Fig. 3.
Performance-duration relationships for the average per contraction levels of force (A), work (B), and mechanical power (C) in relation to the exhaustive trial durations performed at the 0.6 and 0.3 duty cycle conditions, for a representative subject. Curves were fit in accordance with Eqs. 2 and 3 using measured values of Faer,Waer, Paer, Fmech max, Wmech max and Pmech max for this subject. The performance decrements in force and work occurred with essentially identical time courses due to the experimental design that maintained angular displacement, thus requiring work to vary in response to force. R2 values for the curves illustrated were F0.3 = 0.87, F0.6 = 0.99, W0.3 = 0.85, W0.6 = 0.99, P0.3 = 0.85, and P0.6 = 0.99.