Publisher Summary It is questionable which are the best indices of emotional response and whether work that employs one parameter can be compared with studies using a different parameter. In the experiment described in the chapter, several parameters were used, such as plasma 1,1-hydroxycorticosteroid concentrations, blood pressure, pulse rate, and urinary catecholamine excretion rates. The intercorrelations between those parameters were investigated. The volunteers used in the present experiments were male medical students, aged about 20 years, taking the second M.B. anatomy oral examination. A university oral examination is suitable for the investigation of the effects of stress because it is a realistic situation in which the subject's future is involved. There is a highly significant increase in pulse rate, blood pressure, plasma 1,1-hydroxycorticosteroids, and urinary adrenaline and noradrenaline excretion. The degree of concordance among these various parameters is low and there are several possible explanations for this. A physique with a high muscular component appears to be associated with a smaller plasma 1,1-hydroxycorticosteroid rise and a greater noradrenaline excretion rate in response to emotional stress than those with a different kind of body build. The mechanisms responsible for these particular associations between body build and the degree of plasma 1,1-hydroxy- corticosteroid and urinary noradrenaline responses to stress have not been evaluated.