Table 3: Reductions in the Subacromial Space During Maximal Glenohumeral Motion.

For each participant, the 10% increment of each task in which the greatest amount of glenohumeral translation and axial rotation occurred was determined (directions considered separately) (data was interpolated to have an equal number of points across participants for a given activity). The change in the subacromial space was measured over these increments, and reductions ≥ 1 mm were tallied. For measures that met this criterion, the average reduction and standard deviation were quantified.

		n	Scaption avg. reduction (SD) [mm]	n	Propulsion avg. reduction (SD) [mm]	n	Sideways Lean avg. reduction (SD) [mm]	n	Weight-Relief Raise avg. reduction (SD) [mm]
Glenohumeral Translation	Superior	3	2.15 (.97)	4	3.38 (1.53)	3	2.92 (2.43)	6	2.64 (1.49)
	Inferior	0	N/A	6	3.25 (1.38)	0	N/A	2	2.39 (1.37)
	Anterior	0	N/A	0	N/A	0	N/A	1	2.18
	Posterior	3	2.15 (.97)	6	3.10 (.61)	3	3.61 (1.86)	6	3.38 (.99)
Glenohumeral Axial Rotation	Internal	0	N/A	1	4.40	0	N/A	4	1.63 (.42)
	External	2	2.70 (.35)	2	1.91 (.77)	2	2.03 (1.28)	3	2.86 (2.05)