Knee extension exercise (KEE) has been applied extensively in the rehabilitation programs of patients with various knee disorders.
Because of this specific isolated lumbar extension, exercise often is recommended.
Electromyographic activity of the lumbar and hip extensors during dynamic trunk extension exercise.
These findings raise questions as to the efficacy of added loading and multiple sets during trunk extension exercise.
Objective: To evaluate the effects of exercise intensity and multiple sets on muscle activation patterns during trunk extension exercise.
Resistance Exercise subjects performed leg extension exercise for 8 sets of 5 repetitions at 80% of their individual 1RM, with each set separated by 3 min recovery.
Six healthy men (26 ± 4 years; 176 ± 5 cm; 75.8 ± 11.4 kg) performed a knee extension exercise protocol on two occasions separated by 1 3 weeks.
Main Outcome Measures: Electromyographic activity was recorded from the L3 4 paraspinal region, gluteus maximus, and biceps femoris muscles during multiple sets of trunk extension exercise at intensities representing 40%, 50%, and 70% of peak isometric force.
To determine whether a JNK/SMAD2 signaling axis is activated in response to endurance or hypertrophic stimuli in humans, biopsies were taken from the vastus lateralis muscles of healthy young men at multiple time points before and after completion of a standard bout of acute endurance (cycling) or resistance (weighted leg extension) exercise.
Subjects were then randomized to ride a stationary bicycle, perform lumbar extension exercise, or receive spinal manipulation.
The purpose of this report was to determine if ultrasonography can be useful in evaluating patellar mobility in the superior inferior direction during an isometric knee extension exercise.
