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Julio Tous-Fajardo, Rafael A. Maldonado, José M. Quintana, Marco Pozzo and Per A. Tesch

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Gregory M. Gutierrez, Nicole D. Jackson, Kristin A. Dorr, Sarah E. Margiotta and Thomas W. Kaminski


Lateral ankle sprains occur more frequently than any other orthopedic injury. Athletes often report sustaining more injuries late in competition when fatigue is present.


To evaluate neuromuscular function of the ankle musculature after fatigue. Design: Experimental, pretest-posttest.


Research laboratory.


Ten female and 9 male college-aged subjects.


Fatigue was induced via continuous concentric and eccentric muscle actions of the ankle: inversion (INV), eversion (EV), plantar flexion (PF), and dorsiflexion (DF).

Main Outcome Measures:

Peak torque (PT), peak EMG, and median frequency (MF) were calculated prefatigue and postfatigue in the tibialis anterior (TA), peroneus longus (PER), and lateral gastrocnemius (GAS) muscles.


Main effects were noted for test (P < 0.0125) in all statistical tests performed indicating changes in PT, peak EMG, and MF after fatigue.


A significant decrease in MF of the PER muscle after PF fatigue and corresponding with a decreased firing rate, may be of importance, especially with regard to the role in countering the violent moment seen with inversion ankle sprains.

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Ted Polglaze and Matthias W. Hoppe

27846308 17. Ryschon T , Fowler M , Wysong R , Anthony A-R , Balaban R . Efficiency of human skeletal muscle in vivo: comparison of isometric, concentric, and eccentric muscle action . J Appl Physiol . 1997 ; 83 ( 3 ): 867 – 874 . PubMed ID: 9292475 doi:10.1152/jappl.1997

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Jozo Grgic, Filip Sabol, Sandro Venier, Ivan Mikulic, Nenad Bratkovic, Brad J. Schoenfeld, Craig Pickering, David J. Bishop, Zeljko Pedisic and Pavle Mikulic

when the participants could not maintain the prescribed cadence (1–2 s for both concentric and eccentric muscle actions) and/or could not maintain the whole range of motion of the exercise. Following a 5-minute rest, the same procedure was repeated for lower-body muscle strength and muscle endurance

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Mark De Ste Croix, Abigail Priestley, Rhodri Lloyd and Jon Oliver

studies appear to have calculated the H/Q FUNC using functionally relevant procedures ( 4 ). One study exploring the effects of fatigue on concentric and eccentric muscle actions suggest that eccentric torque production is more fatigue resistant than concentric torque production ( 26 ); thus, the H