Fig. 4. Mean concentrations of serum cortisol (S-cortisol), plasma epinephrine (P-Epi), plasma norepinephrine (P-NE), serum glucagon (S-glucagon), and serum free fatty acids (S-FFA) (± SD) during the control study (open circles) and after painful electric stimulation of the abdominal skin for 30 min (filled circles). Serum growth hormone (S-GH) data are medians (25th, 75th percentiles). The pain was stimulated at 120–150 min. *P < 0.05, **P < 0.01 between the two studies.