Skip Navigation LinksHome > May 2003 - Volume 35 - Issue 5 > COMPARISON OF VENTILATORY THRESHOLD MEASUREMENTS MADE BY AMB...
Medicine & Science in Sports & Exercise:
C-15J Free Communication/Poster Anaerobic Threshold

COMPARISON OF VENTILATORY THRESHOLD MEASUREMENTS MADE BY AMBULATORY PLETHYSMOGRAPHY AND BY A MASS FLOW DEVICE

Thompson, S M.1; Coyle, M A.1; Stager, J M. FACSM1; Brown, J B.1

Free Access
Article Outline
Collapse Box

Author Information

1University of Indianapolis, Indianapolis, IN Indiana University, Bloomington, IN Vivometrics Inc. Ventrua, CA

Back to Top | Article Outline

PURPOSE

The determination of ventilatory threshold (Tvent) has proven useful in the assessment of training effectiveness. However, as yet, determination of Tvent has been restricted to the laboratory. Thus, we compared a novel ambulatory monitoring system that uses inductive plythesmography (LifeShirtTM, VivoMetrics, Inc., Ventura, CA) to Tvent determined by a standard mass flow device (Hector Engineering, Bloomington, IN).

Back to Top | Article Outline

METHODS

Five subjects wore the LifeShirtTM (LS) during a graded exercise test to Vo2 max. During the test, metabolic activity was measured by open flow indirect calorimetry. Ventilation was monitored simultaneously by the mass flow device (MF) and LS. The exercise intensity (as indicated by Vco2) where Tvent occurred was determined by the V-slope method. Inter-device differences in Tvent values were tested within each subject by paired student's t-test (p < 0.05).

Back to Top | Article Outline

RESULTS

Exercise intensity where Tvent occurred did not differ between LS (Vco2 = 3.18 ± 0.70 L/min) and MF (Vco2 = 3.21 ± 0.66 L/min).

Back to Top | Article Outline

CONCLUSION

These data suggest the ambulatory technology (as employed by LifeShirtTM) can be used to characterize the ventilatory responses to exercise at different intensities.

©2003The American College of Sports Medicine

Login

Article Tools

Share

Connect With Us