Frequency components in breath holding experiments

Ata Akin; Uzay E. Emir; Serhan Kalsin; Omer Sayli

doi:10.1117/12.590638

28 April 2005 Frequency components in breath holding experiments

Ata Akin, Uzay E. Emir, Serhan Kalsin, Omer Sayli

Proceedings Volume 5693, Optical Tomography and Spectroscopy of Tissue VI; (2005) https://doi.org/10.1117/12.590638
Event: SPIE BiOS, 2005, San Jose, CA, United States

Abstract

Functional Near Infrared Spectroscopy has been used to investigate changes in cerebral hemodynamics induced by hypercapnia challenges, such as carbon dioxide CO₂ inhalation and breath holding. The aim of this study was to investigate CO₂ pressure changes dependence of frequency spectrum of cerebral hemodynamic oscillations during breath holding task. Measurements of the relative changes in concentration of deoxy-hemoglobin ([Hb]) and oxyhemoglobin ([HbO₂]) are performed on nine healthy subjects during three breath holdings of 30 seconds (s.) interleaved with 90 s. of normal breathing. Power spectra are computed by continuous wavelet transform and averaged for normal and hold episodes. The percent change values between hold and normal episodes are given for frequency peaks at (0.035 Hz), where a 17% higher increase was observed for PC of [Hb] on the right side compared to left side,while this value was at 64.8% for [HbO₂] . Similarly, for a peak at 0.11 Hz these values were 54.5% and 9.5% for [Hb] and [HbO₂] PCs, respectively. The smallest changes were observed for breathing freq. range (around 0.2 Hz) where the values are -72% and 55.8% for [Hb] and [HbO₂], respectively.

Citation Download Citation

Ata Akin, Uzay E. Emir, Serhan Kalsin, and Omer Sayli "Frequency components in breath holding experiments", Proc. SPIE 5693, Optical Tomography and Spectroscopy of Tissue VI, (28 April 2005); https://doi.org/10.1117/12.590638

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KEYWORDS

Continuous wavelet transforms

Sensors

Carbon monoxide

Fourier transforms

Hemodynamics

Blood

Carbon dioxide

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