Joel S Burma1,2,3,4,5,6, Alannah Macaulay1,7, Paige V Copeland1, Omeet Khatra8, Kevin J Bouliane1, Jonathan D Smirl1,2,3,4,5,6. 1. Concussion Research Laboratory, Faculty of Health and Exercise Science, University of British Columbia, Kelowna, BC, Canada. 2. Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada. 3. Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada. 4. Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada. 5. Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada. 6. Libin Cardiovascular Institute of Alberta, University of Calgary, AB, Canada. 7. School of Health Sciences, Nuclear Medicine, British Columbia Institute of Technology, Burnaby, BC, Canada. 8. Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada.
Abstract
PURPOSE: Studies examining neurovascular coupling (NVC) require participants to refrain from exercise for 12-24 hours. However, there is a paucity of empirical evidence for this restriction. The objectives for this study were to delineate the time-course recovery of NVC metrics following exercise and establish the NVC within- and between-day reliability. METHODS: Nine participants completed a complex visual search paradigm to assess NVC via transcranial Doppler ultrasound of the posterior cerebral artery blood velocity (PCA). Measurements were performed prior to and throughout the 8-hour recovery period following three randomized conditions: 45 minutes of moderate-intensity exercise (at 50% heart-rate reserve), 30 minutes high-intensity intervals (10, 1-minute intervals at 85% heart-rate reserve), and control (30 minutes quiet rest). In each condition, baseline measures were collected at 8:00am with serial follow-ups at hours zero, one, two, four, six, and eight. RESULTS: Area-under-the-curve and time-to-peak PCA velocity during the visual search were attenuated at hour zero following high-intensity intervals (all p < 0.05); however, these NVC metrics recovered at hour one (all p > 0.13). Conversely, baseline PCA velocity, peak PCA velocity, and the relative percent increase were not different following high-intensity intervals compared to baseline (all p > 0.26). No NVC metrics differed from baseline following both moderate exercise and control conditions (all p > 0.24). The majority of the NVC parameters demonstrated high levels of reliability (intraclass correlation coefficient: >0.90). CONCLUSION: Future NVC assessments can take place a minimum of one hour following exercise. Moreover, all metrics did not change across the control condition, therefore future studies using this methodology can reliably quantify NVC between 8:00am and 7:00 pm.
PURPOSE: Studies examining neurovascular coupling (NVC) require participants to refrain from exercise for 12-24 hours. However, there is a paucity of empirical evidence for this restriction. The objectives for this study were to delineate the time-course recovery of NVC metrics following exercise and establish the NVC within- and between-day reliability. METHODS: Nine participants completed a complex visual search paradigm to assess NVC via transcranial Doppler ultrasound of the posterior cerebral artery blood velocity (PCA). Measurements were performed prior to and throughout the 8-hour recovery period following three randomized conditions: 45 minutes of moderate-intensity exercise (at 50% heart-rate reserve), 30 minutes high-intensity intervals (10, 1-minute intervals at 85% heart-rate reserve), and control (30 minutes quiet rest). In each condition, baseline measures were collected at 8:00am with serial follow-ups at hours zero, one, two, four, six, and eight. RESULTS: Area-under-the-curve and time-to-peak PCA velocity during the visual search were attenuated at hour zero following high-intensity intervals (all p < 0.05); however, these NVC metrics recovered at hour one (all p > 0.13). Conversely, baseline PCA velocity, peak PCA velocity, and the relative percent increase were not different following high-intensity intervals compared to baseline (all p > 0.26). No NVC metrics differed from baseline following both moderate exercise and control conditions (all p > 0.24). The majority of the NVC parameters demonstrated high levels of reliability (intraclass correlation coefficient: >0.90). CONCLUSION: Future NVC assessments can take place a minimum of one hour following exercise. Moreover, all metrics did not change across the control condition, therefore future studies using this methodology can reliably quantify NVC between 8:00am and 7:00 pm.
Authors: Mary E Jung; Jessica E Bourne; Mark R Beauchamp; Emily Robinson; Jonathan P Little Journal: J Diabetes Res Date: 2015-03-30 Impact factor: 4.011
Authors: Joel S Burma; Rowan K Van Roessel; Ibukunoluwa K Oni; Jeff F Dunn; Jonathan D Smirl Journal: J Cereb Blood Flow Metab Date: 2022-02-25 Impact factor: 6.960
Authors: Joel S Burma; Rebecca M Wassmuth; Courtney M Kennedy; Lauren N Miutz; Kailey T Newel; Joseph Carere; Jonathan D Smirl Journal: Physiol Rep Date: 2021-09