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Related Experiment Videos

Comparison of submaximal exercise responses using the Bruce vs modified Bruce protocols

K J McInnis1, G J Balady

  • 1Cardiovascular Exercise Center, Boston University Medical Center, University Hospital, MA.

Medicine and Science in Sports and Exercise
|January 1, 1994
PubMed
Summary

Comparing exercise test protocols is crucial for evaluating training effects in patients with coronary artery disease. Standard and modified Bruce protocols yield similar submaximal results, but peak VO2 differs, highlighting protocol-specific influences.

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Area of Science:

  • Cardiology
  • Exercise Physiology

Background:

  • Evaluating training effects in stable coronary artery disease (CAD) relies on serial exercise testing.
  • Standardized protocols are essential for accurate comparison of physiological responses over time.

Purpose of the Study:

  • To assess if commonly used training effect parameters are comparable between standard and modified Bruce protocols.
  • To determine the influence of protocol differences on physiological variables during serial testing in CAD patients.

Main Methods:

  • Thirty-two stable CAD patients underwent both standard and modified Bruce protocols in random order, 1 hour apart.
  • Physiological variables (heart rate, rate-pressure product, VO2) were compared at matched submaximal exercise stages (I and II).
  • Peak VO2 was also compared between the two protocols.

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Main Results:

  • No significant differences in heart rate, rate-pressure product, or VO2 were observed at matched submaximal stages (I and II) between protocols.
  • Peak VO2 was significantly higher with the standard Bruce protocol compared to the modified version.
  • Submaximal heart rate response differences at matched workrates are likely training effects, not protocol differences.

Conclusions:

  • Submaximal physiological parameters are comparable between standard and modified Bruce protocols in stable CAD.
  • Improvements in peak VO2 may be influenced by inherent differences between the standard and modified Bruce protocols.
  • This suggests that training-induced changes in heart rate are more reliably assessed than peak VO2 when using different protocols.