An indirect calorimeter for measuring the metabolic rate of a subject includes a respiratory connector configured to be supported in contact with the subject so as to pass inhaled and exhaled gases as the subject breathes, a flow pathway, and a hygiene barrier positioned to block a predetermined pathogen...http://www.google.se/patents/US20030065273?utm_source=gb-gplus-sharePatent US20030065273 - Metabolic calorimeter employing respiratory gas analysis
