Correlation between beta-endorphin/beta-lipotropin-immunoreactivity and cortisol plasma concentrations

Plasma Cortisol and Beta-Endorphin/Beta-Lipotropin-immunoreactivity concentrations were measured in 51 healthy aged subjects. A direct correlation was found between the plasma concentrations of the two hormones. The data suggest that beta-endorphin/beta-lipotropin is not only released during stress but also in resting conditions.