Abstract
The aim of this study was to investigate the effect of high-intensity plyometric training
(PT) on central and peripheral fatigue during exercise performed at maximal intensity
in prepubertal boys. The boys (n=13, age 10.3±0.3 years) performed continuous 2-min
maximal voluntary contractions (MVC) before and after 16 high-intensity PT sessions
(two training sessions per week, 30 jumps in each session, 20 s between jumps). The
greatest effect of PT was on excitation-contraction coupling: twitch force increased
by 323.2±210.8% and the height of a counter-movement jump increased by 36.7±11.7%,
whereas quadriceps femoris (QF) muscle voluntary activation index, central activation
ratio and MVC did not change significantly after PT. The thickness of QF increased
by 8.8±7.9% after PT. Central fatigue increased significantly by about 15–20% after
PT, whereas peripheral fatigue decreased significantly by about 10% during the 2-min
MVC. Central fatigue and peripheral fatigue during the 2-min MVC were inversely related
before PT, but this relationship disappeared after PT.
Key words
children - electrical stimulation - central and peripheral fatigue - plyometric training
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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: +37/0 37/302 621
Fax: +37/0 37/204 515
Email: kku712@yahoo.com