Incremental exercise test performance with and without a respiratory gas collection system

J Clark

doi:10.17159/2078-516x/2008/v20i2a628

Abstract

Objective. Despite their widespread use in exercise testing, few data are available on the effect of wearing respiratory gas collection (RGC) systems on exercise test performance. Industrial-type mask wear is thought to impair exercise performance through increased respiratory dead space, flow resistance and/or discomfort when compared with RGC facemasks, but whether performance decrements exist for RGC facemask wear versus non-wear is unclear. The objective of this study was to evaluate the difference in incremental exercise test performance with and without a RGC system. Incremental exercise test performance with and without a respiratory gas collection system Design. Twenty moderately active males (age 21.0 ± 1.9 years; VO2peak 55.9 ± 3.0 ml∙kg-1∙min-1) performed two progressive treadmill tests to volitional exhaustion. In random order subjects ran with (MASK) or without (NO-MASK) a RGC facemask and flow sensor connected to a gas analyzer. Descriptive data (mean ± SD) were determined for all parameters. The Wilcoxon signed rank test for paired differences was used to assess mean differences between MASK and NO-MASK conditions. Results. Exercise time to exhaustion, peak treadmill speed, peak blood lactate concentration, peak heart rate and rating of perceived exertion (RPE) were not different (p>0.05) between MASK and NO-MASK conditions. Conclusions. Incremental exercise test performance is not adversely affected by RGC and analysis equipment, at least in short duration progressive treadmill exercise. Respiratory gas analysis during exercise testing for diagnostic, performance assessment or training prescription purposes would appear to be unaffected by RGC systems.

Highlights

Exercise testing with respiratory gas collection (RGC) and analysis during indirect calorimetry has long been a routine procedure in exercise physiology laboratories, enabling the simultaneous measure-SAJSM vol 20 No 2 2008 pg40-48.indd 448/11/08 8:49:20 AM ment of respiratory, cardiovascular and metabolic variables.[24]
There were no significant differences between MASK and NO-MASK conditions for any of these variables
The major finding of this study was that there were no significant differences between MASK and NO-MASK conditions in incremental exercise test performance

Summary

Introduction

Exercise testing with respiratory gas collection (RGC) and analysis during indirect calorimetry has long been a routine procedure in exercise physiology laboratories, enabling the simultaneous measure-SAJSM vol 20 No 2 2008 pg40-48.indd 448/11/08 8:49:20 AM ment of respiratory, cardiovascular and metabolic variables.[24]. A range of RGC and analysis systems are available to measure airflow, gas concentrations, and other respiratory variables in the laboratory or field.[24] Yet a compulsory element of all systems remains the need for a facemask or mouthpiece to physically sample expired air. This involved a mouthpiece and nose clip, but the oro-nasal facemask has become an increasingly common method of gas collection. This raises the concern that exercise testing with RGC systems may not produce truly representative exercise data, potentially affecting the accuracy and value of subsequent performance analysis, training prescription or diagnosis.[5,10]

Methods

Results

Discussion

Conclusion