Salivary oxytocin levels inversely correlate with social loneliness in older adults, increasing after a multimodal intervention
Background
Loneliness, encompassing both social and emotional dimensions, represents a significant public health challenge with profound implications for physical and mental well-being. It is linked to increased risks for coronary heart disease, stroke, depression, cognitive decline, and mortality. Current interventions often fall short in providing measurable biological markers of efficacy. Building on evidence that oxytocin levels rise during positive social interactions, this study explored whether peripheral oxytocin concentration associates with loneliness and changes following a loneliness-alleviating intervention.
Study Design
An uncontrolled pre-post intervention study involved 62 participants (79% women), all aged 60 or over, recruited from municipal activity centers in Valencia, Spain. The intervention consisted of a 13-week multimodal program (Clinicaltrials.gov identifier: NCT06382181) designed to alleviate loneliness. Researchers collected sociodemographic data and assessed loneliness using the De Jong-Gierveld Loneliness Scale. Saliva samples were taken before and after the program to measure oxytocin concentration. Bivariate analyses examined associations, while the Wilcoxon signed-rank test compared pre- and post-intervention oxytocin levels. Linear regression determined predictors of oxytocin changes.
Results
An increase in salivary oxytocin concentration was observed across the entire sample following the 13-week multimodal intervention. In the sub-sample of individuals reporting loneliness at baseline, oxytocin concentration in saliva correlated significantly and inversely with baseline loneliness: specifically, social loneliness (p=0.003) and total loneliness (p=0.025). This indicates that a more intense perception of loneliness was associated with lower baseline oxytocin levels.
Baseline oxytocin levels showed an inverse correlation with age (p=0.011) and a direct correlation with the level of education (p=0.019). Furthermore, a direct and significant correlation was found between loneliness (emotional, social, and total) and the number of children (p<0.05 for all, though specific p-values for children were not detailed beyond this). These findings suggest a complex interplay between social factors, demographic variables, and oxytocin levels in the context of loneliness.
Key Findings
- Salivary oxytocin concentration increased across the entire sample after a 13-week multimodal intervention.
- Baseline salivary oxytocin inversely correlated with social loneliness (p=0.003) and total loneliness (p=0.025) in lonely individuals.
- Lower baseline oxytocin levels were associated with a more intense perception of loneliness.
- Baseline oxytocin inversely correlated with age (p=0.011) and directly correlated with education level (p=0.019).
Why It Matters
This research suggests that salivary oxytocin could serve as a valuable biomarker for assessing the severity of loneliness and monitoring the effectiveness of interventions in older adults. The observed increase in oxytocin after a multimodal program highlights the potential for non-pharmacological approaches to modulate neuroendocrine systems linked to social well-being. For individuals seeking to mitigate loneliness, this study provides biological support for engaging in structured social activities. While a direct protocol for peptide use isn't provided, it underscores the importance of social engagement in potentially influencing endogenous oxytocin, offering a new lens through which to view and address social isolation in aging populations. This could inform future strategies for combining social interventions with potential oxytocin-modulating therapies.
oxytocin
loneliness
older-adults
social-health
biomarker
preclinical-human