AUTHOR=Balagué Natàlia , González Jacob , Javierre Casimiro , Hristovski Robert , Aragonés Daniel , Álamo Juan , Niño Oscar , Ventura Josep L. 

TITLE=Cardiorespiratory Coordination after Training and Detraining. A Principal Component Analysis Approach

JOURNAL=Frontiers in Physiology

VOLUME=7

YEAR=2016

URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2016.00035

DOI=10.3389/fphys.2016.00035

ISSN=1664-042X

ABSTRACT=<p>Our purpose was to study the effects of different training modalities and detraining on cardiorespiratory coordination (CRC). Thirty-two young males were randomly assigned to four training groups: aerobic (AT), resistance (RT), aerobic plus resistance (AT + RT), and control (C). They were assessed before training, after training (6 weeks) and after detraining (3 weeks) by means of a graded maximal test. A principal component (PC) analysis of selected cardiovascular and cardiorespiratory variables was performed to evaluate CRC. The first PC (PC<sub>1</sub>) coefficient of congruence in the three conditions (before training, after training and after detraining) was compared between groups. Two PCs were identified in 81% of participants before the training period. After this period the number of PCs and the projection of the selected variables onto them changed only in the groups subject to a training programme. The PC<sub>1</sub> coefficient of congruence was significantly lower in the training groups compared with the C group [<italic>H</italic><sub>(3, <italic>N</italic>=32)</sub> = 11.28; <italic>p</italic> = 0.01]. In conclusion, training produced changes in CRC, reflected by the change in the number of PCs and the congruence values of PC<sub>1</sub>. These changes may be more sensitive than the usually explored cardiorespiratory reserve, and they probably precede it.</p>