Kolyva, C and Tachtsidis, I and Ghosh, A and Moroz, T and Cooper, CE and Smith, M and Elwell, CE (2012) 'Systematic investigation of changes in oxidized cerebral cytochrome c oxidase concentration during frontal lobe activation in healthy adults.' Biomedical Optics Express, 3 (10). 2550 - 2566. ISSN 2156-7085

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Abstract

Using transcranial near-infrared spectroscopy (NIRS) to measure changes in the redox state of cerebral cytochrome c oxidase (Δ[oxCCO]) during functional activation in healthy adults is hampered by instrumentation and algorithm issues. This study reports the Δ[oxCCO] response measured in such a setting and investigates possible confounders of this measurement. Continuous frontal lobe NIRS measurements were collected from 11 healthy volunteers during a 6-minute anagram-solving task, using a hybrid optical spectrometer (pHOS) that combines multi-distance frequency and broadband components. Only data sets showing a hemodynamic response consistent with functional activation were interrogated for a Δ[oxCCO] response. Simultaneous systemic monitoring data were also available. Possible influences on the Δ[oxCCO] response were systematically investigated and there was no effect of: 1) wavelength range chosen for fitting the measured attenuation spectra; 2) constant or measured, with the pHOS in real-time, differential pathlength factor; 3) systemic hemodynamic changes during functional activation; 4) changes in optical scattering during functional activation. The Δ[oxCCO] response measured in the presence of functional activation was heterogeneous, with the majority of subjects showing significant increase in oxidation, but others having a decrease. We conclude that the heterogeneity in the Δ[oxCCO] response is physiological and not induced by confounding factors in the measurements. © 2012 Optical Society of America.

Item Type:	Article
Subjects:	Q Science > QH Natural history > QH301 Biology R Medicine > R Medicine (General)
Depositing User:	Jim Jamieson
Date Deposited:	12 Jan 2013 16:36
Last Modified:	01 Aug 2019 21:17
URI:	http://repository.essex.ac.uk/id/eprint/5075

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