Analysis of heart rate and oxygen uptake kinetics studied by two different pseudo-random binary sequence work rate amplitudes.
Respir Physiol Neurobiol
; 240: 70-80, 2017 06.
Article
em En
| MEDLINE
| ID: mdl-28274780
ABSTRACT
PURPOSE:
The aim of the study was to compare the kinetics responses of heart rate (HR), pulmonary (VËO2pulm) and predicted muscular (VËO2musc) oxygen uptake between two different pseudo-random binary sequence (PRBS) work rate (WR) amplitudes both below anaerobic threshold.METHODS:
Eight healthy individuals performed two PRBS WR protocols implying changes between 30W and 80W and between 30W and 110W. HR and VËO2pulm were measured beat-to-beat and breath-by-breath, respectively. VËO2musc was estimated applying the approach of Hoffmann et al. (Eur J Appl Physiol 113 1745-1754, 2013) considering a circulatory model for venous return and cross-correlation functions (CCF) for the kinetics analysis.RESULTS:
HR and VËO2musc kinetics seem to be independent of WR intensity (p>0.05). VËO2pulm kinetics show prominent differences in the lag of the CCF maximum (39±9s; 31±4s; p<0.05).CONCLUSIONS:
A mean difference of 14W between the PRBS WR amplitudes impacts venous return significantly, while HR and VËO2musc kinetics remain unchanged.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Músculo Esquelético
/
Teste de Esforço
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Frequência Cardíaca
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Pulmão
Tipo de estudo:
Clinical_trials
/
Prognostic_studies
Limite:
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Respir Physiol Neurobiol
Ano de publicação:
2017
Tipo de documento:
Article