Terry L. Grindstaff, Jay Hertel, James R. Beazell, Eric M. Magrum, Christopher D. Ingersoll
Lumbopelvic joint manipulation has been shown to increase quadriceps force output and activation, but the duration of effect is unknown. It is also unknown whether lower grade joint mobilisations may have a similar effect. Forty-two healthy volunteers were randomly assigned to one of three groups (lumbopelvic joint manipulation, 1 min lumbar passive range of motion, or prone extension on elbows for 3 min). Quadriceps force and activation were measured using the burst-superimposition technique during a seated isometric knee extension task before and at 0, 20, 40, and 60 min following intervention.
Collectively, all groups demonstrated a significant decrease in quadriceps force output without changes in activation at all time intervals following intervention. The group that received a lumbopelvic joint manipulation demonstrated a significant increase in quadriceps force and activation immediately following intervention, but this effect was not present after the 20 min interval.
Manual Therapy, 20 September 2008, online article ahead of print