tokens: Maximum baroreceptor activity measured at 140 mm Hg and the slope of the pressure - activity curve were reduced in atherosclerotic ( n = 15 ) compared with normal ( n = 13 ) rabbits ( 425 + / - 34 versus 721 + / - 30 spikes per second and 6 . 2 + / - 0 . 6 versus 10 . 8 + / - 0 . 8 spikes per second per mm Hg , respectively , P < . 05 ) .