Therefore, the aim of the present study was to assess the validity of the questionnaire against the DLW method in a larger population of 30 patients with CHF more representative of the general population with CHF, including men and women, NYHA I to IV, with a larger age panel. Along with this concordance study, a measurement of the energy cost of specific physical activities of daily life is performed with an ambulatory gaz analyzer method to further validate the calculation method of daily energy expenditure from the questionnaire.