Fig. 6.

Relative force error, relative time error, and relative endpoint error for the fast and slow contractions as a function of target force. Each data point corresponds to the mean ± SE for 1 block of 15 trials at each target force for fast (filled circles) and slow (open circles) contractions. a The relative force error was similar for the two contraction speeds and four target forces, and there was no significant interaction between contraction speed and target force. b The relative time error increased with target force for the fast contractions, but not the slow contractions. Furthermore, the fast contractions exhibited significantly greater relative time error compared with the slow speed contractions, especially at higher force levels (speed × force interaction P = 0.001). C. The relative endpoint error was significantly greater for the fast contraction than for the slow contractions (P = 0.001). However, the speed × force interaction was not significant (P = 0.1) despite the greater relative endpoint error for the fast contractions at the higher force levels