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Alactic capacity and power: reliability and interpretation

M N Sawka, M V Tahamont, P I Fitzgerald

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1980
    PubMed
    Summary
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    This study found that maximal alactic capacity (ALCmax) and alactic power (ALPmax) measurements are reliable for both men and women. While men showed higher values, the capacity-to-power ratio was similar across sexes.

    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Human Performance Measurement

    Background:

    • Alactic capacity (ALCmax) and alactic power (ALPmax) are crucial metrics in assessing anaerobic energy system contribution.
    • Understanding the reliability and sex-based differences in these measures is important for accurate performance evaluation.
    • Previous research has indicated potential variations in energy metabolism between sexes.

    Purpose of the Study:

    • To determine the test-retest reliability of maximal alactic capacity (ALCmax) and alactic power (ALPmax) measurements.
    • To investigate potential sex differences in ALCmax and ALPmax.
    • To explore the relationship between ALCmax and ALPmax.

    Main Methods:

    • Thirty-one men and 13 women performed two separate ALCmax and ALPmax tests.

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  • Test-retest reliability was assessed using correlation coefficients.
  • Independent t-tests were used to compare means between sexes.

    • Main Results:

    • High test-retest reliability was observed for both ALCmax (r=0.78) and ALPmax (r=0.90), with no significant differences between tests.
    • Men exhibited significantly higher ALCmax (429 J.kg-1) and ALPmax (3.79 W.kg-1) compared to women (317 J.kg-1 and 3.08 W.kg-1, respectively).
    • The capacity-to-power ratio (ALCmax.ALPmax-1) did not differ between sexes, and a moderate correlation (r=0.61) was found between ALCmax and ALPmax.

    Conclusions:

    • Measurements of ALCmax and ALPmax demonstrate good test-retest reliability in trained individuals.
    • Sex differences in ALCmax and ALPmax likely relate to physiological factors such as body composition.
    • The findings support the use of these measures for assessing anaerobic performance and its reliability in diverse populations.