in order to determine whether or not the pituitary responsiveness to thyrotrophin-releasing hormone ( trh ) changes during the nyctohemeral cycle , 10 healthy regularly cycling women were given 200 microgram of trh at 02.00 h , 10.00 h and 18.00 h with at least a 32 h interval between each test .
C0032002
pituitary
C0040162
thyrotrophin-releasing hormone