Reliability of a new device to assess the oxygen consumption of human respiratory muscles

Abstract

The results confirm that the test performed with this device is useful and reliable for assessing the VO2 resp. in healthy subjects.

Gender Influence on the Oxygen Consumption of the Respiratory Muscles in Young and Older Healthy Individuals

“…Comparison with conventional methods Our log V Ç O 2 tot ± V Ç E value of 0.0097 log (mL min ±1 )/(L min ±1 ) in young subjects is at the higher end of normal when compared with the values in the literature. It is similar to those values reported by Fritts et al [11] (0.0083), Takishima et al [22] (0.0072), Cherniack et al [5] (0.0071) and our previous results (0.0066) [2]. However, our mean slope value is higher than the values reported by Bartlett et al [4] (0.0042) and Campbell et al [7] (0.0011).…”

“…No age differences were found between groups I and II, and groups III and IV. As in a previous study [2], the nature, procedures and equipment were explained to each subject. Oral consent was obtained before performing the non-invasive measurements.…”

“…We assessed O 2 consumption with a modification of the technique [2] originally proposed by Cherniack [5]. A continuously increasing dead space volume inserted between the subject and the 9-L Gould spirometer was used to produce various levels of pulmonary ventilation.…”

“…In a previous study [2], we modified Cherniack's method [5] by using a closed-circuit and an expandable external dead space volume. The advantage of this method, which we used in the present study, was that the expandable dead space allowed a detailed analysis of V Ç O 2 resp because V Ç O 2 was continuously measured over a range of ventilation between 10 to 45 L min ±1 .…”

“…The aim of this study was thus to compare the oxygen consumption of the respiratory muscles in younger and older males and females. To measure V Ç O 2 resp, we used a simple device recently validated in our laboratory [2] which allowed us to increase the external ventilatory dead space volume using the method developed by Cherniack [5] and modified by Takishisma et al [22].…”