Viscosity of food boluses affects the axial force in the esophagus

Table 1 Axial force and manometry association

Volume		5 mL	5 mL	5 mL	5 mL	10 mL	10 mL	10 mL	10 mL
Viscosity (Pa•s)		1 m	2 k	6 k	10 k	1 m	2 k	6 k	10 k
Amplitude
8 cm	ρ =	0.84a	0.81a	0.64a	0.38	0.7a	0.52a	0.46a	0.7a
	P =	< 0.001a	< 0.001a	0.001a	0.069	< 0.001a	0.008a	0.02a	< 0.001a
10 cm	ρ =	0.49a	0.68a	0.57a	0.41	0.27	0.08	-0.7	0.26
	P =	0.016a	< 0.001a	0.021a	0.063	0.163	0.695	0.749	0.29
12 cm	ρ =	0.41	0.39	0.48	-0.32	-0.25	-0.06	-0.15	0.27
	P =	0.06	0.058	0.062	0.157	0.244	0.785	0.494	0.255
Duration
8 cm	ρ =	0.36	0.34	0.47a	0.32	0.55a	0.4a	0.58a	0.53a
	P =	0.061	0.08	0.027a	0.133	0.002a	0.048a	0.002a	0.014a
10 cm	ρ =	-0.23	0.17	0.48	0.33	0.34	0.29	0.32	0.25
	P =	0.292	0.433	0.062	0.138	0.075	0.159	0.122	0.307
12 cm	ρ =	-0.32	0.31	-0.28	0	-0.35	0.03	-0.07	-0.25
	P =	0.14	0.136	0.287	0.997	0.104	0.908	0.766	0.293

The association between axial force [6.5 cm proximal to the lower esophageal sphincter (LES)] and manometry recorded 8, 10 and 12 cm proximal to the LES for both duration and amplitude.

^aIndicate a significant association (P < 0.05).