摘要：The recent development of portable metabolic gas analysis systems gives scientists the capability of measuring physiological data, including oxygen consumption, associated with multi-directional movements in the field. However, careful consideration is necessary when comparing data from two metabolic systems (Jakovljevic et al., 2008), such as a portable metabolic system and a laboratory metabolic cart. Our group was specifically interested in comparing gas analysis data obtained using a portable metabolic system, the K4b2 (COSMED srl, Rome, Italy), and the laboratory metabolic cart, the TrueOne® 2400 (Parvo Medics, Salt Lake City, UT). Although the readings from the K4b2 were similar to those from the Douglas-bag method during exercise (McLaughlin et al., 2000), Duffield et al., 2004 found that the K4b2 did not compare well to a standard laboratory metabolic cart. Furthermore, values measured by the K4b2 have not been directly compared to those measured by the TrueOne 2400 (T2400), which also gives readings similar to those from the Douglas-bag method (Bassett et al., 2001; Crouter et al., 2006). The purpose of this investigation was to assess the agreement between measurements of A) relative oxygen consumption (VO2), B) respiratory exchange ratio (RER), and C) minute ventilation (VE), obtained from the K4b2 and the T2400 during level treadmill exercise.
