Fig. 7.

Serum corticosterone was not altered by SD or GH treatment; however, serum IGF-I was reduced by sleep deprivation but was not restored by GH treatment. Serum hormone concentrations were determined by ELISA. A: serum corticosterone concentration was not significantly different among the 4 groups examined. B: serum IGF-I concentration was significantly lower in SD-Veh animals compared with C-Veh animals. A significant difference remained between SD-GH and C-GH animals, indicating that GH treatment did not restore serum IGF-I following SD.