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    Area of Science:

    • Sports Science
    • Exercise Physiology
    • Running Performance

    Background:

    • Understanding the relationship between training load and performance is crucial for optimizing athletic training.
    • Continuous (CON) and intermittent (INT) training sessions differ in physiological demands and impact on recovery.
    • Existing training load (TL) metrics may not accurately capture the acute effects of diverse training protocols on performance.

    Purpose of the Study:

    • To investigate how continuous and intermittent running training sessions of varying durations and intensities affect subsequent running performance.
    • To compare the acute performance decrement (APD) with calculated training load (TL) metrics following different running training protocols.

    Main Methods:

    • Eleven runners completed a 1500-m time trial as a baseline and post-training.
    • Four randomized training sessions were performed: 10-minute maximal (10CON, 10INT) and 25-minute submaximal (25CON, 25INT).
    • Acute performance decrement (APD) was measured as the change in 1500-m time-trial speed; TL was assessed using bTRIMP, eTRIMP, iTRIMP, running training stress score, and session rating of perceived exertion.

    Main Results:

    • All training sessions caused a significant acute performance decrement (APD).
    • APD was generally similar across sessions, with a greater decrement after 10INT compared to 25CON.
    • Training load (TL) metrics showed significant differences, often in opposition to APD trends, with higher loads for CON vs. INT and shorter vs. longer durations.

    Conclusions:

    • Acute performance decrement (APD) consistently occurred after running training sessions.
    • Most calculated training load (TL) metrics did not align with the observed APD.
    • The discrepancy suggests current TL quantification methods may be inadequate for comparing continuous and intermittent running sessions with varied durations and intensities.