SOLVED: Why does cardiac apical impulse rise with S1 sound?

[Ven0m]

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If S1 indicates closure of the mitral valves, why does the apical impulse rise? Doesn't the heart start contracting (and get smaller in volume)?

However, I get why peripheral arteries rise with S1: because they receive blood during ejection (S1 starts ejection). But I don't know why the apical impulse rises.

 

[Charleybacktoreality]

because you begin systole and Push all that blood from left ventricle to the aorta, Increased pressure in left ventricle i suppose.

 

[Ven0m]

because you begin systole and Push all that blood from left ventricle to the aorta, Increased pressure in left ventricle i suppose.

Found it.
It pushes outward during systole because the "vibration resulting from the heart rotating, moving forward and striking against the chest wall during systole"
https://en.wikipedia.org/wiki/Apex_beat