Key result
The Trier Social Stress Test increased mean arterial pressure but did not uniformly increase IL-6 levels, with 63% of participants showing an increase and 37% showing a decrease in IL-6.
Why the study?
Does the Trier Social Stress Test increase IL-6 and MAP levels in clinically healthy participants?
Does the Trier Social Stress Test increase IL-6 and MAP levels in clinically healthy participants?
The Trier Social Stress Test induces increases in mean arterial pressure but elicits heterogeneous IL-6 responses, highlighting individual differences in stress-induced inflammatory activity.
Variable IL-6 responses to TSST despite MAP rises caution against uniform inflammatory assumptions; leaves open individual factors in stress research.
Trier Social Stress Test (TSST) is an experimental psychological test that induces changes in autonomic, endocrinological and immunological activity. Two measures used to evaluate the inflammatory activity induced by this test are the interleukin 6 (IL-6), a cytokine sensitive to changes in sympathetic nervous activity, and the mean arterial pressure (MAP), a measure sensitive to changes in autonomic activity. This study had two goals: first, the study examined whether TSST increases IL-6 and MAP levels; second, pre- and post-TSST IL-6 levels were compared for participants whose IL-6 levels increased or decreased due to the TSST. Saliva samples of IL-6 and MAP were taken from 42 participants clinically healthy, without psychiatric history, and data were analysed via quantile comparisons. The results showed that TSST did not lead to an increase in sympathetic activity as indexed by IL-6. Instead, TSST led to increases in MAP. Also, there were significant differences between the IL-6 distributions of people whose IL-6 levels changed from low to high (63%) and from high to low (37%) before and after the TSST. These findings suggest that the TSST will not have the same effect on all participants; that is, individual differences can be assessed using a biomarker to identify people with specialized psychological care needs.
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Medina et al. (2019) studied Clinically healthy (n=42). Trier Social Stress Test (TSST) vs. Pre-TSST baseline was evaluated on Changes in interleukin 6 (IL-6) and mean arterial pressure (MAP) levels. The Trier Social Stress Test increased mean arterial pressure but did not uniformly increase IL-6 levels, with 63% of participants showing an increase and 37% showing a decrease in IL-6.
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