Effects of Coffee Versus Hibiscus Tea Consumption During Prolonged Sitting on Blood Pressure and Heart Rate

Modern lifestyles often involve long periods of sitting, which can increase the risk of heart problems, obesity, and other health issues. Diet also plays a key role in heart health. Coffee and hibiscus tea are two common beverages, but their effects during prolonged sitting are not well understood. This study will examine how drinking coffee versus hibiscus tea affects blood pressure, heart rate, and heart rate variability in men and women during extended periods of sitting. Participants (30 in total: 15 women and 15 men) will take part in a randomized crossover study, meaning each person will try both beverages at different times. Data will be collected using questionnaires, body measurements, and devices to measure heart rate, blood pressure, and heart rate variability. The goal is to better understand how these drinks influence heart health during sedentary behavior.

NCT Number	NCT07159152
Lead Sponsor	King Saud University Collaborators: Princess Nourah Bint Abdulrahman University
Conditions	Hypertension
Enrollment	30 participants
Start Date	2025-09-01
Primary Completion	2026-02-01 (estimated)
Study Completion	2026-03-01 (estimated)
Updated on ClinicalTrials.gov	2025-09-08