Measurement of the variability of the skin blood volume using dynamic spectroscopy

Assessing Pain Intensity Using Photoplethysmography Signals in Chronic Myofascial Pain Syndrome

“…HR and RRI are associated with PNS. HF reflects parasympathetic tone, and LF reflects both sympathetic and vagal tone . In this study, HR, RRI, LF, and HF reflected increased parasympathetic tone, and LF/HF reflected decreased sympathetic tone, corroborating previous study findings.…”

“…Nizan et al reported the relationship between the sympathetic nervous system and PPG signal. They showed that PPG pulse wave amplitude (PPGA) was positively related to systolic blood volume, baseline (BL) blood volume was negatively related to systolic blood volume, and PPG period variability represents echocardiographic (ECG) R–R interval (RRI) variability . Recently, PPG‐derived parameters (PPG parameters) were developed and applied in the evaluation of depth of anesthesia and experimental pain stimulation.…”

Use of Heart Rate Variability and Photoplethysmograph‐Derived Parameters as Assessment Signals of Radiofrequency Therapy Efficacy for Chronic Pain

“…HF is affected by vagal parasympathetic activity. LF reflects both sympathetic and vagal activities . From this, we know that the decreases in ANSS and PPGA may be affected by an increase in SNS activity and that a decrease in HR and increases in RRI and HF may be affected by an increase in PNS activity.…”

“…The PPG parameters such as PPG amplitude (PPGA), baseline (BL), pulse–pulse interval (PPI), ANS state (ANSS), and surgical stress index (SSI) were affected by the ANS . BL is inversely related to the blood volume, also referred to as the dc component …”

A Novel System for Measuring Optical Properties in Arterial Blood of Man

“…The guiding principle of this study is based on the fact that indirect knowledge of the intensity of a luminous beam, as well as of the changes that it makes on time and space, can assist in building detection or alteration systems (using, e.g. a commercial lamp) to determine the curvature radius, superficial roughness, internal angles and other parameters of the surface under test (Jacques 1993;Cysewska-Sobuslack 1994;Javidi and Horner 1994;Nitzan et al 1996;Gotshal et al 1997;Zhbankov et al 2000), the radiation detector being an essential part (Gotshal et al 1997;Zhbankov et al 2000). Besides the interaction of the electromagnetic radiation with the tissue structure, a great variety of phenomena can be produced taking advantage of the different technological manufacturing devices.…”