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Related Experiment Videos

Maximal steady state versus state of conditioning.

B R Londeree, S A Ames

    European Journal of Applied Physiology and Occupational Physiology
    |December 5, 1975
    PubMed
    Summary

    The maximal steady state heart rate (MSSHR) at 2.2 mM/L blood lactate best predicts exercise conditioning. Relative VO2 at this point also accurately indicates fitness levels.

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    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Biochemistry

    Background:

    • Assessing maximal steady state (MSS) is crucial for understanding exercise physiology and an individual's state of conditioning.
    • Previous methods for determining MSS have varied, necessitating evaluation of reliable predictors.

    Purpose of the Study:

    • To evaluate criteria for identifying maximal steady state (MSS) in relation to an individual's current state of conditioning.
    • To determine the best physiological predictor of an individual's fitness level during exercise.

    Main Methods:

    • 13 volunteers underwent graded treadmill tests (walking/running) for 15 minutes.
    • Continuous heart rate monitoring, VO2 determination (6-9 min), and venous blood lactate analysis (10 & 15 min) were performed.
    • Subjects were categorized by their 6-month physical activity records to classify conditioning levels.

    Main Results:

    • The 10-minute heart rate at a blood lactate level of 2.2 mM/L (MSSHR) emerged as the strongest predictor of conditioning.
    • Relative VO2 at 2.2 mM/L blood lactate (RMSSVO2) was nearly as effective as MSSHR in predicting conditioning.
    • Lactate level changes between 10 and 15 minutes did not significantly correlate with conditioning status.

    Conclusions:

    • MSSHR is a highly effective and reliable indicator for assessing an individual's state of conditioning.
    • RMSSVO2 offers a comparable, accurate alternative for predicting fitness levels.
    • Lactate kinetics beyond 10 minutes are not critical for evaluating conditioning in this context.

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