Key result
Finger-photoplethysmography measures ln mNPV and PR demonstrated high reliability across sensor positions (α ≥ 0.850) and light intensities (α ≥ 0.985), while ln DC requires fixed light intensity.
Observational (n=12)
Modified normalized pulse volume (mNPV) and pulse rate (PR) derived from finger-photoplethysmography show high reliability across minor differences in sensor position and light intensity.
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ln mNPV and PR demonstrate high reliability across FPPG positions/intensities; supports their use in psychophysiological research while leaving PV/DC conditional on fixed intensity.
Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.
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Matsumura et al. (2017) reported an observational. Finger-photoplethysmography (FPPG) vs. Different sensor positions and light intensities was evaluated on Inter-method reliability (Cronbach's α) across sensor positions and light intensities. Finger-photoplethysmography measures ln mNPV and PR demonstrated high reliability across sensor positions (α ≥ 0.850) and light intensities (α ≥ 0.985), while ln DC requires fixed light intensity.
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