Table 1.

Characteristics of early and late peaks

I	II	III	IV	V	VI	VII	VIII
				Early peak		Late peak
Subject	H-reflex (ms)	D (cm)	MS (ms)	Lat. (ms)	CD (ms)	Lat. (ms)	CD (ms)
1	16	46	22.8	26	3.2	30.5	7.7
2	21.5	49.5	28.8	32	3.2	35.5	6.7
3	17	45	23.6	26.5	2.9	31.5	7.9
4	16	46.5	22.8	30	7.2	35	12.2
5	22.5	45.5	29.2	35	5.8	40	10.8
6	20	46	26.8	34	7.2	40	13.2
7	24	53	31.8	36	4.2	41	9.2
8	21	51	28.5	33.5	5.0	37	8.5
9	24	46	30.8	33.5	2.7	38	7.2
10	22.5	46.5	29.3	33.5	4.2	38	8.7
11	23	45	29.6	34	4.4	37.5	7.9
12	24	48.5	31.1	34.5	3.4	37.5	6.4
13	19	42.5	25.3	30	4.8	33.5	8.3
14	22.5	45	29.1	34	4.9	40	10.9
15	27	47	33.9	37	3.1	44	10.1
16	26	52	33.6	36	2.4	40.5	6.9
17	15	42	21.2	27	5.8	31.5	10.3
18	18.5	47	25.4	31.5	6.1	38	12.6
19	22	47	28.9	32.5	3.6	37.5	8.6
20	21	42	27.2	32	4.8	34.5	7.3
Mean					4.4 ± 1.5		9.0 ± 2.1

Column II, QH-reflex latency (ms); column III, distance (cm) between the CPN and the FN stimulating electrodes (cathode to cathode); columnIV, monosynaptic latency (MS, ms) resulting from the calculation of the time of arrival of CPN groupIa volley at the Q MN level by taking a conduction velocity of 68m s⁻¹ (=0.1 × Col.III/0.68 + Col.II). Column V, latency (Lat., ms) of the early peak; columnVI, central delay (CD, ms) of the early peak; columnVII, latency (ms) of the late peak; column VIII, central delay (ms) of the late peak.