Abstract
Skeletal muscle damage frequently occurs after eccentric exercise, however, the relationship
between intraindividual variability of eccentric exercise and skeletal muscle damage
is not clear yet. The aim of the study was to test the hypothesis that prolonged decrease
in skeletal muscle force depends on intraindividual variability of eccentric exercise.
Eleven healthy men were asked to perform knee eccentric extension of 10 series with
12 repetitions (EE) with maximal intensity at 160 °/s. The maximal voluntary knee
extension isometric torque (MVC) of the quadriceps muscle and isokinetic concentric
torque (IT) at 30 °/s of knee angles were established before and 2 min, 60 min, 24 h
and 14 days after EE. At 24 h and 48 h after EE muscle soreness and creatine kinase
activity before and at 48 h after EE were calculated. The intraindividual variability
of EE and autocorrelation coefficient of EE were calculated. We observed a significant
decrease in MVC and IT after EE. The maximal isokinetic torque shifted to longer muscle
length after EE. It was concluded that longer lasting (within 14 days) indirect symptoms
of exercise induced muscle damage (decrease in muscle force) are closely related to
variability of EE.
Key words
eccentric - concentric and isometric exercise - muscle fatigue and damage - intraindividual
variability - autocorrelation
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Correspondence
Dr. Marius Brazaitis
Lithuanian Academy of Physical Education
Department of Applied Physiology and Physiotherapy
Sporto 6
LT–44221 Kaunas
Lithuania
Phone: +370 37 302 621
Fax: +370 37 204 515
Email: kku712@yahoo.com