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Fluctuation of frequency‐domain heart rate variability (HRV) analysis parameters in perioperative period in patients undergoing laparoscopic radical gastrectomy. (a\e\i\m) are data of 0–4, (b\f\j\n) are data of 6–10, (c\g\k\o) are data of 18–22, (d\h\l\p) are throughout day data. N = 45. *p < .05, **p < .01, ***p < .001, ****p < .0001. The data were represented as mean ± standard error
