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Preliminary vastus lateralis characterization with time domain near infrared spectroscopy during incremental cycle exercise
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Paper Abstract

Functional near infrared spectroscopy (NIRS) is a widespread non-invasive technique to monitor skeletal muscle metabolism. However, only variation of oxygenated (HHb), deoxygenated (O2Hb), total (tHb) hemoglobin and saturation (SO2) are usually reported. In this study, Time Domain (TD) NIRS approach was exploited to perform a preliminary quantitative characterization of vastus lateralis muscle during incremental exercise. A population of 11 healthy young male subjects performed on a mechanical cycle ergometer an incremental exercise (initial work rate range = 60-96 W, increment = 12-18 W/min) until exhaustion. TD NIRS, heart rate, pulmonary ventilation (VE), O2 uptake (VO2), CO2 output (VCO2), blood lactate concentration ([La]b) and Borg scale were measured during the exercise. From TD NIRS, muscles absolute values of absorption and scattering coefficients were obtained with a homogeneous approach and hemoglobin concentrations and saturation levels were calculated. The time courses of HHb, O2Hb, tHb and SO2 were consistent with previous literature results. A high inter-subject variability was found for both optical properties and hemodynamic concentrations. Further statistical group analysis will be required in order to highlight significant behavior within the population and correlation with physiological parameters.

Paper Details

Date Published: 11 July 2019
PDF: 3 pages
Proc. SPIE 11074, Diffuse Optical Spectroscopy and Imaging VII, 1107424 (11 July 2019); doi: 10.1117/12.2527068
Show Author Affiliations
I. Pirovano, Politecnico di Milano (Italy)
S. Porcelli, CNR, Istituto di Bioimmagini e Fisiologia Molecolare (Italy)
F. Azzarello, Politecnico di Milano (Italy)
R. Re, Politecnico di Milano (Italy)
L. Spinelli, CNR-Istituto di Fotonica e Nanotecnologie (Italy)
D. Contini, Politecnico di Milano (Italy)
M. Marzorati, CNR, Istituto di Bioimmagini e Fisiologia Molecolare (Italy)
A. Torricelli, Politecnico di Milano (Italy)
CNR, Istituto di Fotonica e Nanotecnologie (Italy)


Published in SPIE Proceedings Vol. 11074:
Diffuse Optical Spectroscopy and Imaging VII
Hamid Dehghani; Heidrun Wabnitz, Editor(s)

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