  Stress is a dynamic process that reflects the responses of the brain.
Traditional methods for measuring stress are often time-consuming and
susceptible to recall bias. To address this, we investigated changes in heart
rate (HR) during the Trier Social Stress Test (TSST). Our study incorporated
varying levels of complexity in mental arithmetic problems. Participants' HR
increased during the Mental Arithmetic Task phase compared to baseline and
resting stages, indicating that stress is reflected in HR.
