Measuring energy requirements during pulmonary exacerbations of cystic fibrosis using indirect calorimetry

•Resting energy expenditure was stable during exacerbation and clinical stability.•Predictive equations underestimate energy requirements.•Use of 110% to 130% injury factor to predictive equations is adequate.•Incorporation of body composition analysis in nutrition assessment is encouraged .•Indirect calorimetry may strengthen nutrition assessment in cystic fibrosis.