 18 years old) for procedures or data release for research purposes.

Mexican Paralympic swimmers from the national and the state adapted swimming team.