Figure 5
Predicted (Pr) vs. measured (Ms) angular excursion from one subject for the 600 μs and 170 μs pulse durations. Applied load was 4.54 kg. Pairs of 50CFT and 12.5VFT testing trains were followed by 13 x 33CFT fatiguing trains (15 sets of 15 contractions for a total of 225 contractions). Row 2 is the linear regression analysis. Both a fixed slope of unity and y-intercept of 0 were used, because this is the ideal relationship between measurement and prediction. Initial force-motion model parameters for the 600 μs and 170 μs pulse durations, respectively, were: A 90 = 1.11 and 1.69 N/ms, K m = 2.75e-01 and 3.60e-01, τ 1 = 57.9 and 31.5 ms, τ 2 = 59.8 ms, τ c = 20 ms, R 0 = 2, a = −3.27e-04 deg-2, b = 4.21e-02 deg-1, V 1 = 1.56 N/deg2, V 2 = 4.98e-02 deg-1, L/I = 22.2 and 5.86 kg-1m-1, F M = 86.3 and 254.7 N. Fatigue model parameters were: τ fat = 95.4 s, α A = −4.02e-07 ms-2, α Km = −7.34e-08 ms-1N-1, α τ1 = 4.17e-05 N-1, β τ1 = 4.60e-05 and 1.53e-04 ms deg-1N-1.