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Comparison of cerebrovascular reactivity recovery following high‐intensity interval training and moderate‐intensity continuous training
Author(s) -
Burma Joel S.,
Macaulay Alannah,
Copeland Paige,
Khatra Omeet,
Bouliane Kevin J.,
Smirl Jonathan D.
Publication year - 2020
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.14467
Subject(s) - medicine , heart rate , middle cerebral artery , intensity (physics) , cardiology , transcranial doppler , hyperventilation , high intensity interval training , interval training , anesthesia , cerebral blood flow , physical therapy , blood pressure , ischemia , physics , quantum mechanics
A common inclusion criterion when assessing cerebrovascular (CVR) metrics is for individuals to abstain from exercise for 12–24 hr prior to data collections. While several studies have examined CVR during exercise, the literature describing CVR throughout post‐exercise recovery is sparse. The current investigation examined CVR measurements in nine participants (seven male) before and for 8 hr following three conditions: 45‐min moderate‐continuous exercise (at ~50% heart‐rate reserve), 25‐min high‐intensity intervals (ten, one‐minute intervals at ~85% heart‐rate reserve), and a control day (30‐min quiet rest). The hypercapnic (40–60 mmHg) and hypocapnic (25–40 mmHg) slopes were assessed via a modified rebreathing technique and controlled stepwise hyperventilation, respectively. All testing was initiated at 8:00a.m. with transcranial Doppler ultrasound measurements to index cerebral blood velocity performed prior to the condition (pre) with serial follow‐ups at zero, one, two, four, six, and eight hours within the middle and posterior cerebral artery (MCA, PCA). Absolute and relative MCA and PCA hypercapnic slopes were attenuated following high‐intensity intervals at hours zero and one ( all p <  .02). No alterations were observed in either hypocapnic or hypercapnic slopes following the control or moderate‐continuous exercise ( all p >  .13), aside from a reduced relative hypercapnic MCA slope at hours zero and one following moderate‐continuous exercise ( all p <  .005). The current findings indicate the common inclusion criteria of a 12–24 hr time restriction on exercise can be reduced to two hours when performing CVR measures. Furthermore, the consistent nature of the CVR indices throughout the control day indicate reproducible testing sessions can be made between 8:00a.m. and 7:00p.m.

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