TABLE 1.

Mean descriptive statistics and standard deviations (SDs).

	HR (bpm)	PEP (ms)	RMSSD
Base rest	71.63 (9.64)	129.17 (18.65)	52.48 (31.83)
Perform	157.48 (18.12)	87.58 (20.81)	12.50 (7.76)
Post-rest	87.99 (11.96)	128.63 (19.46)	28.24 (22.70)
Δ Base - Perform	86.35 (19.69)	−40.60(24.08)	−40.34(31.39)
Δ Base - Post	16.45 (11.71)	0.45 (19.39)	−24.60(30.62)
Δ Perform - Post	69.89 (18.74)	−41.05(20.01)	−15.74(22.83)

bpm, beats per minute; HR, heart rate; PEP, pre-ejection period; RMSSD, root mean square differences of successive R-R (heartbeat) intervals.