title: Impaired jump landing after exercise in recreational and in high-performance athletes.
abstract: The risk of sustaining injuries increases with fatigue. The aim of this study was to analyze the influence of fatigue on dynamic postural control in jump landing and stabilization (ST) in athletes of different levels. In all, 18 high-performance ball sports athletes and 24 recreationally active subjects performed a jump test (JT) before and at 1, 5, 10, 15, and 20 minutes after a 30-minute treadmill run at the individual anaerobic threshold. An overhead ball switch hit during a forward jump triggered indicator lamps on either side of a force plate. After landing on the plate, ST on 1 leg (no light cue) or a second jump sideways (toward a light cue) was required. The ST force integral index was calculated for the ST trials. Dynamic postural control was significantly impaired in jump landing and ST in the first minute after the run: mean difference ± SD: 0.25 ± 0.48 m·s-1 (95% confidence interval: 0.10-0.40 m·s-1, p = 0.043; analysis of variance). No significant group differences were found. Under fatigued conditions, dynamic postural control in jump landing was impaired in an unexpected ST task. Not only recreational but also high-performance athletes were affected. Ball sports athletes could add a training exercise to their workout, which alternates between periods of high effort and neuromuscular training. Resistance to fatigue effects should be checked on a regular basis using JTs.
authors.affiliation: Departments of 1Orthopedics, Trauma Surgery and Spinal Cord Injury; and 2Sports Medicine, Heidelberg University Hospital, Heidelberg, Germany.
authors.forename: Benita
authors.initials: B
authors.lastname: Kuni
authors.forename: Eloy
authors.initials: E
authors.lastname: Cárdenas-Montemayor
authors.forename: Yannic
authors.initials: Y
authors.lastname: Bangert
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Rupp
authors.forename: Janez
authors.initials: J
authors.lastname: Ales
authors.forename: Birgit
authors.initials: B
authors.lastname: Friedmann-Bette
authors.forename: Holger
authors.initials: H
authors.lastname: Schmitt
mesh_terms: D000293:Adolescent; D000328:Adult; D056352:Athletes / Q000145:classification; D001696:Biomechanical Phenomena; D005080:Exercise Test; D005221:Fatigue / Q000503:physiopathology*; D005260:Female; D006801:Humans; D008297:Male; D009068:Movement / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D012420:Running / Q000502:physiology; D055815:Young Adult