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Deep breath and PPG signal flattening

Taking a deep breath and then holding it increases intrathoracic pressure (pressure inside the chest cavity), which compresses veins returning blood to the heart causing a temporary decrease in venous return and cardiac output, and in turn, peripheral circulation. The reverse occurs after releasing the breath after a deep inhalation.

Associated Applications

Associated Application Notes

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short, lightweight pinch leads

LEAD115 Lighter Lead Series

New series of unshielded 45 cm electrode leads with thin cable; suitable for facial EMG and other areas where lighter, shorter lead cables are required. Use for female Touchproof connectors to pinch clip connectors—connect electrodes to either a C-series amplifier or an MEC. The pinch connectors are light weight and the lead cable tinsel wire […]

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MEAP and BIOPAC used to quantify rapid changes in cardiovascular state

The new issue of Psychophysiology has a study “Quantifying rapid changes in cardiovascular state with a moving ensemble average” using MEAP for preprocessing/analysis and BIOPAC hardware and software for data collection, display, and storage. The proof of concept study demonstrates a viable method for the adoption of ICG measures across the field of psychophysiology. MEAP (moving ensemble […]

News Citations—fMRI & Temperature, Postpartum Depression, and Fibromyalgia

BIOPAC provides software and hardware that allow for research teams to record and analyze respiration activity in physiological experimentation. Here are a few notable studies covering MRI, ECG, and Laser Doppler Flow measurement. fMRI & Thermal Perception: The neural mechanisms underlying thermal perception (how hot or cold we perceive the temperature to be) have not been fully […]

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