Figure 3
Pain distribution during experimental pain in the masseter muscle. Figures showing the pain distribution in the masseter muscle after bilateral injections of hypertonic saline on one side and isotonic saline on the contralateral side in 30 healthy participants (15 women and 15 age-matched men). The red areas show the pain distribution in women and the blue areas indicate the pain spread in men. The pain area was significantly larger after injection of hypertonic saline than control (Mann Whitney U-test; p < 0.05).