title: Jogging gait kinetics following fatiguing lumbar paraspinal exercise.
abstract: A relationship exists between lumbar paraspinal muscle fatigue and quadriceps muscle activation. The objective of this study was to determine whether hip and knee joint moments during jogging changed following paraspinal fatiguing exercise. Fifty total subjects (25 with self-reported history of low back pain) performed fatiguing, isometric lumbar extension exercise until a shift in EMG median frequency corresponding to a mild level of muscle fatigue was observed. We compared 3-dimensional external joint moments of the hip and knee during jogging before and after lumbar paraspinal fatigue using a 10-camera motion analysis system. Reduced external knee flexion, knee adduction, knee internal rotation and hip external rotation moments and increased external knee extension moments resulted from repetitive lumbar paraspinal fatiguing exercise. Persons with a self-reported history of LBP had larger knee flexion moments than controls during jogging. Neuromuscular changes in the lower extremity occur while resisting knee and hip joint moments following isolated lumbar paraspinal exercise. Persons with a history of LBP seem to rely more heavily on quadriceps activity while jogging.
authors.affiliation: Department of Orthopaedic Surgery, University of Virginia, 400 Ray C. Hunt Drive, Suite 330, Box 800159, Charlottesville, VA 22908-0159, USA. joehart@virginia.edu
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Hart
authors.forename: D Casey
authors.initials: DC
authors.lastname: Kerrigan
authors.forename: Julie M
authors.initials: JM
authors.lastname: Fritz
authors.forename: Ethan N
authors.initials: EN
authors.lastname: Saliba
authors.forename: Bruce
authors.initials: B
authors.lastname: Gansneder
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Ingersoll
mesh_terms: D000328:Adult; D003198:Computer Simulation; D015444:Exercise / Q000502:physiology*; D005260:Female; D005684:Gait; D006621:Hip Joint / Q000503:physiopathology*; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D017116:Low Back Pain / Q000503:physiopathology*; D008159:Lumbar Vertebrae / Q000503:physiopathology*; D008297:Male; D008954:Models, Biological; D009119:Muscle Contraction; D018763:Muscle Fatigue; D018482:Muscle, Skeletal / Q000503:physiopathology*; D012420:Running; D019415:Torque; D055815:Young Adult