Effect of Shallow and Deep SCUBA Dives on Heart Rate Variability.

As the diving depth increased, the sympathetic dynamics showed a trend of concomitant increase.

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During the entire bottom duration, the above noted parasympathetic parameters showed an increasing trend until the 25th min of bottom time and then decreased during the last 5 min segment of the dives albeit this increasing trend was found to be non-significant.

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For two of the depths, 33 and 66 ft., the sympathetic dynamics and LF of PSD during diving were not significantly different when compared to the baseline and did not show a clear trend throughout the bottom time.

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showed a decreasing trend when compared to those at 99 ft.

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