The Effects of Guided Imagery on Heart Rate Variability in Simulated Spaceflight Emergency Tasks Performers

Table 1

Summary of HRV indices in time domain of control group and imagery group with the two techniques.

Time domain HRV	Training techniques	Control group	Imagery group	value of training technique	value of imagery training	value of interaction effect
HR (count/min)	IGI	78.82 ± 3.22	76.60 ± 3.02	0.813	0.106	0.344
	SGI	82.64 ± 3.03	74.30 ± 3.46
RMSDD (ms)	IGI	33.54 ± 2.32	45.10 ± 5.50	0.935	0.002	0.255
	SGI	27.82 ± 2.19	51.70 ± 9.10
SDNN (ms)	IGI	59.03 ± 3.34	83.89 ± 16.08	0.579	0.033	0.623
	SGI	58.45 ± 5.80	74.22 ± 7.64
CV	IGI	0.077 ± 0.004	0.102 ± 0.017	0.564	0.061	0.440
	SGI	0.078 ± 0.007	0.089 ± 0.007
PNN50/%	IGI	12.75 ± 3.02	24.13 ± 4.37	0.962	0.001	0.364
	SGI	8.67 ± 1.83	27.80 ± 6.66

Note: (1) standard errors are shown in parentheses;
(2) IGI was short for instructor-guided imagery, and SGI was short for self-guided imagery.