Research perspective · 2 October 2026
Cortisol signalling depends on tissue and context
Why a local hormone increase can accompany an improvement.
What the research found
A mouse experiment reported increased lung 11β-HSD1 expression alongside reduced obesity-associated pulmonary inflammation after exercise training. This review uses the indexed publication summary.
What it does not establish
It does not establish lasting systemic cortisol excess or that exercise is harmful. Local glucocorticoid activity and clinical outcomes cannot be inferred from a single circulating measurement.
A research question for EPK
EPK should test the direction of functional outcomes rather than assuming every stress-related signal is damaging. Recovery, symptoms and performance belong alongside biomarkers in an intervention evaluation.
Research and guidance
Explore more studies in the research library.
Related working papers
Read the relevant PDFs: EPK–001 to 007 are the revised version 1.2 papers; EPK–008 to 010 are version 1.0 supplements. Earlier PDFs and DOI records remain on the paper archive.