Prediction of trapezius muscle activity and shoulder, head, neck, and torso postures during computer use: results of a field study

Table 5 Parameters in each category used in the expanded model predictions of range of amplitude of trapezius muscle activity and range of motion of shoulder, head, neck, and torso postures

Range of Amplitude/Range of Motion	Individual factors (Total = 15)	Job characteristics (Total = 12)	Computer work behaviors (Total = 20)	Psychosocial factors (Total = 17)	Workstation setup (Total = 27)	Health and pain (Total = 6)	Leisure time activities (Total = 6)	Key (p-values)	Mouse (p-values)	Total number of predictors
Shoulder EMG (%MVC)
Right Trapezius¹	10,16	17,25	41	53,59	72					8
Left Trapezius	11	17	29,43	64	69,72,78	98				9
Shoulder Posture (degrees)
Right Abduction	4,12	18	44		69,72,77,87	97				9
Left Abduction	2,9,10,11				69,75,82	93	102			9
Right Flexion	4	21	32	51,62,65	80	93	99,103			10
Left Flexion			29,32,41,43	50,51	69	93	104			9
Right Internal Rotation		24	35	58	72,82,89	95				7
Left Internal Rotation	16	24	41,46	53	72,75,86		103	0.03		9
Head Posture (degrees)
Tilt		19,21,28	47	51,62	83	98	102,104		0.03	10
Flexion	4	18	29,36,41	51	83,92					8
Neck Posture (degrees)
Tilt	4	23,26			74,83		101			6
Flexion	4		29,31	62	70,75	97	100,101,104			10
Torso Posture (degrees)
Tilt	10	24,28	46		70,74,78		102,104	0.03		9
Flexion	3,4,9	18		62	75					6

Numbers in each category correspond to the numbers assigned to each parameter described in Appendix A.

ISSN: 1471-2474