Figure 4

Measured (Ms) and predicted (Pr) pulse duration (A,C) and load (B,D) dependent reduction in relative angular velocity (A and B±SD) and excursion (C±SD and D) during fatiguing contractions. Angular excursion is defined as the difference between the initial and final knee angle of a leg extension. The 33CFT contractions shown are normalized to the first contraction. Measurements for (B) and (D) were collected in our previous study[16]. Predictions are within one standard deviation of measurements, with the exception of the first 1.5 minutes of the 0 kg load. In (A) and (C) applied load is 4.54 kg and average train durations in (A), from shortest to longest pulse duration, are 0.64, 0.51, 0.36, 0.29, and 0.24 seconds. In (B) and (D) pulse duration is 600 μs and average train durations in (D), from highest load to lowest load, are: 0.89, 0.54, 0.51, 0.32, 0.19 seconds. Maintaining a constant excursion necessitated changing the train duration. Only 2 loads and pulse durations are shown in (B) and (C), respectively, so that the standard deviations could be shown.