| Cerebral and muscle deoxygenation, hypoxic ventilatory chemosensitivity and cerebrovascular responsiveness during incremental exercise. | |
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MedLine Citation:
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PMID: 19729079 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To examine if cerebral (frontal cortex) and skeletal muscle (m. vastus lateralis) deoxygenation and cerebral blood flow velocity (V(mean)) in the middle cerebral artery differentiated between normoxic and hypoxic (end-tidal P(O)(2) 71 mmHg) conditions, and if they were associated with hypoxic ventilatory chemosensitivity and cerebrovascular responsiveness, 8 men performed incremental cycling trials (30W/min ramp) under normoxic (T1-N) and hypoxic (T1-H) conditions until volitional fatigue, or until arterial O2 saturation decreased below 80%. The tests were repeated (T2-N; T2-H) on another day with supplemental O2 (Sup-O2) at the end of exercise. The V(mean) response was similar in normoxia and hypoxia. In hypoxia compared to normoxia, cerebral deoxygenation ( upward arrow deoxyhemoglobin concentration (Delta[HHb]) and downward arrow tissue oxygenation index (TOI)) was greater at a given work rate. A strong hypoxic ventilatory chemosensitivity was associated with a rapid reduction of cerebral TOI (r=0.94, P<0.001). Muscle deoxygenation was similar in normoxia and hypoxia suggesting greater muscle blood flow in hypoxia compared to normoxia and thus the existence of control features that match muscle perfusion and O2 delivery tightly with O2 demand during exercise. Sup-O2 reduced both cerebral and muscle deoxygenation, at least transiently. |
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Authors:
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Juha E Peltonen; Donald H Paterson; J Kevin Shoemaker; Darren S Delorey; Gregory R Dumanoir; Robert J Petrella; John M Kowalchuk |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-09-01 |
Journal Detail:
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Title: Respiratory physiology & neurobiology Volume: 169 ISSN: 1878-1519 ISO Abbreviation: Respir Physiol Neurobiol Publication Date: 2009 Oct |
Date Detail:
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Created Date: 2009-10-05 Completed Date: 2009-12-09 Revised Date: 2010-01-26 |
Medline Journal Info:
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Nlm Unique ID: 101140022 Medline TA: Respir Physiol Neurobiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 24-35 Citation Subset: IM |
Affiliation:
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Unit for Sports and Exercise Medicine, Institute of Clinical Medicine, University of Helsinki, Paasikivenkatu 4, 00250 Helsinki, Finland. juha.peltonen@helsinki.fi |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anoxia / pathology*, physiopathology Blood Flow Velocity / physiology Blood Pressure / physiology Cerebral Cortex / blood supply, physiopathology* Cerebrovascular Circulation / physiology* Exercise / physiology* Hemoglobins / metabolism Humans Male Muscle Fatigue / physiology Muscle, Skeletal / blood supply, physiopathology* Oxygen / blood Oxygen Consumption / physiology Pulmonary Ventilation / physiology* Respiratory Function Tests Spectroscopy, Near-Infrared Young Adult |
| Chemical | |
Reg. No./Substance:
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0/Hemoglobins; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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