Experimental pain and fatigue induced by excessive chewing

BMC Oral Health

Table 2 The table presents the baseline values of fatigue, pain characteristics and functional measures

	All		P-value	40-min		P-value	60-min		P-value
	40-min	60-min		Men	Women		Men	Women
Fatigue	6 (0)	6 (0)	0.88	6 (0)	6 (0)	0.15	6 (0)	6 (0)	0.12
Pain Characteristics
Pain Intensity	0 (0)	0 (0)	1.00	0 (0)	0 (0)	1.00	0 (0)	0 (0)	1.00
Pain Area	0 (0)	0 (0)	0.63	0 (0)	0 (0)	0.45	0 (0)	0 (0)	0.20
Pressure Pain Thresholds
PPT Masseter	165.50 (95.25)	183.75 (111.50)	0.16	214.50 (69.25)	140.38 (28.88)	0.02*	220.00 (116.25)	139.25 (81.06)	0.02*
PPT Temporal	218.75 (109.50)	215.25 (152.00)	0.34	297.50 (69.75)	208.63 (37.19)	0.01*	297.75 (118.50)	186.25 (41.00)	0.01*
PPT Reference	450.25 (184.00)	401.50 (197.30)	0.08	494.75 (316.00)	437.25 (182.69)	0.17	465.25 (331.00)	375.75 (138.44)	0.27
Functional Measures
Max Bite Force	21.30 (14.50)	20.80 (25.30)	0.66	24.20 (32.10)	20.25 (5.88)	0.33	35.90 (26.80)	14.80 (16.18)	0.02*
Max Mouth Opening	55.00 (10.00)	55.00 (10.00)	0.36	60.00 (7.00)	52.00 (8.50)	0.003*	60.00 (6.00)	51.50 (10.50)	0.01*

The subjective fatigue was assessed in Borg’s RPE, the pain intensity in numeric rating scale (NRS), the pain area in arbitrary units (au), the pressure pain threshold in kilo Pascal (kPa), the maximum voluntary bite force in kilogram (kg) and the maximum voluntary mouth opening capacity in millimeters (mm). Data are expressed in median (IQR; interquartile range). P-values refer to the comparisons between trials by Wilcoxon Signed Rank and sexes by Mann-Whitney Rank Sum test. * = significant difference P < 0.005 for subjective fatigue and pain intensity, < 0.013 for pain area after applied Bonferroni Corrections and < 0.05 for the rest of the variables

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