TY  - JOUR
PY  - 2022//
TI  - Night shifts in interns: effects of daytime napping on autonomic activity and cognitive function
JO  - Frontiers in public health
A1  - Fan, Jieyi
A1  - Wang, Liang
A1  - Yang, Xiaotian
A1  - Zhang, Xiangbo
A1  - Song, Ziyao
A1  - Wu, Sifan
A1  - Zou, Linru
A1  - Li, Xi
A1  - Zhao, Xingcheng
A1  - Li, Chenfei
A1  - Pan, Yikai
A1  - Tie, Yateng
A1  - Wang, Yongchun
A1  - Luo, Zhengxue
A1  - Sun, Xiqing
SP  - e922716
EP  - e922716
VL  - 10
IS  - 
N2  - OBJECTIVE: Night shifts have adverse cognitive outcomes that might be attenuated by daytime napping. The neurovisceral integration model suggests that resting vagally mediated heart rate variability (vmHRV) is linked with cognitive function. This study investigated the relationship between resting vmHRV and cognitive function after different nap durations in interns after shift work. <br><br>METHODS: A total of 105 interns were randomly allocated to one of three groups (non-nap, n = 35; 15-min nap, n = 35; 45-min nap, n = 35) to perform cognitive tests and resting vmHRV at 12:00, 15:00 and 18:00. Information processing (digit symbol substitution test; DSST), motor speed (finger tapping test; FTT), response selection (choice reaction time; CRT), and attention shifts (shifting attention test; SAT) were assessed. Resting vmHRV was assessed at baseline and during each cognitive task across groups. <br><br>RESULTS: Compared with the non-nap control, the 15-min and 45-min naps improved all outcome measures (including subjective sleepiness and cognitive performance) at 15:00, with some benefits maintained at 18:00. The 15-min nap produced significantly greater benefits on the FTT at 15:00 after napping than did the 45-min nap. Resting vmHRV was significantly correlated with DSST and SAT performance. In addition, FTT performance was the only significant predictor of DSST performance across different nap durations. <br><br>CONCLUSION: Our results demonstrate links between daytime napping (in particular, a 15-min nap) and improved cognitive control in relation to autonomic activity after shift work in interns. These results indicated that autonomic activity when awake plays a crucial role in DSST and SAT performance and facilitated the understanding of differences in neurocognitive mechanisms underlying information processing after different nap durations.<p />  <p>Language: en</p>
LA  - en
SN  - 2296-2565
UR  - http://dx.doi.org/10.3389/fpubh.2022.922716
ID  - ref1
ER  -