Skip to main content
main-content

11.01.2017 | Original Article | Ausgabe 2/2017

European Journal of Applied Physiology 2/2017

Slower but not faster unilateral fatiguing knee extensions alter contralateral limb performance without impairment of maximal torque output

Zeitschrift:
European Journal of Applied Physiology > Ausgabe 2/2017
Autoren:
Olaf Prieske, Saied J. Aboodarda, José A. Benitez Sierra, David G. Behm, Urs Granacher
Wichtige Hinweise
Communicated by Nicolas Place.

Abstract

Purpose

The purpose of the present study was to examine the effects of unilateral fatigue of the knee extensors at different movement velocities on neuromuscular performance in the fatigued and non-fatigued leg.

Methods

Unilateral fatigue of the knee extensors was induced in 11 healthy young men (23.7 ± 3.8 years) at slower (60°/s; FAT60) and faster movement velocities (240°/s; FAT240) using an isokinetic dynamometer. A resting control (CON) condition was included. The fatigue protocols consisted of five sets of 15 maximal concentric knee extensions using the dominant leg. Before and after fatigue, peak isokinetic torque (PIT) and time to PIT (TTP) of the knee extensors as well as electromyographic (EMG) activity of vastus medialis, vastus lateralis, and biceps femoris muscles were assessed at 60 and 240°/s movement velocities in the fatigued and non-fatigued leg.

Results

In the fatigued leg, significantly greater PIT decrements were observed following FAT60 and FAT240 (11–19%) compared to CON (3–4%, p = .002, d = 2.3). Further, EMG activity increased in vastus lateralis and biceps femoris muscle following FAT240 only (8–28%, 0.018 ≤ p ≤ .024, d = 1.8). In the non-fatigued leg, shorter TTP values were found after the FAT60 protocol (11–15%, p = .023, d = 2.4). No significant changes were found for EMG data in the non-fatigued leg.

Conclusion

The present study revealed that both slower and faster velocity fatiguing contractions failed to show any evidence of cross-over fatigue on PIT. However, unilateral knee extensor fatigue protocols conducted at slower movement velocities (i.e., 60°/s) appear to modulate torque production on the non-fatigued side (evident in shorter TTP values).

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

★ PREMIUM-INHALT
e.Med Interdisziplinär

Mit e.Med Interdisziplinär erhalten Sie Zugang zu allen CME-Fortbildungen und Fachzeitschriften auf SpringerMedizin.de. Zusätzlich können Sie eine Zeitschrift Ihrer Wahl in gedruckter Form beziehen – ohne Aufpreis.

Jetzt e.Med zum Sonderpreis bestellen! 

Weitere Produktempfehlungen anzeigen
Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 2/2017

European Journal of Applied Physiology 2/2017 Zur Ausgabe
  1. Sie können e.Med Allgemeinmedizin 14 Tage kostenlos testen (keine Print-Zeitschrift enthalten). Der Test läuft automatisch und formlos aus. Es kann nur einmal getestet werden.


 

Neu im Fachgebiet Arbeitsmedizin

Bildnachweise