Table 5.

Performance metrics for the three fatigue classes (Mean ± STD). Mean calculated over all datapoints from all left-out-subjects.

Category	Best IMU Locations	Level	Sensitivity	Specificity	Precision	F1 Score
Minimally intrusive	L6 (left tibia)	No fatigue	0.774 ± 0.318	0.895 ± 0.151	0.798 ± 0.283	0.774 ± 0.285
		Mild fatigue	0.645 ± 0.387	0.855 ± 0.188	0.703 ± 0.342	0.637 ± 0.343
		Heavy fatigue	0.865 ± 0.179	0.893 ± 0.140	0.836 ± 0.172	0.834 ± 0.146
Quasi-minimally intrusive	L4 L6 (left thigh, left tibia)	No fatigue	0.949 ± 0.105	0.988 ± 0.035	0.979 ± 0.059	0.960 ± 0.063
		Mild fatigue	0.898 ± 0.172	0.879 ± 0.118	0.809 ± 0.166	0.840 ± 0.144
		Heavy fatigue	0.748 ± 0.234	0.931 ± 0.089	0.852 ± 0.168	0.783 ± 0.184
3+ IMUs	L3 L4 L5 L6 (right thigh, left thigh, right tibia, left tibia)	No fatigue	0.973 ± 0.050	0.986 ± 0.039	0.978 ± 0.064	0.974 ± 0.039
		Mild fatigue	0.949 ± 0.069	0.894 ± 0.109	0.843 ± 0.147	0.885 ± 0.085
		Heavy fatigue	0.776 ± 0.273	0.969 ± 0.033	0.931 ± 0.058	0.819 ± 0.188
Whole body	L1 L2 L3 L4 L5 L6 L7 L8	No fatigue	0.999 ± 0.002	0.987 ± 0.035	0.979 ± 0.059	0.988 ± 0.032
		Mild fatigue	0.885 ± 0.116	0.927 ± 0.099	0.881 ± 0.155	0.875 ± 0.113
		Heavy fatigue	0.830 ± 0.192	0.942 ± 0.058	0.879 ± 0.126	0.846 ± 0.144