cBRS during Phase IV (increasing BP, A) of the Valsalva maneuver is reduced in middle-aged/older men with low testosterone (n = 10) compared with younger men (n = 6) and middle-aged/older men with normal testosterone (n = 10). There is no difference in cBRS during Phase II (decreasing BP, B) of the Valsalva maneuver between groups. P values reflect the main effect of a one-way ANOVA and post hoc testing. Data are represented as individual data points with means ± SD. BP, blood pressure; BRS, baroreflex sensitivity; cBRS, cardiovagal baroreflex sensitivity; MA/O, middle-aged/older.