Pain intensity and duration can be enhanced by prior challenge: initial evidence suggestive of a role of microglial priming.
Hains LE, Loram LC, Weiseler JL, Frank MG, Bloss EB, Sholar P, Taylor FR, Harrison JA, Martin TJ, Eisenach JC, Maier SF, Watkins LR. Pain intensity and duration can be enhanced by prior challenge: initial evidence suggestive of a role of microglial priming. J Pain. 2010 Oct; 11(10):1004-14.