The electrocapillary coupling coefficient, zeta, measures the response of the electrode potential, E, to tangential elastic strain at the surface of an electrode. Using dynamic electro-chemo-mechanical analysis, we study zeta(E) simultaneously with cyclic voltammetry. The study covers extended potential intervals on Au, Pt, and Pd, including the electrosorption of oxygen species and of hydrogen. The magnitude and sign of zeta vary during the scans, and quite generally the graphs of zeta(E) emphasize details which are less obvious or missing in the cyclic voltammograms (CVs). Capacitive processes on the clean electrode surfaces exhibit zeta < 0, whereas capacitive processes on oxygen-covered surfaces are characterized by zeta < 0 on Au but zeta > 0 on Pt and Pd. The findings of zeta < 0 during the initial stages of oxygen species adsorption and zeta > 0 for hydrogen electrosorption agree with the trend that tensile strain makes surfaces more binding for adsorbates. However, the large hysteresis of oxygen electrosorption on all electrodes raises the question: is the exchange current associated with that process sufficient for its measurement by potential response during small cyclic strain?