 The heart rate variability and emotion regulation, HRVER, study tested the effects of HRV biofeedback on young and older adults. The study included baseline measurements of brain activity using functional MI, FMI, as well as physiological measures such as blood pressure, pulse, respiration, and end-tidal CO2. Participants were randomly assigned to either increase or decrease their heart rate oscillation levels over five weeks. After this period, participants underwent additional FMI scans, as well as psychological assessments and plasma sample collection. The results showed that HRV biofeedback had no effect on brain activity, but did improve sleep quality and reduce stress levels. Additionally, the study found that HRV biofeedback may be beneficial for reducing amyloid and tau levels in the brain. This article was authored by Hume Juyo, Kairi Nishiro, Jung One Minute, and others.