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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS 

The Journal of Sports Medicine and Physical Fitness 2003 March;43(1):57-63

Copyright © 2009 EDIZIONI MINERVA MEDICA

lingua: Inglese

Early effects of short-term aerobic training. Physiological responses to graded exercise

Ziemba A. W., Chwalbin`ska-Moneta J., Kaciuba-Uscilko H., Kruk B., Krzeminski K., Cybulski G., Nazar K.

Department of Applied Physiology Medical Research Centre, Polish Academy of Sciences Warsaw, Poland


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Aim. The aim of ­this ­study was to ­find out how ­early the mod­erate ­training ­effects ­appear and to ­check the hypoth­esis ­that famil­iar­iza­tion ­with exer­cise pro­tocol may con­tribute to an ­early phys­io­log­ical ­responses to ­training in pre­vi­ously sed­en­tary sub­jects.
­Methods. ­Twelve ­male, sed­en­tary vol­un­teers (22.0±0.7 yrs) ­were sub­mitted to 3 ­weeks of a ­bicycle ergom­eter ­training, con­sisting of 45 min of exer­cise (at 70% VO2max), 3-4 ­times a ­week. The sub­jects per­formed 4 incre­mental exer­cise ­tests ­until voli­tional exhaus­tion: 2 ­before ­training (C1 and C2), and ­then ­after 1 (T1) and 3 (T3) ­weeks of ­training. ­During exer­cise HR, VO2, ­electrical ­activity (EMG) of ­rectus fem­oris, ­biceps fem­oris, ­soleus and tra­pe­zius mus­cles ­were ­recorded and ­blood sam­ples ­were ­taken for ­blood lac­tate (LA) deter­mi­na­tion.
­Results. ­Already ­after 1 ­week of ­training HR ­decreased (p<0.05) ­with a fur­ther ­decline ­after 3 ­weeks the ­training (p<0.01). Max­imal ­work ­load ­after 3 ­weeks of ­training ­increased to 277±10.4 W vs 250±9.5 W (p<0.05), VO2max ­achieved ­higher ­values ­than in C1 and C2 ­tests (p<0.05) and LA and EMG thresh­olds ­were ele­vated (p<0.05).
Con­clu­sion. A ­decrease in the ­resting and sub­max­imal ­heart ­rate is the ear­liest ­effect of ­increased phys­ical ­activity. Famil­iar­iza­tion to exer­cise pro­tocol ­decreased EMG of ­biceps fem­oris and ­soleus mus­cles ­during exer­cise, but did not influ­ence ­that of ­rectus fem­oris ­muscle the ­most ­engaged ­during ­cycling.

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