Using imaging photoplethysmography for heart rate estimation in non-human primates

For humans and for non-human primates heart rate is a reliable indicator of an individual's current physiological state, with applications ranging from health checks to experimental studies of cognitive and emotional state. In humans, changes in the optical properties of the skin tissue correla...

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Bibliographic Details
Published in:PloS one 2018-08, Vol.13 (8), p.e0202581
Main Authors: Unakafov, Anton M, Möller, Sebastian, Kagan, Igor, Gail, Alexander, Treue, Stefan, Wolf, Fred
Format: Article
Language:English
Subjects:
Algorithms
Animal cognition
Animals
Behavior, Animal - physiology
Biology and Life Sciences
Cognitive ability
Electrocardiography
Head
Health aspects
Heart - physiology
Heart rate
Heart Rate - physiology
Humans
Medical examination
Medicine and Health Sciences
Methods
Monkeys
Neurosciences
Optical properties
Optics
Photoplethysmography - methods
Physical Sciences
Physiological aspects
Physiological research
Physiology
Plethysmography
Primates
Primates - physiology
Psychology
Pulse rate
Research and Analysis Methods
Sensors
Signal Processing, Computer-Assisted
Skin
Transplants & implants
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Summary:For humans and for non-human primates heart rate is a reliable indicator of an individual's current physiological state, with applications ranging from health checks to experimental studies of cognitive and emotional state. In humans, changes in the optical properties of the skin tissue correlated with cardiac cycles (imaging photoplethysmogram, iPPG) allow non-contact estimation of heart rate by its proxy, pulse rate. Yet, there is no established simple and non-invasive technique for pulse rate measurements in awake and behaving animals. Using iPPG, we here demonstrate that pulse rate in rhesus monkeys can be accurately estimated from facial videos. We computed iPPGs from eight color facial videos of four awake head-stabilized rhesus monkeys. Pulse rate estimated from iPPGs was in good agreement with reference data from a contact pulse-oximeter: the error of pulse rate estimation was below 5% of the individual average pulse rate in 83% of the epochs; the error was below 10% for 98% of the epochs. We conclude that iPPG allows non-invasive and non-contact estimation of pulse rate in non-human primates, which is useful for physiological studies and can be used toward welfare-assessment of non-human primates in research.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0202581