lil twist
a decrease in resting heart rate
You use a heart rate machine
If your heartbeat speeds up slightly then this is respiratory sinus arrhythmia - this is normal, healthy heart-rate variation and is nothing to worry about. It is an indicator of health.
Heart rate monitor, or Electrocardiogram.
rapid improvement in heart rate
Heart rate monitors are used to monitor heart rate on a longer-time basis. You can buy heart rate monitors between £10-500. You can use them whilst you are exercising so that you avoid the risks of exceeding your maximal heart rate.
A doctor can measure a person's heart rate by putting electrodes on the chest. This is called a electrocardiograph. A person's heart rate can also be taken by their pulse.
The fetal heart rate for a baby, regardless of sex, typically ranges from 120 to 160 beats per minute during the second and third trimesters. There is no scientifically validated method to determine the sex of a fetus based solely on heart rate. While some old wives' tales suggest that a higher heart rate indicates a girl and a lower heart rate indicates a boy, these claims lack empirical support. Therefore, fetal heart rate is not a reliable indicator of whether the baby is a boy or a girl.
A lot of agents can affect heart rate, but let's say... Cocaine (accelerates the heart rate) Adrenaline (accelerates the heart rate) Potassium chloride (reduces it to zero - this is the chemical they use in executions to make the heart stop)
If you are fit, your breathing rateand heart rate arelow. During exercise they rise, but afterwards they return to normal very quickly. This is called they recovery rate and it is a good indicator of exercise.
An EKG
There are many applications for iphones that monitor heart rate. Some use the microphone!