Heart rate changes during prayer is affected by the level of devotion in prayer and the physical steps of prayer. Heart rate does not necessarily increase after prayer but higher Khushoo’ might result in a higher heart rate after prayer.
From a one-Rakah prayer (Witr) to 11-Rakah prayers (Night prayer with Witr), the heart rate continuously fluctuates to form an interesting twisted map.
AAQIFA ALTAF 