title: Effects of meal ingestion on blood pressure and regional hemodynamic responses after exercise.
abstract: This study investigated the combined effects of consuming a meal during postexercise hypotension (PEH) on hemodynamics. Nine healthy young male subjects performed each of three trials in random order: 1) cycling at 50% of heart rate reserve for 60 min, 2) oral ingestion of a carbohydrate liquid meal (75 g glucose), or 3) carbohydrate ingestion at 40 min after cycling exercise. Blood pressure, heart rate, cardiac output, and blood flow in the superior mesenteric (SMA), brachial, and popliteal arteries were measured continuously before and after each trial. Regional vascular conductance (VC) was calculated as blood flow/mean arterial pressure. Blood pressure decreased relative to baseline values (P < 0.05) after exercise cessation. Blood flow and VC in the calf and arm increased after exercise, whereas blood flow and VC in the SMA did not. Blood pressure did not change after meal ingestion; however, blood flow and VC significantly decreased in the brachial and popliteal arteries and increased in the SMA for 120 min after the meal (P < 0.05). When the meal was ingested during PEH, blood pressure decreased below PEH levels and remained decreased for 40 min before returning to postexercise levels. The sustained increase in blood flow and VC in the limbs after exercise was reduced to baseline resting levels immediately after the meal, postprandial cardiac output was unchanged by the increased blood flow in the SMA, and total VC and SMA VC increased. Healthy young subjects can suppress severe hypotension by vasoconstriction of the limbs even when carbohydrate is ingested during PEH.
authors.affiliation: Department of Health Sciences, Prefectural University of Hiroshima, Hiroshima, Japan yamaoka@pu-hiroshima.ac.jp.
authors.forename: Masako Yamaoka
authors.initials: MY
authors.lastname: Endo
authors.affiliation: Department of Health Sciences, Prefectural University of Hiroshima, Hiroshima, Japan.
authors.forename: Chizuko
authors.initials: C
authors.lastname: Fujihara
authors.affiliation: Department of Health Sciences, Prefectural University of Hiroshima, Hiroshima, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Miura
authors.affiliation: Department of Health Sciences, Prefectural University of Hiroshima, Hiroshima, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kashima
authors.affiliation: Department of Health Sciences, Prefectural University of Hiroshima, Hiroshima, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Fukuba
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology*; D001795:Blood Pressure Determination / Q000379:methods; D001916:Brachial Artery / Q000378:metabolism / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology; D004040:Dietary Carbohydrates / Q000378:metabolism; D004435:Eating / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D007022:Hypotension / Q000378:metabolism / Q000503:physiopathology; D008297:Male; D062407:Meals / Q000502:physiology*; D008638:Mesenteric Arteries / Q000378:metabolism / Q000502:physiology; D011150:Popliteal Artery / Q000378:metabolism / Q000502:physiology; D019518:Postprandial Period / Q000502:physiology; D012039:Regional Blood Flow / Q000502:physiology; D012146:Rest / Q000502:physiology; D014661:Vasoconstriction / Q000502:physiology; D055815:Young Adult
chemical_list: D004040:Dietary Carbohydrates
keywords: blood pressure regulation; hemodynamics; postexercise hypotension; postprandial hypotension