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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Pain. 2015 Apr;156(4):750–759. doi: 10.1097/j.pain.0000000000000110

Figure 2.

Figure 2

NC and CFS subjects received 10 s heat stimuli to each forearm to characterize their heat pain sensitivity at baseline and after handgrip exercises. Heat intensity increased from baseline to target temperature in 6 s and was continued at this level for another 4 s. All subjects rated the heat pain intensity at the end of each stimulus using a VAS (0-10). The experimental pain ratings of 3 trials per arm were averaged

A: Average (SEM) heat pain ratings of 44°C heat stimuli to the forearm were significantly greater in CFS subjects than NC (p = .005). However, within each group there was no statistical difference between experimental pain ratings obtained before and after handgrip exercise (p > .05).

B: Average (SEM) heat pain ratings of 46°C heat stimuli to the forearm were significantly greater in CFS subjects than NC (p = .005). However, experimental pain ratings obtained before and after handgrip exercise were not statistical different within each group (p > .05).