Experimental pain and fatigue induced by excessive chewing

BMC Oral Health

Table 6 Changes compared to baseline in all measures in 40- and 60- min trials in 15 men

	40-min Trial		P-value	60-min Trial		P-value
	Baseline	End^#	P-value	Baseline	End^#	P-value
Fatigue	6 (0)	13 (7)	< 0.001*	6 (0)	17 (4)	< 0.001*
Pain characteristics
Pain Intensity	0 (0)	0 (3.5)	0.85	0 (0)	3 (6)	0.04*
Pain Area	0 (0)	0 (13.75)	0.15	0 (0)	2.00 (301.30)	0.12
Pain Pressure Thresholds
Masseter Muscles	100.00 (0)	99.25 (24.50)	0.17	100.00 (0)	95.25 (42.88)	0.21
Temporal Muscles	100.00 (0)	100.50 (21.00)	1.00	100.00 (0)	86.00 (20.50)	0.15
Index Finger (Reference)	100.00 (0)	96.00 (29.00)	0.22	100.00 (0)	100.00 (45.50)	0.28
Functional Measures
Max Bite Force	100.00 (0)	118.20 (49.60)	0.09	100.00 (0)	96.70 (36.10)	0.58
Max Mouth Opening	100.00 (0)	100.00 (6.20)	0.45	100.00 (0)	97.30 (8.30)	0.23

The subjective fatigue was assessed in Borg’s RPE, the pain intensity (=peak pain) in numeric rating scale (NRS), the pain area in arbitrary units (au), the change in pressure pain threshold in percent (%), the change in maximum voluntary bite force in percent (%) and the change in maximum voluntary mouth opening capacity in percent (%). Data are expressed as median (IQR; interquartile range). P-values refer to the comparisons to baseline data by Friedman’s analysis of variance for repeated measures with Tukey post-hoc test. * = significant difference P < 0.05. #End refers to end of chewing

ISSN: 1472-6831