title: Cardiorespiratory Coordination after Training and Detraining. A Principal Component Analysis Approach.
abstract: 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 (PC1) 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 PC1 coefficient of congruence was significantly lower in the training groups compared with the C group [H (3, N=32) = 11.28; p = 0.01]. In conclusion, training produced changes in CRC, reflected by the change in the number of PCs and the congruence values of PC1. These changes may be more sensitive than the usually explored cardiorespiratory reserve, and they probably precede it.
authors.affiliation: Institut Nacional d'Educació Fisica de Catalunya, Department of Health and Applied Sciences, University of Barcelona Barcelona, Spain.
authors.forename: Natàlia
authors.initials: N
authors.lastname: Balagué
authors.affiliation: Institut Nacional d'Educació Fisica de Catalunya, Department of Health and Applied Sciences, University of Barcelona Barcelona, Spain.
authors.forename: Jacob
authors.initials: J
authors.lastname: González
authors.affiliation: Physiological Sciences II, L'Hospitalet de Llobregat, University of Barcelona Barcelona, Spain.
authors.forename: Casimiro
authors.initials: C
authors.lastname: Javierre
authors.affiliation: Faculty of Physical Education, Sport and Health, Ss. Cyril and Methodius University in Skopje Skopje, Macedonia.
authors.forename: Robert
authors.initials: R
authors.lastname: Hristovski
authors.affiliation: Department of Education, Johannes Gutenberg-Universität Mainz Mainz, Germany.
authors.forename: Daniel
authors.initials: D
authors.lastname: Aragonés
authors.affiliation: Physiological Sciences II, L'Hospitalet de Llobregat, University of Barcelona Barcelona, Spain.
authors.forename: Juan
authors.initials: J
authors.lastname: Álamo
authors.affiliation: Physiological Sciences II, L'Hospitalet de Llobregat, University of Barcelona Barcelona, Spain.
authors.forename: Oscar
authors.initials: O
authors.lastname: Niño
authors.affiliation: Physiological Sciences II, L'Hospitalet de Llobregat, University of Barcelona Barcelona, Spain.
authors.forename: Josep L
authors.initials: JL
authors.lastname: Ventura
keywords: cardiorespiratory exercise testing; complex adaptive systems; coordinative variables; physiological variables; principal component analysis; strength variables; training effects