Does overnight duty affect vascular endothelial function?

Table 2 Comparison of sleep, fatigue HRV and AI among RHI three groups

Variables	RHI	N	Mean	SD	p value
Sleep duration (h)	Normal	34	4.4	2.2	–
	Critical value	20	4.2	2.4	0.84
	Abnormal	18	4.0	1.9	0.61
VAS scale (%)	Normal	34	46	21	–
	Critical value	20	48	21	0.65
	Abnormal	18	59	13	0.02
CFQ scale	Normal	34	13	6	–
	Critical value	20	12	7	0.35
	Abnormal	18	14	5	0.74
SBP	Normal	34	108	9	–
	Critical value	20	112	10	0.19
	Abnormal	18	114	11	0.07
DBP	Normal	34	64	8	–
	Critical value	20	66	7	0.23
	Abnormal	18	63	5	0.85
HR	Normal	34	68	9	–
	Critical value	20	65	8	0.17
	Abnormal	18	64	6	0.09
SDNN (ms)	Normal	34	46.05	16.14	–
	Critical value	20	52.39	12.41	0.18
	Abnormal	18	54.22	20.41	0.09
rMSSD (ms)	Normal	34	40.84	19.82	–
	Critical value	20	46.49	16.74	0.39
	Abnormal	18	53.77	32.91	0.06
NN50 (ms)	Normal	34	24.74	23.26	–
	Critical value	20	33.00	23.76	0.22
	Abnormal	18	32.72	23.39	0.25
pNN50 (ms)	Normal	34	55.71	280.91	–
	Critical value	20	10.84	8.17	0.57
	Abnormal	18	103.60	395.24	0.55
LF (ms²)	Normal	34	109.69	64.08	–
	Critical value	20	138.01	52.48	0.07
	Abnormal	18	113.23	37.31	0.83
HF (ms²)	Normal	34	180.30	77.14	–
	Critical value	20	187.03	72.97	0.73
	Abnormal	18	179.49	48.35	0.97
LF/HF	Normal	34	0.76	0.62	–
	Critical value	20	1.03	0.94	0.20
	Abnormal	18	0.76	0.70	0.99
AI (%)	Mild	33	− 3.00	11.53	–
	moderate	35	0.68	11.83	0.22
	Severe	5	− 1.60	18.43	0.81
AI@75 bpm (%)	Normal	34	− 5.32	10.24	−
	Critical value	20	− 5.20	14.20	0.97
	Abnormal	18	− 10.83	9.19	0.10

Table shows the correlation between different RHI groups and HRV, sleep, and fatigue. Participants were divided into 3 groups by RHI: normal (< 1.67), critical value (1.67–2.07), and abnormal (≥ 2.07) groups. Data are presented here as mean ± standard deviation
AI, augmentation index; AI@75 bpm, augmentation index adjusted at heart rate 75 bpm; CFQ, Chalder Fatigue Question; DBP, diastolic blood pressure; HF, high frequency; HR, heart rate; HRV, heart rate variability; LF, low frequency; LF/HF, the ratio between low-frequency and high-frequency; N, number; VAS, visual analog scale; NN50, number of N–N differing by more than 50 ms; pNN50, NN50 divided by the total number of N–N intervals; RHI, Reactive hyperemia index; rMSSD, root mean squared standard deviation; SBP, systolic blood pressure; SD, standard deviation; SDNN, standard deviation of normal-to-normal intervals
Statistical analysis was done with ANOVA test and Fisher's LSD test, where p < 0.05 was considered as significant

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