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Bar graphs of the time- and frequency-domain measures of heart rate variability (means ± SE) for the 4 conditions of autonomic blockade averaged over the first 5 min of recovery from exercise. rMSSD, root mean square of successive differences of RR intervals; RMS, root mean square residuals of linearly detrended RR intervals; sqrtLF, square root of low-frequency power; sqrtHF, square root of high-frequency power; sqrtTOTAL, square root of total power; NS, not significant.
