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. 2022 Feb;122(2):523-530.
doi: 10.1007/s00421-021-04852-9. Epub 2021 Nov 30.

Possible effects of short rest after lunch on hemodynamics in the afternoon

Hinako Nakao  1 , Chihiro Kashiwakura  1 , Shohei Shibasaki  1 , Keiichiro Harashima  1 , Satoshi Nakajima  1 , Hiroaki Ohnishi  2 , Takashi Watanabe  2 , Tomonori Kishino  3
Affiliations

Possible effects of short rest after lunch on hemodynamics in the afternoon

Hinako Nakao et al. Eur J Appl Physiol. 2022 Feb.

Abstract

Purpose: Drowsiness is often experienced in the afternoon after lunch. Decreases in blood flow to the brain secondary to increases in blood flow to the digestive organs after food intake could represent an underlying cause. As various beneficial effects of short rests on mental activities have been reported, the present study investigated hemodynamics using Doppler sonography of the common carotid artery (CCA) and superior mesenteric artery (SMA) after lunch, comparing resting and non-resting cases.

Methods: Subjects comprised 24 healthy young adults (10 men, 14 women; mean age 22 ± 1 years). Sonography was performed to measure blood flow before and after lunch on each day, with and without a 15-min lying rest with eyes closed after lunch in each subject.

Results: The timing of the peak velocity-time integral in the SMA in resting cases was delayed to 1.5 h after lunch compared to 0.5 h in non-resting cases. Although end-diastolic velocity in the CCA decreased after lunch, this decrease was suppressed in resting cases compared to non-resting cases even 4.5 h after lunch (median 96%, interquartile range [IQR] 83-102% vs. median 87%, IQR 77-92%; P = 0.037). Mean velocity (MV) in the CCA maintained unchanged after lunch in resting cases (P = 0.318), whereas non-resting cases showed decreased MV after lunch (P < 0.001).

Conclusion: These findings suggest that a short lying rest with eyes closed suppresses increases in blood flow to the digestive organ and maintains blood flow to the brain after lunch. These hemodynamic changes might help explain the benefits of afternoon rests.

Keywords: Afternoon; Doppler sonography; Hemodynamics; Lunch; Rest.

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References

    1. Alexandrov AV, Tsivgoulis G, Rubiera M, Vadikolias K, Stamboulis E, Molina CA, Alexandrov AW, TUCSON Investigators (2010) End-diastolic velocity increase predicts recanalization and neurological improvement in patients with ischemic stroke with proximal arterial occlusions receiving reperfusion therapies. Stroke 41:948–952 - DOI
    1. Aoto Y, Kishino T, Harashima K, Ohnishi H, Fukuta N, Hashimoto S, Seki M, Shimo Y, Sekiguchi K, Takagi Y, Otaki J, Watanabe T (2017) Influence of eating breakfast on sonographic examination of the gallbladder. Rinsho Byori 65:1177–1181
    1. Backhaus W, Braass H, Gerloff C, Hummel FC (2018) Can daytime napping assist the process of skills acquisition after stroke? Front Neurol 9:1002 - DOI
    1. Brokaw K, Tishler W, Manceor S, Hamilton K, Gaulden A, Parr E, Wamsley EJ (2016) Resting state EEG correlates of memory consolidation. Neurobiol Learn Mem 130:17–25 - DOI
    1. Carskadon MA, Dement WC (1987) Daytime sleepiness: quantification of a behavioral state. Neurosci Biobehav Rev 11:307–317 - DOI

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