ABSTRACT
Objective:To study the presentation and changes of trunk flexors and extensors in isokinetic training at different velocities. Methods:From March to September, 2018, 27 health volunteers were enrolled. Their peak torques of trunk flexors and extensors at 30°/s, 60°/s, and 90°/s were collected. Results:The peak torques of trunk flexors and extensors slightly decreased with the increasing of velocities, but no significant difference was found (F < 2.070, P > 0.05). At 30°/s and 60°/s, the peak torque of extensors was higher than that of flexors (t > 3.138, P < 0.01); at 90°/s, no significant difference was found in the peak torque between flexors and extensors (t = -0.946, P > 0.05). The ratios of the peak torque of flexors to extensors were 0.79∶1 both at 30°/s and 60°/s. The peak torque of flexors decreased in the tenth contraction compared with the second contraction at all the angular velocities, however, it was significantly different only at 30°/s (t = 5.159, P < 0.01); meanwhile, the peak torque of extensors increased with significance only at 60°/s (t = -2.142, P < 0.05). Conclusion:At 30°/s and 60°/s, there might be a linear relation between trunk flexors and extensors, and the peak torque ratios of trunk flexors to extensors were approximately the same.