Week 10: HRV and the Vagus Nerve

This week, I continued analyzing how age may influence the patterns I’ve been observing in my data. After continuing my analysis, noticeable distinctions emerged between age groups when comparing participants aged 29–60 to those aged 15–28.

For the 29–60 age group, the data showed a much more consistent and linear relationship across the variables I’ve been tracking. Over time, participants in the music condition displayed gradual and predictable changes. Their physiological responses appeared to stabilize and align in a way that suggests a stronger correlation to and more uniform reaction to auditory stimuli.

One key factor that may explain this trend is changes in heart rate reactivity (HRV) with age. As we get older, our baseline heart rate responses to stimuli often become less reactive and more regulated. This can result in smoother, more linear patterns in physiological data, which is consistent with what I observed with this group.

Another important factor to consider is the role of the vagus nerve. The vagus nerve is a major part of the parasympathetic nervous system and is responsible for promoting relaxation and recovery after the body encounters a stressor. Increased vagal activity is associated with a calming effect on the body, helping to lower heart rate and stabilize breathing. Individuals with higher HRV reflect stronger vagal tone and are typically able to respond to stress more efficiently and return to a baseline state more quickly. This may explain why the older age group showed more consistent synchronization in response to music. If vagal regulation is more stable and/or effectively engaged in these individuals, it could lead to more uniform physiological responses over time.

In contrast, the 15–28 age group showed a more varied and less predictable pattern. While there were numerous moments of synchronization, the overall data included more fluctuations and appeared to be more susceptible to random changes. One possible explanation is that vagal tone and HRV are more varied in younger individuals.  This could lead to less stable regulation of stress responses, making physiological reactions to music less consistent and more influenced by moment-to-moment changes or external factors. This shift in my findings suggests that age-related differences in autonomic regulation, particularly involving the vagus nerve and heart rate variability, may play a significant role in how individuals respond to auditory stimuli.

I plan to apply more detailed statistical analysis to measure the strength of these correlations and determine whether the differences between age groups are significant. This will help me better understand whether music’s effects on synchronization and stress are universal or more dependent on factors like age, as well as be able to better graphically interpret the data for my presentation.