What are the equations in devices that measure the heart rate, oxygen in the blood, sugar level, and blood pressure?

What are the equations in devices that measure the heart
rate, oxygen in the blood, sugar level, and blood pressure?
Write research about the relation between heart rate and
losing weight during exercise.
In addition, we must know what Is the recommended and
acceptable rates during relaxing, running, and exercises.
Most importantly focus on finding the correct equations with tested examples.
747863
41 minutes ago
For example:
The equation for Cardiac output
Cardiac output is a measure of the amount of blood that is pumped out of the heart in one
minute specifically.
HR x SV = Q. Therefore, to calculate Q we must first
establish heart rate (HR) and stroke volume (SV).
(HR) refers to the number of times the heart beats every
minute (bpm).
(SV) refers to the quantity of blood pumped out of the left
ventricle with every heartbeat.

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