Abstract
We examined the interaction between velocity and progression order on average power and torque production during isokinetic velocity spectrum exercise (lVSE). Twenty-two subjects were assigned randomly to four exercise trials, each containing an isokinetic exercise session involving the dominant knee extensors. Each exercise trial consisted of two sets of 10 repetitions at velocities of 30, 90, 150, and 210 deg/sec (0.52, 1.57, 2.62, and 3.66 rad/sec). Before and after the exercise trials, peak torque (Nm) was assessed and showed no change (training effect) at any of the four velocities. Analysis of the experimental muscle function measurements showed a significant difference for the main effects of protocol for average power (W) and torque (Nm), and for the main effects of velocity for average power and torque. In addition, a significant interaction was found for both average power and torque. Within the velocity spectrum studied, performance of faster velocity contractions before progressing to slower velocities during IVSE is recommended when power or torque production is important.