Heart, lungs, and diaphragm during: (a) inhalation; (b) exhalation.

Download scientific diagram | Heart, lungs, and diaphragm during: (a) inhalation; (b) exhalation. Illustration based on magnetic resonance imaging (MRI) of natural chest movement [13]. from publication: Breathing Rate Estimation from Head-Worn Photoplethysmography Sensor Data Using Machine Learning | Breathing rate is considered one of the fundamental vital signs and a highly informative indicator of physiological state. Given that the monitoring of heart activity is less complex than the monitoring of breathing, a variety of algorithms have been developed to estimate | Photoplethysmography, Machine Learning and Motion | ResearchGate, the professional network for scientists.

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During inspiration, the diaphragm and the expansion of the thoracic cavity is in the direction

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During inhalation, the diaphragm moves .