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Cardiac size and VO2max do not decrease after short-term exercise cessation.

E M Cullinane, S P Sady, L Vadeboncoeur

    Medicine and Science in Sports and Exercise
    |August 1, 1986
    PubMed
    Summary
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    Ten days of detraining in endurance athletes led to a decrease in plasma volume and an increase in peak exercise heart rate. However, maximum oxygen uptake and cardiac dimensions remained unchanged.

    Area of Science:

    • Exercise Physiology
    • Cardiovascular Adaptations

    Background:

    • Endurance athletes undergo significant physiological adaptations to training.
    • The effects of short-term exercise cessation (detraining) on these adaptations are not fully understood.

    Purpose of the Study:

    • To investigate the impact of 10 days of detraining on maximal oxygen uptake, plasma volume, and cardiac dimensions in competitive male distance runners.

    Main Methods:

    • 15 male distance runners completed 10 days of exercise cessation after a 2-week period of daily 16 km running.
    • Measurements included maximal oxygen uptake, estimated plasma volume, cardiac dimensions, resting heart rate, and blood pressure before and after detraining.
    • Subjects maintained defined diets throughout the study.

    Main Results:

    Related Experiment Videos

    • Body weight decreased by 1.0 kg and estimated plasma volume decreased by 5.0% within 2 days of detraining.
    • No significant changes were observed in body weight, plasma volume, body fat percentage, resting heart rate, blood pressure, or cardiac dimensions after 10 days.
    • Maximal oxygen uptake remained unchanged, but peak exercise heart rate increased by 5%.

    Conclusions:

    • Short-term detraining (10 days) in endurance athletes significantly reduces estimated plasma volume and elevates peak exercise heart rate.
    • Cardiac dimensions and maximal oxygen uptake are resilient to brief periods of inactivity in this population.