Dominance in cardiac parasympathetic activity during real recreational SCUBA diving

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Dominance in cardiac parasympathetic activity during real recreational SCUBA diving

Abstract: It was already established that exposure to hyperbaric conditions induces vagal-depended bradycardia
but Weld study on autonomic nervous system (ANS) activity during self-contained underwater breathing apparatus
(SCUBA) diving is lacking. The aim of the present study was to evaluate ANS modification during real recreational
SCUBA diving using heart rate variability analysis (time-domain, frequency-domain and Poincaré plot) in 10 experienced and volunteers recreational divers. Mean RR, root mean square of successive diVerences of interval (rMSSD), high frequency of spectral analysis and standard deviation 1 of Poincaré Plot increased (P < 0.05) during dive. Low frequency/high frequency ratio decreased during dive (P < 0.05) but increased after (P < 0.05). Recreational SCUBA diving induced a rise in vagal activity and a decrease in cardiac sympathetic activity. Conversely, sympathetic activity increases (P < 0.05) during the recovery.

Keywords: SCUBA diving · Autonomic nervous system ·
Autonomic nervous system · Fast Fourier Transform

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