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[Incremental stress test: comparison between protocols and cardiorespiratory reference values in healthy workers].

P Carta1, G Aru

  • 1Dipartimento di Sanità Pubblica, Sezione di Medicina del Lavoro, Università degli Studi di Cagliari. cartapl@pacs.unica.it

Giornale Italiano Di Medicina Del Lavoro Ed Ergonomia
|June 2, 2001
PubMed
Summary

Two incremental exercise protocols showed comparable results for maximal aerobic capacity and ventilatory anaerobic threshold in healthy workers. These findings support their use in evaluating working capacity for physically demanding jobs.

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Area of Science:

  • Exercise Physiology
  • Occupational Health
  • Cardiorespiratory Fitness

Background:

  • Standardized exercise testing is crucial for assessing working capacity in manual laborers.
  • Different incremental stress protocols exist, necessitating comparison for optimal application.
  • Reference values are needed for interpreting exercise test results in occupational settings.

Purpose of the Study:

  • To compare two distinct incremental cycle ergometer stress protocols (30 watts/3 min vs. 30 watts/1 min).
  • To establish reference values for a standardized exercise test in healthy workers.
  • To evaluate the ventilatory anaerobic threshold (VAT) and maximal oxygen uptake (V'O2 max).

Main Methods:

  • Eighty healthy male workers (coal miners and hospital staff) performed two cycle ergometer tests to exhaustion.

Related Experiment Videos

  • Breath-by-breath analysis measured ventilatory and gas exchange parameters (O2, CO2).
  • Ventilatory anaerobic threshold (VAT) was determined using standardized indices, comparable to lactate-based methods.

    • Main Results:

    • Both protocols yielded comparable maximal oxygen uptake (V'O2 max) and V'O2 at VAT.
    • Protocol B (30 watts/1 min) resulted in higher average work loads at exhaustion and VAT.
    • Oxygen uptake and heart rate increased linearly with work load, with similar slopes across protocols.

    Conclusions:

    • The two incremental exercise protocols demonstrate good comparability for assessing aerobic capacity and cardiorespiratory response.
    • Reference values for the 30 watts/3 minutes protocol were established for maximal and sub-maximal aerobic capacity.
    • These findings aid in evaluating the working capacity of individuals in physically demanding occupations.