Sinus tachycardia typically occurs as a result of some bodily stress, which causes the heart to beat fast enough to address the body’s increased energy demands. Conditions classically recognized to cause sinus tachycardia are anemia, fever or serious infection, overactive thyroid function, acute blood loss (as in hemorrhage) and dehydration, pulmonary embolism, chronic deconditioning, anxiety, and various medications
https://healthiack.com/health/possible-causes-of-high-pulse-rate
Prolonged increase in resting heart rate may signal health issues
If you get consistent readings of over 100 beats per minute, then you may have tachycardia. Tachycardia is not necessarily a major health problem, but it can render your heart less efficient, which in turn can make you feel dizzy or lightheaded, and sometimes you may even experience fainting and chest pain. This happens due to the fact that there is not enough oxygenated blood in your body.
Conclusion
A temporary increase in heart rate is never alarming. Prolonged increase in heart rate might be a sign that you need to visit a doctor. In many cases you can lower your heart rate zones by following tips above.
https://thefastdiet.co.uk/forums/topic/palpitations-on-a-fasting-day/
“One common side effect of fasting is insomnia. It does not affect everyone, but certainly quite a few.
In shorthand, one reason is because fasting increases norepinephrine levels in the body and one side effect of heightened norepinephrine levels is insomnia. The hormone also increases alertness (‘my mind just wouldn’t stop working’), speeds up the heart rate, pumps glucose into the bloodstream and is the basis of the ‘fight or flight’ response.
Looking back, this makes sense. If in the olden days a person was unsuccessful in their hunt for food and was hungry, it would make sense for the body to become more alert, get more energy and be better able to find and catch something to eat.”
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