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Related Experiment Videos

The heart rate turn point reliability and methodological aspects.

R Pokan1, P Hofmann, S P von Duvillard

  • 1Department of Sport Physiology, University of Vienna, Austria.

Medicine and Science in Sports and Exercise
|June 23, 1999
PubMed
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Altering the final acceleration phase of the Conconi test significantly impacts the heart rate performance curve (HRPC) and heart rate turn point (HRTP) detection. This modified protocol enhances HRTP identification in athletes with linear HRPC responses.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Cardiovascular Research

Background:

  • The Conconi test is a widely used method to determine the heart rate turn point (HRTP), a key indicator of anaerobic threshold.
  • Understanding the influence of protocol variations on HRPC and HRTP is crucial for accurate physiological assessment in athletes.
  • Previous research has established the framework for the heart rate performance curve (HRPC) and HRTP based on respiratory gas exchange.

Purpose of the Study:

  • To investigate the effects of modified Conconi test protocols on the heart rate performance curve (HRPC) and heart rate turn point (HRTP).
  • To determine if altering acceleration during the final phase of the test influences HRTP identification.
  • To analyze respiratory gas exchange variables for defining energy supply phases (I, II, III) within the test protocols.

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Main Methods:

  • Eighteen healthy young males performed four incremental running tests (T1-T4) with varying initial speeds and acceleration increments.
  • Tests T3 and T4 incorporated an increased acceleration rate in the latter half or at the beginning of phase III, respectively.
  • The deflection of the HRPC was quantified using the kHR factor, and HRTP was assessed alongside speed (S), heart rate (HR), and VO2.

Main Results:

  • Modified protocols (T3 and T4) significantly increased the deflection of the HRPC (kHR factor) compared to standard protocols (T1 and T2).
  • While kHR varied, it remained highly reproducible across all tested protocols.
  • The HRTP was found to be dependent on the timing of acceleration increase in phase III, with modified protocols revealing an HRTP in subjects who previously showed a linear HRPC.

Conclusions:

  • Accelerating the speed increase in the final phase of the Conconi test significantly influences the detection of the HRTP.
  • This modification is particularly effective in identifying the HRTP in individuals exhibiting a near-linear HRPC under standard testing conditions.
  • The study highlights the sensitivity of HRTP determination to specific protocol parameters, emphasizing the need for standardized yet adaptable testing methods.