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. 2017 Aug 16;7:8428. doi: 10.1038/s41598-017-08888-w

Table 1.

Hemodynamic and time domain HRV parameters obtained from the groups of rats injected with atenolol (ATE) and methylatropine (ATR).

BasalATE ATE BasalATR ATR
Mean RR (ms) 165.8 ± 3.2 175.0 ± 4.3* 153.2 ± 2.7 130.3 ± 3.1*
SDNN (ms) 7.1 ± 0.2 3.8 ± 0.6* 6.1 ± 0.4 1.9 ± 0.2*
RMSSD (ms) 4.2 ± 0.3 2.9 ± 0.5* 3.7 ± 0.2 0.9 ± 0.1*

BasalATE: basal period prior to atenolol infusion; BasalATR: basal period prior to methylatropine infusion; RR: RR interval; SDNN: standard deviation of normal intervals; RMSSD: root mean square of successive differences; *different from respective basal. P < 0.05.