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The science behind the stress response
Learn how fast nerve signals and slower hormonal responses work together, and what researchers can measure.
Sympathetic & parasympathetic
The autonomic nervous system helps regulate functions such as heart rate. Sympathetic activity supports mobilisation during challenge; parasympathetic activity contributes to regulation and recovery. These branches work dynamically rather than acting as a simple on/off switch.
Heart rate variability (HRV)
HRV describes variation in the time between heartbeats. Researchers study it as an indicator of cardiac autonomic regulation. It can change during stress, but a single reading cannot diagnose anxiety or tell the whole story about someone’s stress.
Cortisol & the HPA axis
The hypothalamic–pituitary–adrenal axis helps coordinate the hormonal stress response, including cortisol release. Cortisol has normal daily rhythms and useful functions. Interpreting a measurement requires context; lower is not automatically better.
Try a 60-second pause
You do not have to feel calm for a pause to be useful. For one minute, stop adding input. Put your phone down. Notice where your body is supported. Let your shoulders soften. Take one comfortable, unforced breath. Then ask: What am I carrying from the last thing into the next thing?
That is enough. The point is interruption, not perfection.
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TreatMyStress is built around a simple rule: useful information should help you understand stress and make informed choices. We explain evidence in plain language, distinguish direct evidence from adjacent research, and say when an idea is plausible but not yet proven.
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