The heart is not located either in the center of their chest or exactly on the left side of the chest. Although having a big heart is.
Imagine the chest cavity with the heart on the left side.

Is your heart on left or right. There remains some controversy about whether sleeping on your left or right side is better for your heart. A Bigger Heart is Not a Better Heart. If you lie on your right side gravity pulls the heart into the chest cavity rather than against the wall of the rib cage.
Your heart lies between the left and right lungs behind your breastbone and is slightly towards the left. Some sleep experts think that sleeping on your right side could compress your. According to Medical Daily Sleeping on the right side can worsen heartburn.
So when you have left-side heart failure your heart cant pump enough blood to your body. The left ventricle or left chamber of the heart provides most of the hearts pumping power. What you can do is wear your tracker one week on your left arm and the other week on the right one and compare the results.
It lies between the right and left lungs in the middle of the chest and slightly towards the left of the breastbone. It is however tilted slightly to the left. The location of the right heart in the body is explained by Thomas Binder MD FESC.
However sleeping on the left side can put a strain on internal organs like the liver lungs and stomach but also while reducing acid reflux Research shows that sleeping on your left side can ease heartburn but experts arent totally sure why. Lying on the right side creates more space in the chest cavity and reduces pressure on the heart muscles. Place your right palm in the middle of your chest.
In contrast when you are on your left side the heart is pulled to the chest wall and you may feel every irregular beat of your heart. As the heart is in the center of your chest with right-sided sleeping studies show that palpitations become much less noticeable. I have personally worm mine on my left.
The heart is enclosed in the pericardium which is a double layer. The heart itself is only the size of a fist and its exact location is behind the breastbone sternum and slightly to the left of center as you can see in the diagram above. So if you are looking down at your body place your hand right in the center of your chest.
Also important facts are explained about the positions of main arteries. Your heart is in middle of your chest in between your right and left lung. Move your hand a bit to the left and thats the exact location of your heart.
Now move it over a tiny bit towards your left. It might be a shocker for some of you but hearts isnt really located on the left side of your chest. Adding to JohnnyRow point you could also argue that your left arm is nearer your heart so this could make a difference in the blood flow detected in that arm but I am not a doctor.
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