Increased thermogenic responsiveness to intravenous beta-adrenergic stimulation in habitually exercising humans is not related to skeletal muscle beta2-adrenergic receptor density.
Stob NR, Seals DR, Jørgen J, van Baak MA, Steig AJ, Lindstrom RC, Bikman BT, Bell C. Increased thermogenic responsiveness to intravenous beta-adrenergic stimulation in habitually exercising humans is not related to skeletal muscle beta2-adrenergic receptor density. Exp Physiol. 2007 Sep; 92(5):823-30.