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Portable high-end instrument for in-vivo infrared spectroscopy using spread spectrum modulation

Giardini, Mario Ettore and Trevisan, Stefano (2004) Portable high-end instrument for in-vivo infrared spectroscopy using spread spectrum modulation. In: Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference 2004, IMTC 2004. IEEE, pp. 860-863. ISBN 078038248X

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Near infrared spectroscopy (NIRS) can be employed to monitor noninvasively and continuously local changes in hemodynamics and oxygenation of human tissues. In particular, the technique can be particularly useful for muscular functional monitoring during unattended physical activity. A portable NIRS research-grade acquisition system, dedicated to low-noise measurements during muscular exercise, is presented. A spread-spectrum multiplexing scheme significantly enhances system performance. The resulting instrument is compact, lightweight and efficient. Preliminary tests on oxygen consumption during exercise and venous occlusion show excellent detectivity and time response.