Understand what cortisol does and why a single measurement cannot assess stress. An accessible guide with MedlinePlus sources.
In brief: Cortisol is a hormone produced by the adrenal glands. It helps the body respond to stress and contributes to the regulation of metabolism, blood glucose, inflammation and blood pressure. It is essential for normal bodily function, not a substance to eliminate, and its levels change throughout the day.
A guide to cortisol tests, sample timing and interpretation limits. Why a test is not a universal stress score.
In brief: Cortisol can be measured in blood, saliva or urine. The sample and collection time depend on the clinical question. Tests help investigate hormonal abnormalities: they are not a universal score of daily stress, and a single result cannot identify the cause of an abnormal level on its own.
Stress and relaxation responses: differences, techniques and evidence limitations, based on NCCIH information.
In brief: The relaxation response is a physiological state associated with slower breathing, a reduced heart rate and lower blood pressure. According to NCCIH, it is the opposite of the stress response. Practices that encourage it can support wellbeing, but they do not replace assessment or treatment of a medical condition.
An introduction to comfortable, slow breathing without promises of immediate results or one-size-fits-all protocols.
In brief: Breathing exercises are relaxation practices that bring attention to slow, comfortable breaths. NCCIH includes diaphragmatic breathing among these techniques. You can begin in a quiet setting without forcing your breathing or holding your breath; if you have a health condition, seek guidance from a health professional.