Caffeine and Stress Response Study

Overview

This project examines how caffeine changes concentration-related physiology in students using wearable measurements before and after intake.

Key Focus

• Study caffeine effects in adolescents with objective physiological signals instead of self-report alone.
• Connect arousal, attention, and wearable biomarkers inside a controlled but realistic workflow.
• Identify which stress-related responses appear consistently and which remain highly individual.

Methodology

• PPG, GSR, and heart-rate-variability signals were collected before and after a moderate caffeine dose.
• Participants completed standardized digital concentration tasks during the experimental sequence.
• Paired comparisons were used to measure physiological change across the same participants.

Key Outcomes

• PPG amplitude showed a clear post-caffeine decrease, indicating measurable vascular change.
• HRV and electrodermal responses revealed shifts in arousal and cognitive effort after intake.
• The results suggest caffeine response is detectable with wearables but still varies meaningfully across individuals.