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Related Experiment Videos

Circadian specificity in exercise training.

D W Hill, K J Cureton, M A Collins

    Ergonomics
    |January 1, 1989
    PubMed
    Summary

    Exercise training adaptations show circadian specificity. Training effects on VO2 max and performance were consistent, but VO2 at the ventilatory threshold was higher when tested at the same time of day as training.

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    Letters.

    The Physician and sportsmedicine·2016

    Area of Science:

    • Exercise physiology
    • Circadian rhythms
    • Sports science

    Background:

    • Exercise training induces significant metabolic and cardiorespiratory adaptations.
    • The influence of the time of day on the magnitude of these adaptations is not fully understood.
    • Understanding circadian influences can optimize training protocols.

    Purpose of the Study:

    • To investigate if metabolic and cardiorespiratory adaptations to exercise training are time-of-day dependent.
    • To determine if training at a specific time of day enhances adaptations at that time.
    • To explore the concept of circadian specificity in exercise training.

    Main Methods:

    • Twenty-seven subjects underwent cycle ergometer tests in the morning (AM) and afternoon (PM).
    • Subjects were divided into groups: morning training (n=10), afternoon training (n=7), and a control group (n=10) for 6 weeks.
    • Measurements included heart rate (HR), ventilation (VE), rating of perceived exertion (RPE), maximal oxygen uptake (VO2 max), and performance time.

    Main Results:

    • Six weeks of training led to decreased submaximal HR, VE, and RPE.
    • Significant improvements were observed in VO2 max (7.7%) and performance time (9.1%).
    • Adaptations were generally time-independent, except for VO2 at the ventilatory threshold, which showed circadian specificity.

    Conclusions:

    • Exercise training adaptations exhibit circadian specificity, particularly for VO2 at the ventilatory threshold.
    • Training in the morning resulted in higher morning thresholds, while afternoon training yielded higher afternoon thresholds.
    • Athletes should consider aligning training schedules with competition times for optimal performance benefits.

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