caa a22 4500 467942161 CHVBK 20180406153016.0 cr unu---uuuuu 170328e20060701xx s 000 0 eng 10.1007/s00421-006-0222-9 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0222-9 Influence of different respiratory maneuvers on exercise-induced cardiac vagal inhibition [Elektronische Daten] [Ricardo Oliveira, Lauro Vianna, Djalma Ricardo, Marcos de Almeida, Claudio Araújo] Physical exercise inhibits cardiac vagal activity. To study the relationship between heart rate (HR) and respiratory pattern, we applied the 4-s exercise test (4sET) and measured cardiac vagal index (CVI) in 30 healthy subjects who served as their own controls, using the standard plus three additional variations, essentially respiratory, of the original protocol: (a) a maximum inspiratory apnea of 16s, of which 8s were in the pre-exercise phase (4sETinsp); (b) free respiratory pattern (4sETunc); and (c) maximum expiratory apnea of 12s (4sETexp). The respective results were expressed by the following CVIs: CVIinsp, CVIunc and CVIexp. CVI was determined in a continuous digital ECG recording through a specific ratio of two RR interval durations. The results [(mean±SEM)] for the four different maneuvers were as follows: CVI (1.56±0.05), CVIinsp (1.55±0.05), CVIunc (1.63±0.05) and CVIexp (1.37±0.02). ANOVA-Bonferroni significant differences were only found between CVIexp and CVIinsp (P=0.009), CVIunc (P<0.001) and CVI (P=0.003). Dividing our sample in terciles according to CVI values, those with lower CVI, showed an attenuation of biphasic HR response after a 15s maximum inspiratory apnea. We conclude that cardiac vagal reflex seems to be influencing the biphasic HR response modulation after a 12s inspiratory apnea as described in the original protocol of 4sET, and this appears to be the option that best discriminates the cardiac vagal reflex, with less variability in the maneuvers when subjects are divided in terciles. Springer-Verlag, 2006 Autonomic nervous system nationallicence 4-s Exercise test nationallicence Heart rate nationallicence Apnea nationallicence Oliveira Ricardo Universidade Gama Filho, Rio de Janeiro, Brazil aut Vianna Lauro Universidade Gama Filho, Rio de Janeiro, Brazil aut Ricardo Djalma SUPREMA, Juiz de Fora, Brazil aut de Almeida Marcos UNIABEU, Rio de Janeiro, Brazil aut Araújo Claudio Universidade Gama Filho, Rio de Janeiro, Brazil aut European Journal of Applied Physiology Springer-Verlag 97/5(2006-07-01), 607-612 1439-6319 97:5<607 2006 97 421 https://doi.org/10.1007/s00421-006-0222-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0222-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Oliveira Ricardo Universidade Gama Filho, Rio de Janeiro, Brazil aut NATIONALLICENCE 700 1- Vianna Lauro Universidade Gama Filho, Rio de Janeiro, Brazil aut NATIONALLICENCE 700 1- Ricardo Djalma SUPREMA, Juiz de Fora, Brazil aut NATIONALLICENCE 700 1- de Almeida Marcos UNIABEU, Rio de Janeiro, Brazil aut NATIONALLICENCE 700 1- Araújo Claudio Universidade Gama Filho, Rio de Janeiro, Brazil aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/5(2006-07-01), 607-612 1439-6319 97:5<607 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer