Partial weight support of the arm affects corticomotor selectivity of biceps brachii

Table 3 Mean (SE) values of observed covariate factors and BB MEP amplitude

Observed variable	Low Support		Medium Support		High Support
Observed variable	Flexion	Pronation	Flexion	Pronation	Flexion	Pronation
Pre-trigger activity	0.0415 (0.0010)	0.0303 (0.0009)	0.0361 (0.0010)	0.0254 (0.0008)	0.0311 (0.0010)	0.0169 (0.0007)
Burst onset interval (s)	0.1843 (0.0021)	0.1865 (0.0021)	0.1851 (0.0022)	0.1906 (0.0021)	0.1870 (0.0021)	0.1866 (0.0021)
Stimulus intensity	1.2557 (0.0042)	1.2529 (0.0043)	1.3154 (0.0029)	1.3176 (0.0032)	1.3242 (0.0027)	1.3274 (0.0027)
Task ratio	5.1247 (0.1510)	8.8021 (0.1969)	6.3926 (0.2197)	10.1044 (0.1892)	6.8140 (0.2430)	11.0445 (0.2796)
MEP amplitude	0.3954 (0.0086)	0.2775 (0.0067)	0.3529 (0.0070)	0.2804 (0.0076)	0.3231 (0.0075)	0.1713 (0.0061)

Pre-trigger activity is expressed as a proportion of maximum voluntary contraction. Burst onset interval is expressed in seconds. Stimulus intensity is expressed as a proportion of active motor threshold. Task ratio is an expression of EMG burst amplitude relative to baseline EMG amplitude. Raw MEP amplitudes were rescaled between 0 and 1 within each participant

ISSN: 1743-0003