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Effects of breaking up deskwork with physical activity accompanied with tea consumption on cerebrovascular function, mood, and affect

Low, DA, Thijssen, DHJ, Hopkins, ND, Speretta, G, Johns, J and Fornasiero, A Effects of breaking up deskwork with physical activity accompanied with tea consumption on cerebrovascular function, mood, and affect. International Journal of Cardiovascular Sciences. ISSN 2359-4802 (Accepted)

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Abstract

Background: Prolonged sitting, typical of office deskwork, decreases cerebral blood flow (CBF) and mood and affect. Conversely, short physical activity breaks from sitting may prevent these detrimental effects and provide cardiometabolic benefits. Objective: We evaluated the effect of interrupting prolonged sitting with light and short duration physical activity breaks accompanied by tea consumption on CBF, cerebral autoregulation (CA), mood, and affect in desk workers. Methods: Nineteen healthy desk workers (ten male, 27±10 years) conducted deskwork in a laboratory for 6 hours during two separate intervention days: tea breaks (TEA-BREAK: 1 cup of tea/hour combined with walking breaks to prepare the tea) and sedentary (SED: 1 cup of water/hour whilst seated). Before and after deskwork, we examined mean arterial pressure (MAP), middle cerebral artery blood velocity (MCAv) and CA. Questionnaires were used to assess mood (Bond & Lader, PANAS) and affect (Affect grid) before and after the intervention. Data are expressed as mean ± standard deviation. Two-way ANOVA with repeated measurements followed by Sidak post hoc test was used. Paired Student t-test was also used to compare changes (∆) between trials. Statistical significance was at p<0.05. Results: Deskwork increased MAP (4.6±4.6 ∆ mmHg; P<0.05), and decreased MCAv (-5.2±7.0 ∆ cm/s; P<0.05). We found no difference between interventions related to these parameters. TEA-BREAKS, but not SED, altered CA. Specifically, TEA-BREAKS decreased gain (-0.08±0.12 ∆ cm.s-1.mmHg.-1) and increased phase (5.26±8.84 ∆ radians) at very low frequency (P<0.05), but not at low frequency. Small changes in positive affect were found after the 6-hour deskwork (-5.5±7.3 ∆ scale; P<0.05), which did not differ between interventions. Conclusion: The deskwork-related alterations in MCAv and positive affect could not be prevented by TEA-BREAKS. However, TEA-BREAKS improved CA, suggesting higher efficiency in maintaining MCAv in response to blood pressure fluctuation.

Item Type: Article
Subjects: B Philosophy. Psychology. Religion > BF Psychology
R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine
R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Brazilian Society of Cardiology
Date Deposited: 08 Apr 2021 08:32
Last Modified: 08 Apr 2021 08:32
URI: https://researchonline.ljmu.ac.uk/id/eprint/14533

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