Effect of Power-Type Strength Training on Lumbar Extension and Flexion Velocity

Abstract

The aim of our study was to investigate the effects of 22 weeks of power-type strength training on isometric peak torque (Nm), dynamic peak torque (Nm), and angular peak velocity (deg/s) of lumbar spine flexion and extension. Subjects (n=125) were sedentary, middle-aged volunteers, of whom 25 women and 28 men were classified in the highly trained group and 35 women and 37 men in the low trained group (=moderately trained, low trained, and nontraining control groups). Isometric peak torque, dynamic peak torque, and angular peak velocity of the lumbar spine in flexion and extension were measured before and after the intervention by using an isoresistive dynamometer. The effects of power-type strength training were mainly manifested in the progress of velocity. With a training frequency of at least twice a week, significant increases were observed in peak flexion and extension velocities in both genders, whereas no such changes were found in isometric or dynamic torque. A training frequency of at least twice a week is apparently needed for improved velocity in lumbar spine extension and flexion in middle-aged, sedentary men and women.

Keywords:

• lumbar spine extension
• lumbar spine flexion
• training frequency

This study was supported by a grant from the Social Insurance Institution of Finland.