Author : Changmin Park
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (746 download)
Book Synopsis Inter-limb Differences in Quadriceps Strength and Voluntary Muscle Activation by : Changmin Park
Download or read book Inter-limb Differences in Quadriceps Strength and Voluntary Muscle Activation written by Changmin Park and published by . This book was released on 2011 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Context: Lower extremity neuromuscular assessment is important for detecting possible injury risk and determining return to play criteria following injury. Evaluation of isokinetic strength and voluntary activation testing are both commonly performed to detect inter-limb neuromuscular quadriceps deficits, yet it is unknown if inter-limb deficits in these two measures provide similar information regarding quadriceps function. Objective: Determine if inter-limb deficits differ between measures of isokinetic quadriceps strength and voluntary activation at 30°, 70° and 90° of knee flexion in healthy participants. Secondarily, we sought to determine the relationship between inter-limb deficits in quadriceps strength and voluntary activation. Design: Crossover. Setting: Research laboratory. Participants: Twenty-five participants (11 Males, 14 Females, age=25.08 ±4.67 years, height=172.88±7.74cm, weight=67.04±10.67kg) with no history of knee injury volunteered for the study. Interventions: Independent variables included testing measure (isokinetic strength and voluntary activation) and sex (male and female). The order in which testing measure were performed was randomly assigned. Isokinetic strength was performed at 60°/second through the full range of motion. Voluntary activation was assessed by administering a supramaximal electrical stimulus during a maximal voluntary isometric contraction at each target angle. Main Outcome Measures: Isometric quadriceps strength was determined by extracting torque measurements at 90°of knee flexion, while voluntary activation was measured via the central activation ratio. Inter-limb difference scores for each measure were expressed as an absolute value percentage of the dominant leg ((non-dominant - dominant leg)/ dominant leg). A 2x2 repeated measures analysis of variance was used to determine differences in inter-limb deficits between measures and sex. A Pearson product moment correlation was used to assess the relationship between deficits at each joint angle. An a priori level of significance was set at P
