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| Research article summary (published 29 Apr 2002): |
Simultaneous measurements of cerebral oxygenation changes during brain activation by near-infrared spectroscopy and functional magnetic resonance imaging in healthy young and elderly subjects.
Full Abstract
Near infrared spectroscopy (NIRS) and functional magnetic resonance imaging (fMRI) both allow non-invasive monitoring of cerebral cortical oxygenation responses to various stimuli. To compare these methods in elderly subjects and to determine the effect of age on cortical oxygenation responses, we determined motor-task-related changes in deoxyhemoglobin concentration ([HHb]) over the left motor cortex in six healthy young subjects (age 35 +/- 9 years, mean +/- SD) and five healthy elderly subjects (age 73 +/- 3 years) by NIRS and blood-oxygen-level-dependent (BOLD) fMRI simultaneously. The motor-task consisted of seven cycles of 20-sec periods of contralateral finger-tapping at a rate as fast as possible alternated with 40-sec periods of rest. Time-locked averages over the seven cycles were used for further analysis. Task-related decreases in [HHb] over the motor cortex were measured by NIRS, with maximum changes of -0.83 +/- 0.38 mumol/L (P < 0.01) for the young and -0.32 +/- 0.17 mumol/L (P < 0.05) for the elderly subjects. The BOLD-fMRI signal increased over the cortex volume under investigation with NIRS, with maximum changes of 2.11 +/- 0.72% (P < 0.01) for the young and 1.75 +/- 0.71% (P < 0.01) for the elderly subjects. NIRS and BOLD-fMRI measurements showed good correlation in the young (r = -0.70, r(2) = 0.48, P < 0.001) and elderly subjects (r = -0.82, r(2) = 0.67, P < 0.001). Additionally, NIRS measurements demonstrated age-dependent decreases in task-related cerebral oxygenation responses (P < 0.05), whereas fMRI measurements demonstrated smaller areas of cortical activation in the elderly subjects (P < 0.05). These findings demonstrate that NIRS and fMRI similarly assess cortical oxygenation changes in young subjects and also in elderly subjects. In addition, cortical oxygenation responses to brain activation alter with aging.Copyright 2002 Wiley-Liss, Inc.
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Author information
Author/s: Mehagnoul-Schipper, D Jannet (DJ); van der Kallen, Bas F W (BF); Colier, Willy N J M (WN); van der Sluijs, Marco C (MC); van Erning, Leon J Th O (LJ); Thijssen, Henk O M (HO); Oeseburg, Berend (B); Hoefnagels, Willibrord H L (WH); Jansen, René W M M (RW);
Affiliation: Department of Geriatric Medicine, University Medical Center Nijmegen, 6500 HB Nijmegen, the Netherlands.
Journal and publication information
Publication Type: Journal Article
Journal: Human brain mapping (Hum Brain Mapp), published in United States. (Language: eng)
Reference: 2002-May; vol 16 (issue 1) : pp 14-23
Dates: Created 2002/02/28; Completed 2002/06/21; Revised 2006/11/15;
PMID: 11870923, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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