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The estimation of ventilation and oxygen consumption from chestwall movement
Abstract
Estimation of energy expenditure (EE) is an important concern for several research areas including nutrition, ergonomics, exercise science, and epidemiology. Current methods for field assessment of EE include questionnaire/survey, movement counters, dietary intake, heart rate monitoring and doubly-labeled water. Concern over validity and reliability of these methods suggests that improved measurement techniques might contribute to more valid research conclusions. The present study was designed to explore the relationship between chestwall movement (CW) (amplitude and frequency) and EE during incremental cycle ergometer tests (rest, 35%, 55%, 75% VO$\sb2$ max). An equation linking Ve and/or VO$\sb2$ and CW could be used to estimate EE. Physical characteristics for 10 male subjects are presented in the table below. sk80Description of Subjects (UNFORMATTED TABLE OR EQUATION FOLLOWS)$$\vbox{\halign{#\hfil&&\qquad#\hfil\cr&Var&Min&Max&Mean&SD\cr\cr &AGE&21.00&33.00&28.40&3.53\cr &WT&64.30&94.10&76.65&8.53\cr&HT&74.00&86.00&79.45&4.44\cr &VO2MLmax&46.84&70.13&54.16&6.94\cr &VO2Lmax&\ 3.42&\ 4.99&\ 4.12&\ 0.44\cr &VEmax&85.91&120.27&107.48&11.63\cr}}$$(TABLE/EQUATION ENDS) CW was monitored by a strain-gauge device (Pneumobellow, Lafayette Instruments, Lafayette, IN). A TV/CW and VO$\sb2$/CW regression equation was calculated for each subject on 3 test days. Overall (GRP) equations pooled across subjects were also calculated. The results suggest that individual equations for estimating both Ve and VO$\sb2$ are better than the GRP equations, particularly at the 55% and 75% VO$\sb2$ max workloads. The SD of residuals for estimated Ve were 2-3 L/min at rest and 7-11 L/min at 75% VO$\sb2$ max. For estimated VO$\sb2$, corresponding SD's were 1-2 ml/kg/min and 4-6 ml/kg/min. Expressed as a percent of total observed Ve and VO$\sb2$, SD of residuals 11.6% and 16.2% for Ve and VO$\sb2$, respectively. There was little empirical difference in estimation of Ve or VO$\sb2$ between the linear and quadratic models. Several sources of measurement error were identified and the need for further refinement of the technique was emphasized. The practical usefulness of the relationship between CW and either TV or VO$\sb2$ will depend upon the level of precision desired for quantification of EE or physical activity.
Subject Area
Public health|Physiology
Recommended Citation
Kline, Gregory Michael, "The estimation of ventilation and oxygen consumption from chestwall movement" (1990). Doctoral Dissertations Available from Proquest. AAI9100517.
https://scholarworks.umass.edu/dissertations/AAI9100517