Moderate-Intensity Aerobic Exercise Induces Ambulatory Hypotension in Young Adults with a Family History of Hypertension

This randomized crossover study aimed to evaluate the effect of a single session of aerobic exercise on 24 h ambulatory blood pressure (BP) and heart rate variability (HRV) in young adults with a family history of hypertension, FHH+ (participant with at least one hypertensive parent). Twenty non-hypertensive individuals (four females, sixteen males, 24.84 ± 4.15 years, 23.97 ± 3.28 kg·m−2) underwent a control (non-exercise) and an experimental (aerobic exercise) session in a randomized order, with a minimum interval of 72 h between them. Baseline anthropometric and metabolic parameters included body fat percentage, abdominal circumference, and blood glucose. The aerobic session consisted of 30 min cycling at 50–60% of heart rate reserve (142 ± 5 bpm; 68 ± 22 W). Twenty-four-hour BP and HRV were assessed by ambulatory monitoring. Two-way repeated-measures ANOVA showed a significant main effect of session (exercise vs. control) for systolic (p = 0.026, η2 = 0.084) and diastolic (p = 0.022, η2 = 0.088) BP, with no session × time (awake vs. asleep) interaction. For HRV indices, there were no significant (p > 0.05) main effects of session, nor any interaction between session and time. In summary, aerobic exercise induced 24 h ambulatory hypotension during both awake and sleep periods in non-hypertensive individuals with FHH+, without altering ambulatory HRV.