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Haemoglobin saturation during incremental arm and leg exercise.

S K Powers, S Dodd, J Woodyard

    British Journal of Sports Medicine
    |September 1, 1984
    PubMed
    Summary
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    This study found that oxygen saturation (%SO2) decreases similarly during both incremental arm and leg exercise. Significant changes in %SO2 occurred at high exercise intensities, above 70% VO2 max.

    Area of Science:

    • Exercise Physiology
    • Cardiorespiratory Function

    Background:

    • Limited research exists on oxygen saturation (%SO2) changes during non-steady state incremental exercise.
    • No data have described %SO2 alterations during incremental arm exercise.

    Purpose of the Study:

    • To investigate the dynamic changes in %SO2 during incremental arm and leg exercise.
    • To compare %SO2 responses between arm and leg ergometry.

    Main Methods:

    • Nine trained subjects (7 males, 2 females) underwent incremental arm and leg exercise to exhaustion.
    • Minute-by-minute ventilation and gas exchange were measured using open-circuit spirometry.
    • %SO2 was continuously monitored using an ear oximeter.

    Main Results:

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  • No significant differences were observed in end-tidal oxygen (PETO2), end-tidal carbon dioxide (PETCO2), or %SO2 between arm and leg exercise relative to VO2 max.
  • Arterial oxygen desaturation occurred similarly during both exercise modalities.
  • Greatest %SO2 changes were noted at work rates exceeding 70% VO2 max.

    • Conclusions:

    • Incremental arm and leg exercise elicit comparable arterial oxygen desaturation.
    • Oxygen desaturation during incremental exercise is intensity-dependent, becoming more pronounced at higher workloads.