Table 1.

Measures of background muscle activity and responses to perturbation and to TMS

		BGA (μV)	tmsBGA (μV)	SR-on (ms)	SR-term (ms)	tmsSR-on (ms)	tmsSR-term (ms)	SP-term (ms)
Flexor	R-FF	10.3 ± 0.6	14.2 ± 1.4	49.4 ± 6.3	126.1 ± 10.6	76.8 ± 13.4	162.0 ± 16.6	124.8 ± 10.6
	L-FF	10.1 ± 0.9	13.2 ± 1.6	50.7 ± 6.3	122.1 ± 11.8	78.5 ± 14.7	160.1 ± 17.2	130.1 ± 13.5
Extensor	R-FF	9.8 ± 2.5	14.9 ± 3.0	65.9 ± 10.2	154.3 ± 13.3	78.4 ± 14.2	162.8 ± 14.1	133.8 ± 17.3
L-FF	11.1 ± 3.1	15.8 ± 2.7	63.5 ± 12.2	151.8 ± 15.1	79.7 ± 13.7	161.3 ± 12.4	129.3 ± 19.6

The mean (± SE) background muscle activity in the control trials (BGA) and the mean (± SE) muscle activity in the trials with TMS-only (tmsBGA), the mean (± SD) onset (SR-on) and termination (SR-term) time of induced stretch reflex response after the perturbation, the mean (± SD) onset (tmsSR-on) and termination (tmsSR-term) time of the response with TMS, and the mean (± SD) termination time of silent period (SP-term) after TMS. The BGA and tmsBGA were calculated over the same window as the reflex response in each condition (with or without TMS). Note no significant difference between the force fields in each parameter.