Cardiorespiratory fitness associates negatively with arterial stiffness in a cohort of industrial workers followed up for 4 years

Objective Previously, we have found increased carotid-to-femoral pulse wave velocity (cfPWV) among shift workers compared to day workers in industry, and a decline in maximal oxygen uptake (V̇O 2max ) in all 86 workers. Methods Utilizing all available measurements in 2018, 2021, and 2022, this study investigated associations between V̇O 2max and measures of arterial stiffness. Using a mixed model approach, we analyzed the cross-sectional association between all V̇O 2max (outcome) and measures of arterial stiffness (covariates). Results We observed a significant association between V̇O 2max and cfPWV of −1.59 (95% confidence interval [CI], −3.03 to −0.16), and between augmentation pressure (AP) and augmentation index (Aix) of −0.32 (95% CI, −0.58 to −0.06) and −0.12 (95% CI, –0.23 to −0.005), respectively. Conclusions We found a significant negative association between cardiorespiratory fitness and measures of arterial stiffness. The former and present results pose challenges for shift workers' future macrovascular and microvascular health.