Table 1.

Motor Unit and Torque Characteristics During 20% MVIC Contractions.

	Female (n = 10)		Male (n = 14)		Significance
	Mean	ICC	Mean	ICC
MU yield	13.4 MUs (9.0 ± )	0.98	27.7 MUs (7.3 ± )	0.91	0.015*
Mean Torque	4.2 Nm (2.1 ± )	0.96	7.7 Nm (2.7 ± )	0.98	0.045*
Normalized Torque	20.1% (1.6 ± )	0.98	20.0% (1.6 ± )	0.97	0.24
Torque CoV	3.4% (1.2 ± )	0.91	2.3% (1.0 ± )	0.89	0.039*
Mean sEMG Amplitude	62.3 μV (21.2 ± )	0.79	94.0 μV (42.9 ± )	0.85	0.03*
Normalized sEMG Amplitude	8.82% (6.5 ± )	0.79	13.51% (6.0 ± )	0.84	0.66
Median Frequency of sEMG	89.9 Hz (21.1 ± )	0.98	93.8 Hz (25.4 ± )	0.85	0.88
MU Discharge Rate	12.7 pps (0.8 ± )	0.72	11.4 pps (1.6 ± )	0.87	0.02*
CoV of ISI	16.2% (2.6 ± )	0.80	17.1% (5.3 ± )	0.87	0.25
Recruitment Threshold	16.6% (3.5 ± )	0.94	12.3% (3.7 ± )	0.81	0.005*
Max p2p MUAP Amplitude	204.3 μV (21.2 ± )	0.91	334.1 μV (165.6 ± )	0.94	0.007*
Mean p2p MUAP Amplitude	163.74 μV (60.70 ± )	0.92	260.37 μV (117.43 ± )	0.95	0.001*
Median MUAP Frequency	97.18 Hz (23.80 ± )	0.92	121.20 Hz (16.67 ± )	0.94	0.008*
Normalized MUAP distribution	18.58% (4.6 ± )	0.96	16.46% (3.8 ± )	0.97	0.55

Abbreviations: Motor unit (MU); Maximum volitional isometric contraction (MVIC); Coefficient of Variation (CoV); Inter-Spike Interval (ISI); peak-to-peak (p2p); Motor unit action potential (MUAP). Statistically significant (< 0.05) p-value (*).