No acute effect of reduced-exertion high-intensity interval training on insulin sensitivity

Richard Metcalfe, Samantha Fawkner, Niels Vollaard

    Research output: Contribution to journalArticle

    Abstract

    We have previously demonstrated that reduced-exertion high-intensity interval training (REHIT), requiring a maximum of two 20-s all out cycling sprints in a 10-min exercise session, improves insulin sensitivity in sedentary men over a 6-week training intervention. However, the acute effects of REHIT on insulin sensitivity have not previously been described. In this study fourteen men and women (mean±SD age: 23±5 y; BMI 22.7±4.7 kg•m-2; V̇O2max: 37.4±8.6 mL•kg-1•min-1) underwent oral glucose tolerance testing 14-16 hours after an acute bout of reduced-exertion high-intensity interval training (2 x 20-s all-out sprints; REHIT), moderate-vigorous aerobic exercise (45 minutes at ~75% VO2max; AER), and a resting control condition (REST). Neither REHIT nor AER were associated with significant changes in glucose AUC (REHIT 609±98 vs. AER 651±85 vs. REST 641±126 mmol•l-1•120 min), insulin AUC (REHIT 30.9±15.4 vs. AER 31.4±13.0 vs. REST 35.0±18.5 nmol•l-1•120 min) or insulin sensitivity estimated by the Cederholm index (REHIT 86±20 vs. AER 79±13 vs. REST 82±24 mg•l2•mmol-1•mU-1•min-1). These data suggest that improvements in insulin sensitivity following a chronic REHIT intervention are the result of training adaptations rather than acute effects of the last exercise session.
    LanguageEnglish
    Pages1-3
    JournalInternational Journal of Sports Medicine
    Volume2015
    Publication statusPublished - 13 Sep 2015

    Fingerprint

    Insulin Resistance
    Exercise
    Area Under Curve
    High-Intensity Interval Training
    Glucose Tolerance Test
    Insulin
    Glucose

    Keywords

    • High-Intensity Interval Training
    • Insulin Sensitivity
    • Sprint Interval Training
    • Exercise Metabolism
    • Glucose Tolerance

    Cite this

    Metcalfe, Richard ; Fawkner, Samantha ; Vollaard, Niels. / No acute effect of reduced-exertion high-intensity interval training on insulin sensitivity. In: International Journal of Sports Medicine. 2015 ; Vol. 2015. pp. 1-3.
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    No acute effect of reduced-exertion high-intensity interval training on insulin sensitivity. / Metcalfe, Richard; Fawkner, Samantha; Vollaard, Niels.

    In: International Journal of Sports Medicine, Vol. 2015, 13.09.2015, p. 1-3.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - No acute effect of reduced-exertion high-intensity interval training on insulin sensitivity

    AU - Metcalfe, Richard

    AU - Fawkner, Samantha

    AU - Vollaard, Niels

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    AB - We have previously demonstrated that reduced-exertion high-intensity interval training (REHIT), requiring a maximum of two 20-s all out cycling sprints in a 10-min exercise session, improves insulin sensitivity in sedentary men over a 6-week training intervention. However, the acute effects of REHIT on insulin sensitivity have not previously been described. In this study fourteen men and women (mean±SD age: 23±5 y; BMI 22.7±4.7 kg•m-2; V̇O2max: 37.4±8.6 mL•kg-1•min-1) underwent oral glucose tolerance testing 14-16 hours after an acute bout of reduced-exertion high-intensity interval training (2 x 20-s all-out sprints; REHIT), moderate-vigorous aerobic exercise (45 minutes at ~75% VO2max; AER), and a resting control condition (REST). Neither REHIT nor AER were associated with significant changes in glucose AUC (REHIT 609±98 vs. AER 651±85 vs. REST 641±126 mmol•l-1•120 min), insulin AUC (REHIT 30.9±15.4 vs. AER 31.4±13.0 vs. REST 35.0±18.5 nmol•l-1•120 min) or insulin sensitivity estimated by the Cederholm index (REHIT 86±20 vs. AER 79±13 vs. REST 82±24 mg•l2•mmol-1•mU-1•min-1). These data suggest that improvements in insulin sensitivity following a chronic REHIT intervention are the result of training adaptations rather than acute effects of the last exercise session.

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    JO - International Journal of Sports Medicine

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    SN - 0172-4622

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