title: Physical activity energy expenditure measured using a portable telemetric device in comparison with a mass spectrometer.
abstract: BACKGROUND
  Several studies have evaluated the accuracy of portable metabolic gas analysis systems, which measure physical activity energy expenditure. Since the Cosmed K2 telemetric system, two K4 devices (RQ and b2) have been developed.
  
  
  OBJECTIVE
  To compare measurements using the Cosmed K4 RQ with measurements by a traditional method (mass spectrometer) for a sample of healthy subjects performing physical exercise of various intensities.
  
  
  METHODS
  Nine healthy male footballers (mean (SD) age 18.3 (2.2) years) performed an incremental exercise running test from 8 km/h to exhaustion, with an increase of 2 km/h for each level of the test protocol. The expired air was collected simultaneously using the Cosmed K4 RQ and Airspec QP9000 mass spectrometer. Oxygen consumption (VO2) and carbon dioxide production (VCO2) were measured at rest and at each exercise intensity.
  
  
  RESULTS
  No significant differences were found between VO2 and VCO2 measured by the two instruments, at rest or during exercise.
  
  
  CONCLUSIONS
  The application of the Cosmed K4 RQ system for VO2 and VCO2 measurements at rest and during both submaximal and maximal exercise may be of interest to sport physiologists, nutritionists, and doctors.
mesh_terms: D000293:Adolescent; D000328:Adult; D002245:Carbon Dioxide / Q000378:metabolism; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D010101:Oxygen Consumption / Q000502:physiology; D011659:Pulmonary Gas Exchange / Q000502:physiology; D015203:Reproducibility of Results; D013686:Telemetry / Q000295:instrumentation / Q000379:methods*
chemical_list: D002245:Carbon Dioxide