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Oxygen uptake kinetics during low intensity exercise: relevance for rate adaptive pacemaker programming

T Lewalter1, H Rickli, D MacCarter

  • 1Department of Medicine-Cardiology, University of Bonn, Germany.

Heart (British Cardiac Society)
|February 1, 1997
PubMed
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This study establishes normal oxygen uptake (VO2) kinetics during low intensity treadmill exercise (LITE) for pacemaker programming. These VO2 kinetics during LITE correlate with VO2 at anaerobic threshold and peak exercise.

Area of Science:

  • Exercise Physiology
  • Cardiovascular Physiology

Background:

  • Establishing normal oxygen uptake (VO2) kinetics is crucial for optimizing cardiovascular device programming.
  • Low Intensity Treadmill Exercise (LITE) offers a practical method for assessing VO2 kinetics, applicable in various clinical settings.

Purpose of the Study:

  • To create a normative database for VO2 kinetics during LITE.
  • To guide the programming of rate-adaptive pacemakers.
  • To investigate the relationship between LITE VO2 kinetics and VO2 at anaerobic threshold (VO2-AT) and peak exercise (VO2-peak).

Main Methods:

  • Sixty healthy subjects underwent treadmill exercise testing.
  • The LITE protocol was used for steady-state, submaximal exercise assessment.
  • The ramping incremental treadmill exercise (RITE) protocol assessed peak exercise.

Related Experiment Videos

  • Breath-by-breath gas exchange monitoring was employed.

    • Main Results:

    • Normal VO2 kinetics during LITE were established: mean response time (35.1 ± 9.9 s), oxygen deficit (418.3 ± 47.9 ml), and oxygen deficit/VO2 time index (54.7 ± 7.4).
    • VO2-AT was 22.1 ± 5.7 ml/kg/min and VO2-peak was 37.6 ± 10.7 ml/kg/min.
    • Significant correlations were found between LITE VO2 kinetics (mean response time, oxygen deficit/VO2 time index) and both VO2-peak and VO2-AT (P < 0.01).

    Conclusions:

    • The established VO2 kinetics database from healthy individuals can inform pacemaker rate-response programming.
    • LITE provides a clinically relevant assessment of aerobic function, reflecting daily activities.
    • LITE's significant relationship with VO2 at anaerobic threshold and peak exercise supports its utility in clinical practice.