Cerebrovascular response to an acute bout of low-volume high-intensity interval exercise and recovery in young healthy adults

Figures

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  Figure 1.. Protocol layout of MCAv recordings 1) before HIIT, 2) during HIIT, 3) immediately following HIIT, and 4) 30 min after the HIIT. BL, baseline; H, high intensity; HIIT, high-intensity interval exercise; MCAv, middle cerebral artery blood velocity; post, immediately following HIIT; post30, 30 min after HIIT; R, active recovery.

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  Figure 2.. Response to high-intensity interval exercise (HIIT, n = 24); horizontal dashed line represents baseline value. *Significantly different than baseline (P < 0.005). †Significantly different than minute 3 (MCAv peak). ‡Significantly different than previous high-intensity bout. Middle cerebral artery blood velocity (MCAv, cm·s−1), age-predicted maximal heart rate (HRmax), expired end-tidal carbon dioxide (PETCO2, mmHg, n = 23), respiratory rate (RR, breaths/min, n = 23), mean arterial pressure (MAP, mmHg), and cerebrovascular conductance index (CVCi, MCAv/MAP). CD, cool down; H, high intensity (open dots); post, immediately following HIIT; post30, 30 min after HIIT; R, active recovery.

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  Figure 3.. Cerebrovascular conductance index (CVCi, MCAv/MAP). Horizontal dashed line represents baseline value. High-intensity interval exercise (HIIT) occurred during 0–600 s (10 min). Active cool down occurred between 600 and 720 s (2 min). Passive recovery immediately following HIIT occurred between 720 and 1,020 s (5 min). CD, cool down; H, high intensity; MAP, mean arterial pressure; MCAv, middle cerebral artery blood velocity; post, immediately following HIIT; R, active recovery.

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  Figure 4.. Absolute middle cerebral artery blood velocity (MCAv) response to high-intensity interval exercise (left) compared with the relative percent change in MCAv response (right). *Significantly different between men (n = 12) and women (n = 12). Horizontal dashed line represents baseline value. BL, baseline; CD, cool down; H, high intensity; post, immediately following HIIT; post30, 30 min after HIIT; R, active recovery.