Two different fatigue protocols and lower extremity motion patterns during a stop-jump task

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Deutscher übersetzter Titel:Zwei verschiedene Ermüdungsprotokolle und Bewegungsmuster der unteren Extremität während einer Stopp-Sprung-Aufgabe
Autor:Quammen, David; Cortes, Nelson; Van Lunen, Bonnie L.; Lucci, Shawn; Ringleb, Stacie I.; Onate, James
Erschienen in:Journal of athletic training
Veröffentlicht:47 (2012), 1, S. 32-41, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Elektronische Ressource (online) Gedruckte Ressource
Sprache:Englisch
ISSN:1062-6050, 0160-8320, 1938-162X
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Erfassungsnummer:PU201203002191
Quelle:BISp

Abstract

Context: Altered neuromuscular control strategies during fatigue probably contribute to the increased incidence of non-contact anterior cruciate ligament injuries in female athletes. Objective: To determine biomechanical differences between 2 fatigue protocols (slow linear oxidative fatigue protocol [SLO-FP] and functional agility short-term fatigue protocol [FAST-FP]) when performing a running-stop-jump task. Design: Controlled laboratory study. Setting: Laboratory. Patients or Other Participants: A convenience sample of 15 female soccer players (age = 19.2 [+ or -] 0.8 years, height = 1.67 [+ or -] 0.05 m, mass = 61.7 [+ or -] 8.1 kg) without injury participated. Intervention(s): Five successful trials of a running-stop-jump task were obtained prefatigue and postfatigue during the 2 protocols. For the SLO-FP, a peak oxygen consumption ([[??]o.sub.2]peak) test was conducted before the fatigue protocol. Five minutes after the conclusion of the [[??]o.sub.2]peak test, participants started the fatigue protocol by performing a 30-minute interval run. The FAST-FP consisted of 4 sets of a functional circuit. Repeated 2 (fatigue protocol) x 2 (time) analyses of variance were conducted to assess differences between the 2 protocols and time (prefatigue, postfatigue). Main Outcome Measure(s): Kinematic and kinetic measures of the hip and knee were obtained at different times while participants performed both protocols during prefatigue and postfatigue. Results: Internal adduction moment at initial contact (IC) was greater during FAST-FP (0.064 [+ or -] 0.09 Nm/kgm) than SLO-FP (0.024 [+ or -] 0.06 Nm/kgm) ([F.sub.1,14] = 5.610, P = .03). At IC, participants had less hip flexion postfatigue (44.7 [degrees] [+ or -] 8.1 [degrees]) than prefatigue (50.1 [degrees] [+ or -] 9.5 [degrees]) ([F.sub.1,14] = 16.229, P = .001). At peak vertical ground reaction force, participants had less hip flexion postfatigue (44.7 [degrees] [+ or -] 8.4 [degrees]) than prefatigue (50.4 [degrees] [+ or -] 10.3 [degrees]) (F1.14 = 17.026, P=.001). At peak vertical ground reaction force, participants had less knee flexion postfatigue (-35.9 [degrees][+ or -] 6.5 [degrees]) than prefatigue (-38.8 [degrees] -+ 5.03 [degrees]) (F1.14 = 11.537, P = .001). Conclusions: Our results demonstrated a more erect landing posture due to a decrease in hip and knee flexion angles in the postfatigue condition. The changes were similar between protocols; however, the FAST-FP was a clinically applicable 5-minute protocol, whereas the SLO-FP lasted approximately 45 minutes. Verf.-Referat