Heartrate :- Your heart rate is the number of times that your heart beats in a minute.Normal heart rate 75 beat/min.Your body automatically controls your heartbeat to match whatever you're doing or what's happening around you. That's why your heartbeat gets faster when you're active, excited or scared, and drops when you're resting, calm or comfortable.
Your heart rate is an important indicator of your overall health too. When your heart rate is too fast or too slow, that can be a sign of heart or other health problems. The ability to feel your heart rate throughout your body is also a potential way for doctors to diagnose medical conditions.
Your resting heart rate depends on how old you are and your overall health. The younger you are, the higher your heart rate tends to be.
Normal heart rate :-
-The expected resting heart rate ranges for children are:
-Newborns (birth to 4 weeks): 100 - 205 beats bpm*.
-Infant (4 weeks to 1 year): 100 – 180 bpm*.
-Toddler (1 to 3 years): 98 - 140 bpm*.
-Preschool (3 to 5 years): 80 - 120 bpm.
-School-age (5 to 12 years): 75 - 118 bpm.
-Adolescents (13 to 18 years): 60 - 100 bpm.
-For adults (ages 18+), the expected resting heart rate range is 60 - 100 bpm.
*These rates are for children while they’re awake. They will likely be lower when they’re asleep.
About cardiac cycle:- how normally heart beat works
The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next.
-It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole.
-After emptying, the heart immediately relaxes and expands to receive another influx of blood returning from the lungs and other systems of the body, before again contracting to pump blood to the lungs and those systems.
-A normally performing heart must be fully expanded before it can efficiently pump again. Assuming a healthy heart and a typical rate of 70 to 75 beats per minute, each cardiac cycle, or heartbeat, takes about 0.8 second to complete the cycle.
-There are two atrial and two ventricle chambers of the heart; they are paired as the left heart and the right heart—that is, the left atrium with the left ventricle, the right atrium with the right ventricle—and they work in concert to repeat the cardiac cycle continuously, (see cycle diagram at right margin).
-At the start of the cycle, during ventricular diastole–early, the heart relaxes and expands while receiving blood into both ventricles through both atria; then, near the end of ventricular diastole–late, the two atria begin to contract (atrial systole), and each atrium pumps blood into the ventricle below it. During ventricular systole the ventricles are contracting and vigorously pulsing (or ejecting) two separated blood supplies from the heart—one to the lungs and one to all other body organs and systems—while the two atria are relaxed (atrial diastole). This precise coordination ensures that blood is efficiently collected and circulated throughout the body.
ECG :- normally heart rate is recorded by ECG( Electro cardio gram) . By using different electrodes.
1.Uniploar 2.Bipolar
*ECG is recorded by heat sensitive paper.
Thank you
*Nandish.N
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