Affiliations: [a] Department of Applied Physiology and Physiotherapy,
Lithuanian Academy of Physical Education, Kaunas,
Lithuania
Note: [] Address for correspondence: Albertas Skurvydas, Department of
Applied Physiology and Physiotherapy, Lithuanian Academy of Physical Education,
Sporto 6, LT-44221, Kaunas, Lithuania. Tel.: +370 7 302620; Fax: +370 7
204515; E-mail: a.skurvydas@lkka.lt
Abstract: The aim of this study was to test the hypothesis that
intraindividual variability in isokinetic knee extension/flexion relates
positively to muscle fatigue, i.e., the less the muscle fatigue during
exercise, the greater is the variability of torque fluctuation. Twelve healthy
males performed 100 continuous knee extensions and flexions with maximal
intensity at 180°/s. The main findings were: 1) the
knee extension muscle exhibited more fatigue and less intraindividual
variability than the knee flexion muscles; 2) intraindividual variability in
knee extension (SD for torque fluctuation in 100 repetitions) relates closely
to fatigue. We conclude that intraindividual variability in isokinetic
knee-extension torque relates inversely to muscle fatigue.
Keywords: Isokinetic knee extension and flexion, muscle fatigue, intraindividual variability
