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Heart rate
Videos
Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute. The heart rate varies according to the body's physical needs, including the need to absorb
A medical monitoring device displaying a normal human heart rate
A medical monitoring device displaying a normal human heart rate
The human heart
The human heart
Autonomic innervation of the heart: Cardioaccelerator and cardioinhibitory areas are components of the paired cardiac centers located in the medulla o
Autonomic innervation of the heart: Cardioaccelerator and cardioinhibitory areas are components of the paired cardiac centers located in the medulla oblongata of the brain. They innervate the heart via sympathetic cardiac nerves that increase cardiac activity and vagus (parasympathetic) nerves that slow cardiac activity.
Effects of parasympathetic and sympathetic stimulation on normal sinus rhythm: The wave of depolarization in a normal sinus rhythm shows a stable rest
Effects of parasympathetic and sympathetic stimulation on normal sinus rhythm: The wave of depolarization in a normal sinus rhythm shows a stable resting HR. Following parasympathetic stimulation, HR slows. Following sympathetic stimulation, HR increases.
Heart rate monitor
Videos
A heart rate monitor is a personal monitoring device that allows one to measure/display heart rate in real time or record the heart rate for later study. It is largely used to gather heart rate data w
Heart rate
…and can be used during exercise when manual measurement would be difficult or impossible (such as when the hands are being used). Various commercial heart rate monitors are also available. Some monitors, used during sport, consist of a chest strap with electrodes. The signal is transmitted to a wrist receiver for…
Smartwatch displaying a reading of 92 beats per minute
Smartwatch displaying a reading of 92 beats per minute
X-ray image of a chest strap (left: frontal view; right: side view). Visible is the circuit board, the antenna for data transfer, the battery and the
X-ray image of a chest strap (left: frontal view; right: side view). Visible is the circuit board, the antenna for data transfer, the battery and the connections to the electrodes in the adjoining belt at picture top and bottom.