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. 2014 Oct;2(5):355–366. doi: 10.1177/2050640614549096

Figure 6.

Figure 6.

Intrabolus pressure (IBP) slope relates to tension generated during muscle contraction that is within the propulsive zone between distension with bolus and tension following occlusion of the lumen. Muscle contraction can be isotonic (lumen closing with no pressure increase), auxotonic (lumen closing with pressure increasing) or isometric (pressure increasing after lumen has closed).