The Effect of Velocity on Load Range during Isokinetic Hip Abduction and Adduction Exercise
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Author
Gautrey, Charlotte
Watson, Tim
Mitchell, Andrew
Attention
2299/11328
Abstract
The purpose of this study was to quantify the components of acceleration, load range and deceleration through a velocity spectrum during concentric hip abduction and adduction isokinetic exercise, and to investigate the eff ect of load range on peak torque and work done. 16 male healthy subjects performed 3 maximal concentric reciprocal hip abduction and adduction gravity corrected repetitions in a fi xed order at 60, 120, 180, 240, 300, 360 and 420 ° · s − 1 , with a 30 s rest between velocities. Hip abduction and adduction results revealed that load range significantly decreased while acceleration and deceleration ROM signifi cantly increased ( p < 0.05) with each increase in velocity. When the total peak torque data was corrected for load range there was a significant decrease ( p < 0.05) in peak torque at velocities of 300 ° · s − 1 and above, for both hip abduction and adduction. Load range correction also resulted in a signifi cant decrease ( p < 0.05) in work done at velocities of 120 ° · s − 1 and above, for both hip abduction and adduction. The results demonstrate an inverse relationship between isokinetic velocity and load range during concentric hip abduction and adduction, and suggest a need for the clinician to carefully consider velocity selection when performing exercise on an isokinetic device.