. 2020 May 14;11:399. doi: 10.3389/fphys.2020.00399

TABLE 2.

Neuromuscular function during recovery as percentage change from end of TT.

Parameter	TT duration (min)	1 min	2 min	4 min	8 min	F_time (DFn, DFd), P, η² F_trial (DFn, DFd), P, η² F_interaction (DFn, DFd), P, η²
MVC force Δ%	3	18 ± 6	23 ± 9**	30 ± 9****	35 ± 9***	F (1.249, 13.74) = 35.50, P < 0.0001, η² = 0.160
	10	25 ± 15	32 ± 16**	39 ± 16****	44 ± 2***	F (1.668, 18.35) = 3.064, P = 0.0786, η² = 0.066
	40	29 ± 14	32 ± 13**	37 ± 16****	44 ± 20***	F (4.202, 46.22) = 0.9511, P = 0.4464, η² = 0.004
MVC RMS⋅M^–1 (VL + VM) Δ%	3	−11 ± 16	−18 ± 15	−17 ± 15	−5 ± 17***	F (1.344, 13.44) = 6.306, P = 0.0189, η² = 0.048
	10	−8 ± 14	−10 ± 12	−13 ± 16	−1 ± 18***	F (1.673, 16.73) = 7.637, P = 0.0061, η² = 0.146
	40	12 ± 20^###$$$	3 ± 18^####$$$	−2 ± 19^####$$$	4 ± 19***^####$$$	F (3.735, 37.35) = 1.700, P = 0.1739, η² = -0.020
Force for SS Δ%	3	82 ± 32	108 ± 46**	106 ± 54	84 ± 46****	F (1.047, 11.51) = 10.28, P = 0.0074, η² = 0.030
	10	70 ± 29^#	79 ± 35*^##	77 ± 38^##	64 ± 40**^##	F (1.449, 15.94) = 4.887, P = 0.0309, η² = 0.056
	40	78 ± 43	81 ± 48	73 ± 50^#	62 ± 51*	F (2.324, 25.57) = 9.647, P = 0.0005, η² = 0.017
Force for PS10 Δ%	3	72 ± 28	101 ± 43**	100 ± 49	79 ± 41***	F (1.066, 11.72) = 11.50, P = 0.0050, η² = 0.039
	10	61 ± 25	70 ± 28*^##	64 ± 32^##	50 ± 31**^##	F (1.573, 17.30) = 13.64, P = 0.0006, η² = 0.125
	40	61 ± 32	65 ± 38^##	56 ± 41^##	49 ± 40^##	F (2.546, 28.01) = 10.01, P = 0.0002, η² = 0.018
Force for PS100 Δ%	3	35 ± 14	44 ± 19**	43 ± 22	35 ± 20***	F (1.071, 11.78) = 4.152, P = 0.0627, η² = 0.015
	10	33 ± 12	35 ± 13^#	33 ± 16^#	28 ± 18*	F (1.581, 17.40) = 2.097, P = 0.1592, η² = 0.023
	40	39 ± 23	38 ± 22	35 ± 25	33 ± 26	F (2.956, 32.51) = 8.615, P = 0.0003, η² = 0.011
FPS10/FPS100 Δ%	3	27 ± 10	39 ± 17**	38 ± 18	31 ± 14*	F (1.116, 12.27) = 15.55, P = 0.0015, η² = 0.047
	10	21 ± 11	25 ± 12^##	23 ± 11^##	16 ± 9***^##	F (1.900, 20.90) = 20.33, P < 0.0001, η² = 0.257
	40	16 ± 13^##	19 ± 13^###	15 ± 13^##	10 ± 14^###	F (3.432, 37.75) = 3.676, P = 0.0165, η² = 0.015
PPA (VL + VM) Δ%	3	1 ± 3	1 ± 6	−3 ± 5**	−8 ± 4**	F (1.648, 16.48) = 20.90, P < 0.0001, η² = 0.279
	10	4 ± 3^##	4 ± 4	0 ± 4**	−4 ± 3*^#	F (1.751, 17.51) = 3.195, P = 0.0711, η² = 0.062
	40	3 ± 2^#	2 ± 5	−1 ± 5	−2 ± 8^#	F (3.335, 33.35) = 4.584, P = 0.0069, η² = 0.031

Values are expressed as percentage change from end of TT (n = 12, except n = 11 for MVC RMS⋅M^–1 VL and PPA VL). MVC, maximal voluntary contraction; RMS, root mean square; M, M-wave; VL, vastus lateralis; VM, vastus medialis; SS, single stimulus; PS10, paired stimuli at 10 Hz; PS100, paired stimuli at 100 Hz; FPS10/FPS100, ratio of force for PS10 vs. PS100; PPA, peak-to-peak amplitude of the M-wave. *Different from previous. ^#Different from 3-min TT. ^$Different from 10-min TT. The number of symbols indicate significance at *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001; ^##P < 0.01; ^###P < 0.001; ^####P < 0.0001; ^$$$P < 0.001.