Reliability of Respiratory Inductive Plethysmography for Measuring Tidal Volume During Exercise

Abstract

This study was designed to determine the reliability of measurements of respiratory volumes obtained with a respiratory inductive plethysmograph (RIP) during exercise. Tidal volumes (VT) from the RIP were compared with simultaneous flowmeter volumes in 8 healthy subjects at 5 incremental work rates of 60, 90, 120, 150, and 180 W during cycling and treadmill exercise. During cycling, average RIP and flowmeter values did not differ significantly at work rates below 180 W for 63% of the subjects. Average RIP and flowmeter VT were similar at work rates below 180 W for 50% of the subjects, and for 83% of the subjects at intensities below 150 W. The variability in these results may be attributed to several factors including RIP calibration errors and slippage of the RIP elastic bands containing the inductive coils. Correlations of breath-by-breath flowmeter and RIP VT were significant for subjects during cycling (R = 0.73, P < 0.05) and treadmill exercise (R = 0.78, P < 0.05). These findings suggest that the RIP should be considered a semi-quantitative method for measurements of tidal volume during exercise with and without respirator wear.

Impaired abdominal muscle contractility after high‐intensity exhaustive exercise assessed by magnetic stimulation

“…8 Moreover, respiratory inductive plethysmography is a reliable tool to measure ventilation during exercise. 11,36 Hence, we believe that the use of Respitrace in the present study allows us to estimate abdominal muscle work during exercise.…”

Analysis of Thoracoabdominal Motion during Incremental Work Cycle Exercise.

“…We defined 100% VT to be the average volume of chest and abdominal motion during the initial 5-minutes calibration period at rest in the sitting position on a bicycle ergometer. The accuracy of this device has been previously reported 11) . The analog data of TV and thoracoabdominal motion were input into a personal computer, and synchronized with a software program (Biopack System Inc, San Diego, CA) as shown in Fig.…”

Physiological Monitoring in Firefighter Ensembles: Wearable Plethysmographic Sensor Vest versus Standard Equipment

“…(14) Limitations of our study include the relatively small sample size (10 subjects) that may have been too undersized to detect a true difference (β-error) between the two test systems, although other LifeShirt studies have utilized similar numbers and achieved statistical significance. (4) Also, although we tested our subjects at 50%V O 2max , firefighters often have short bursts of activity at much higher levels, and a prior comparison of the LifeShirt and pneumotachograph noted that discrepancies inV E between the two systems grow larger with increasing exercise intensity. (17) Therefore, it is theoretically possible that had we employed a greater workload in the study, we might have noted greater variance inV E measurements between the two systems.…”

“…Physiological data monitored by wearable plethysmographic sensors vests are usually stored onto a small, portable data recorder carried in a pouch attached to the vest and telemetered in real-time to a laptop computer. The wearable plethysmographic sensors vests have been used in research under high gravitational force environments, (3) with exercise, (4) and at rest with resistive loads. (5) These studies evaluated the system under different conditions, but they were not a comparison study wearing firefighting ensembles.…”