Abstract:
PURPOSE:To understand the extent different types of acute exercise influence cerebral blood flow during and following exercise in children. METHODS:Eight children (7-11 y; 4 girls) completed 2 conditions: high-intensity interval exercise (HIIE; 6 × 1-min sprints at 90% watt maximum) and moderate-intensity steady-state exercise (MISS; 15 min at 44% watt maximum). Blood velocity in the middle cerebral artery (MCAV) and heart rate were assessed continuously. The partial pressure of end-tidal carbon dioxide and mean arterial pressure were assessed at baseline and following exercise. RESULTS:Percentage of maximum heart rate during HIIE was 82% (4%), compared with 69% (4%) during MISS. MCAV was increased above baseline in MISS after 75 seconds (5.8% [3.9%], P × .004) but was unchanged during HIIE. MCAV was reduced below baseline (-10.7% [4.1%], P × .004) during the sixth sprint of HIIE. In both conditions, MCAV remained below baseline postexercise, but returned to baseline values 30-minute postexercise (P < .001). A postexercise increase in mean arterial pressure was apparent following HIIE and MISS, and persisted 30-minute postexercise. Partial pressure of end-tidal carbon dioxide declined post HIIE (-3.4 mm Hg, P < .05), but not following MISS. CONCLUSION:These preliminary findings show HIIE and MISS elicit differing intracranial vascular responses; however, research is needed to elucidate the implications and underlying regulatory mechanisms of these responses.
journal_name
Pediatr Exerc Scijournal_title
Pediatric exercise scienceauthors
Tallon CM,Simair RG,Koziol AV,Ainslie PN,McManus AMdoi
10.1123/pes.2018-0234subject
Has Abstractpub_date
2019-08-01 00:00:00pages
290-295issue
3eissn
0899-8493issn
1543-2920pii
pes.2018-0234journal_volume
31pub_type
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