Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Turbine flowmeter vs. Fleisch pneumotachometer: a comparative study for exercise testing.

M P Yeh1, T D Adams, R M Gardner

  • 1Fitness Institute, LDS Hospital, Salt Lake City 84143.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1987
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

The impact of timing modified natural cycle frozen embryo transfer based on spontaneous luteinizing hormone surge.

Journal of assisted reproduction and genetics·2020
Same author

Achievements after Six Years of The International Partnership for Health Informatics Education.

Yearbook of medical informatics·2016
Same author

University of Utah Medical Informatics Research and Training Program.

Yearbook of medical informatics·2016
Same author

Clinical Information Systems - From Yesterday to Tomorrow.

Yearbook of medical informatics·2016
Same author

Maternal polycystic ovary syndrome and the risk of autism spectrum disorders in the offspring: a population-based nationwide study in Sweden.

Molecular psychiatry·2015
Same author

Maternal and neonatal outcomes for pregnancies before and after gastric bypass surgery.

International journal of obesity (2005)·2015
Same journal

Thoroughbred horses susceptible to Recurrent Exertional Rhabdomyolysis have elevated skeletal muscle mitochondrial capacities.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same journal

Change in Neutrophil-to-Lymphocyte Ratio after acute and chronic exercise: A Systematic Review and Meta-Analysis.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same journal

Ankylosing spondylitis and muscle sympathetic nerve activity: a case study.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same journal

Intracranial vasomotor and blood flow responses to light intensity aerobic exercise in young adults: a 4D flow MRI study.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same journal

Comparative assessments of the COSMED adaptive mixing chamber vs. breath-by-breath methods for oxygen uptake measurements in recreationally active adults.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
Same journal

Can we assess exercise metabolism from skin? Metabolomic profiles in skin dialysate collected during exercise.

Journal of applied physiology (Bethesda, Md. : 1985)·2026
See all related articles

A new turbine flowmeter showed acceptable expiratory flow (VE) accuracy but significant errors in oxygen uptake (VO2) and carbon dioxide output (VCO2) measurements during exercise testing, especially at rest.

Area of Science:

  • Cardiorespiratory Physiology
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Accurate measurement of respiratory gases during exercise is crucial for physiological assessment.
  • Traditional Fleisch pneumotachometers are widely used but can be bulky and have limitations.
  • Novel turbine flowmeters offer potential advantages in exercise testing systems.

Purpose of the Study:

  • To evaluate the performance of a new turbine flowmeter (Alpha Technologies, VMM-2) in an exercise testing system.
  • To compare its accuracy against a Fleisch pneumotachometer for measuring expiratory flow (VE), oxygen uptake (VO2), and carbon dioxide output (VCO2).

Main Methods:

  • A breath-by-breath system was developed using an IBM PC/AT, integrating a turbine flowmeter and dual Fleisch pneumotachometers in series.

Related Experiment Videos

  • Measurements were taken from a single subject at rest and during exercise (100-W and 175-W).
  • Expired gas was collected in a Douglas bag for comparison.

    • Main Results:

    • Expiratory flow (VE) measurements showed <4% accuracy for both systems.
    • The Fleisch system achieved 5% accuracy for VO2 and VCO2.
    • The turbine flowmeter system exhibited up to 20% error for VO2 and VCO2 at rest, decreasing with increased workload.
    • Turbine flowmeter signals displayed lag-before-start and spin-after-stop effects, impacting accuracy at low flow rates.

    Conclusions:

    • The turbine flowmeter demonstrated acceptable accuracy for VE but significant errors for VO2 and VCO2, particularly at rest.
    • The observed "lag-before-start" and "spin-after-stop" artifacts limit its utility for precise metabolic measurements in exercise testing.
    • Further development is needed to address these dynamic response issues for accurate VO2 and VCO2 determination.