RT journal article T1 Associations of cardiorespiratory fitness and muscular fitness with plasma levels of endocannabinoids and their analogues in adults with diagnosed depression: SONRIE study A1 Ruiz Muñoz, Manuel A1 Ortega Gómez, Sonia A1 Espinosa Nogales, María del Mar A1 Valmisa Gómez de Lara, Eulalio Juan A1 Rosety Rodríguez, Miguel Ángel A1 España Romero, Vanesa A2 Didáctica de la Educación FísicaPlástica y Musical A2 Neurociencias K1 Cardiorespiratory fitness K1 Cross-sectional study K1 Depression K1 Endocannabinoid system K1 Muscular fitness K1 Physical fitness AB Background: Depression is a leading cause of global disability, affecting approximately 280 million individuals worldwide. Emerging evidence suggests that both physical fitness and endocannabinoids system play significant roles in the pathophysiology and management of depressive disorders.Purpose: To examine the associations between physical fitness, in terms of cardiorespiratory fitness (CRF) and muscular fitness (MF), with plasma levels of endocannabinoids (eCBs) and their analogues, in adults diagnosed with depression.Methods: The study involved 80 adults (ages 25-65) with a psychiatric diagnosis of mild-to-moderate depression based on the International Classification of Diseases 10th Revision (ICD-10) criteria. Physical fitness was assessed through tests measuring CRF (6-Minute Walk Test) and MF (Handgrip, Arm Curl, Chair Stand, Standing Long Jump Test). Fasting plasma levels of eCBs, such as anandamide (AEA) and 2-arachidonoyl glycerol (2-AG), and their analogues were measured using liquid chromatography-tandem mass spectrometry. Linear regression analyses were conducted or the associations between fitness variables and plasma levels of eCBs and their analogues using three models.Results: CRF and jump performance were inversely associated with plasma levels of the eCBs AEA (β range: - 0.302 to - 0.237 for CRF, - 0.315 to - 0.370 for jump; All p < 0.05) and 2-AG (β range: - 0.308 to - 0.326 across all models). eCBs analogues correlated negatively with CRF [2-linoleoylglycerol, 2-oleoylglycerol, docosatetraenoylethanolamide (DEA)] and jump (linoleylethanolamine, stearoylethanolamine, DEA); findings persisted after lean mass normalization.Conclusion: Our findings indicated that higher physical fitness was associated with lower plasma levels of eCBs and their analogues. PB Springer SN 0940-1334 YR 2025 FD 2025 LK http://hdl.handle.net/10498/39839 UL http://hdl.handle.net/10498/39839 LA eng NO Funding for open access publishing: Universidad de Cádiz/CBUAThe SONRIE Study was funded by the Consejería de Salud y Familias, Junta de Andalucía, Spain (PI0068-2018). The funding sources had no involvement in the study design, data collection, analysis, interpretation of data, or the writing of the manuscript. DS Repositorio Institucional de la Universidad de Cádiz RD 09-nov-2026