Document Type

Article

Publication Date

2012

Publication Title

Journal of Athletic Training

Volume

47

Issue

1

Pages

32-41

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 ± 0.8 years, height = 1.67± 0.05m, mass = 61.7 + 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 (V˙o2peak) test was conducted before the fatigue protocol. Five minutes after the conclusion of the V˙o2peak 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) × 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 ± 0.09 Nm/kgm) than SLO-FP (0.024±0.06 Nm/kgm) (F1,14 = 5.610, P= .03). At IC, participants had less hip flexion postfatigue (44.7°±8.1°) than prefatigue (50.1°± 9.5°) (F1,14 = 16.229, P= .001). At peak vertical ground reaction force, participants had less hip flexion postfatigue (44.7°± 8.4°) than prefatigue (50.4°± 10.3°) (F1,14 = 17.026, P=.001). At peak vertical ground reaction force, participants had less knee flexion postfatigue (−35.9°± 6.5°) than prefatigue (−38.8°± 5.03°) (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.

Original Publication Citation

Quammen, D., Cortes, N., Van Lunen, B. L., Lucci, S., Ringleb, S. I., & Onate, J. (2012). Two different fatigue protocols and lower extremity motion patterns during a stop-jump task. Journal of Athletic Training, 47(1), 32-41.

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