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European Journal of Applied Physiology
Published in: European Journal of Applied Physiology 12/2012

01-12-2012 | Original Article

Isometric strength training lowers the O2 cost of cycling during moderate-intensity exercise

Authors: Jerzy A. Zoladz, Zbigniew Szkutnik, Joanna Majerczak, Marcin Grandys, Krzysztof Duda, Bruno Grassi

Published in: European Journal of Applied Physiology | Issue 12/2012

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Abstract

The effect of maximal voluntary isometric strength training of knee extensor muscles on pulmonary V′O2 on-kinetics, the O2 cost of cycling and peak oxygen uptake (V′O2peak) in humans was studied. Seven healthy males (mean ± SD, age 22.3 ± 2.0 years, body weight 75.0 ± 9.2 kg, V′O2peak 49.5 ± 3.8 ml kg−1 min−1) performed maximal isometric strength training lasting 7 weeks (4 sessions per week). Force during maximal voluntary contraction (MVC) increased by 15 % (P < 0.001) after 1 week of training, and by 19 % (P < 0.001) after 7 weeks of training. This increase in MVC was accompanied by no significant changes in the time constant of the V′O2 on-kinetics during 6 min of moderate and heavy cycling intensities. Strength training resulted in a significant decrease (by ~7 %; P < 0.02) in the amplitude of the fundamental component of the V′O2 on-kinetics, and therefore in a lower O2 cost of cycling during moderate cycling intensity. The amplitude of the slow component of V′O2 on-kinetics during heavy cycling intensity did not change with training. Training had no effect on the V′O2peak, whereas the maximal power output reached at V′O2peak was slightly but significantly increased (P < 0.05). Isometric strength training rapidly (i.e., after 1 week) decreases the O2 cost of cycling during moderate-intensity exercise, whereas it does not affect the amplitude of the slow component of the V′O2 on-kinetics during heavy-intensity exercise. Isometric strength training can have beneficial effects on performance during endurance events.
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Metadata
Title
Isometric strength training lowers the O2 cost of cycling during moderate-intensity exercise
Authors
Jerzy A. Zoladz
Zbigniew Szkutnik
Joanna Majerczak
Marcin Grandys
Krzysztof Duda
Bruno Grassi
Publication date
01-12-2012
Publisher
Springer-Verlag
Published in
European Journal of Applied Physiology / Issue 12/2012
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-012-2405-x

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