Dear friend, welcome and thanks for entrusting your query here at HCM !
A normal ECG and Normal holter rule out major arrhythmias.
holter continuously checks ECG during all daily activities and catches any abnormal rhythm.
HR of 83 is Ok and tachycardia
can occur from any cause and also on normal activity.
Do not worry.
It is normal report.
If you have no symptoms, nothing is needed.
If you have any symptoms, please write back.
I hope you are fully satisfied with the guidance I gave.
I would be glad to answer any further queries.
Thank you and Good luck !