title: Recovery of dynamic muscle function following isokinetic fatigue testing.
abstract: This study was designed to evaluate recovery of dynamic muscle function following muscle fatigue produced by isokinetic testing. Sixteen physically active males (age = 29.2) performed fatigue and recovery tests on an isokinetic dynamometer (KIN-COM 500H). The fatigue test involved concentric contractions of the quadriceps femoris performed until force output fell below 50% MVC for 3 consecutive contractions. This test was repeated 3 times, with 1 minute rest between sets. Recovery of force output was measured during the following 8 minutes. Following post hoc analysis, subjects were grouped into 1 of 3 groups based on their time to recovery of 80% MCV; Recovery immediately following fatigue exercise (Group 1), between 3 and 6 minutes (Group 2), or no recovery during the 8 minute period (Group 3). Analysis revealed a significant decline in peak force between bouts of a three-bout fatigue test for Groups 2 and 3 (p < 0.001), and no decline in Group 1. There was a significant relationship between decline in force output and time to recovery. Thus, subjects developing a greater amount of muscle fatigue took longer to recover following this isokinetic test. It was concluded that an isokinetic fatigue test to 50% MVC, repeated 3 times, is an appropriate fatigue generating protocol for most active males; that recovery time following isokinetic fatigue exercise varies among active males; and recovery may be directly related to decline in force output between bouts of a three-bout fatigue test.
authors.affiliation: Department of Anatomy, Indiana University School of Medicine, National Institute for Fitness and Sport, Indianapolis, USA.
authors.forename: K I
authors.initials: KI
authors.lastname: Schwendner
authors.forename: A E
authors.initials: AE
authors.lastname: Mikesky
authors.forename: J K
authors.initials: JK
authors.lastname: Wigglesworth
authors.forename: D B
authors.initials: DB
authors.lastname: Burr
mesh_terms: D000328:Adult; D016552:Ergometry; D005069:Evaluation Studies as Topic; D006801:Humans; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D012399:Rotation; D013314:Stress, Mechanical; D013848:Thigh; D013997:Time Factors