The Effects of Selective Muscle Weakness on Muscle Coordination in the Human Arm

Table 1

Changes in preferred direction and tuning area.

	Muscles
Subjects	BRD	Blm	TRIlong	TRIlat	AD	MD	PD	PECTClav	BIlat	ANC	PRO	SUP	BRA
Preferred direction (Deg)
M1	0	−6	−5	−2	−13	−38	−7	8	−9	−7	−13	5	−12
M2	−6	17	−8	−2	−4	0	−1	2	0	3	2	5	4
M3	−3	−1	−1	−4	2	13	1	−2	−10	4	−18	−5	−8
M4	−4	−12	7	1	−8	12	4	2	−9	−11	−10	−7	−5
M5	−2	3	−8	−8	5	−35	−4	6	3	−2	0	—	6
M6	−2	−2	2	−1	4	11	−1	0	0	−1	1	0	−8
M7	−3	−3	1	1	2	1	1	—	−2	2	−2	—	−16
Tuning area (%)
M1	35	158	−32	−11	431	27	11	76	82	−22	42	−9	−81
M2	106	−12	−26	−43	7	−21	−24	−8	42	−12	9	−83	—
M3	25	106	6	72	−33	111	108	−17	71	−25	−58	18	−99
M5	62	28	59	11	−14	−19	−30	180	96	49	25	—	−1000
M6	76	107	11	−9	19	92	53	21	98	−15	38	−44	−93
M7	36	57	2	−41	−54	23	−8	—	5	77	490	—	−48

. The negative sign of the change in preferred direction indicates clockwise rotation of the direction following injection of lidocaine. Em dash (—) indicates missing measurement.