Cerebrovascular Circulation

IJCS

Editorial

Small Exercise Breaks can Save your Brain from Prolonged Sitting

A sedentary lifestyle is one of the major risk factors for the development of cardiovascular diseases. For instance, in 2019, stroke was the second-leading cause of death, as well as the primary cause of death and disability combined in the world. Active commuting to work is one strategy to decrease sedentary time and its impact, and the COVID-19 pandemic has changed work and daily routines worldwide. Moreover, the necessary social distancing has led to increased sedentary time, especially for those who are engaged in office desk work .

Acute prolonged sitting seems to lead to transient impairment of the endothelial function in the healthy population, whether this phenomenon is related to cardiovascular or cerebrovascular events is unknown. Nonetheless, prolonged sitting impairs the cerebrovascular function.^, Conversely, exercise breaks from prolonged sitting seem to restore the endothelial and cerebrovascular function. Therefore, active breaks from prolonged sitting could be a good strategy to mitigate the effects of sedentary time. However, the ideal duration and intensity need further investigation. Additionally, the difficulty to implement exercise breaks as a daily routine for office workers must be considered.

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IJCS

Original Article

Effects of Breaking up Deskwork with Physical Activity Combined with Tea Consumption on Cerebrovascular Function, Mood, and Affect

Guilherme F. Speretta et al. Alessandro Fornasiero Jarrett A. Johns Nicola Hopkins … Dick H. Thijssen David A. Low

Abstract

Background:

Prolonged sitting, typical of desk work, decreases cerebral blood flow (CBF), 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 short breaks of light physical activity combined with tea consumption on CBF, cerebral autoregulation (CA), mood, and affect in desk workers.

Methods:

Nineteen healthy desk workers (ten male, 27±10 years) performed desk work in a laboratory for six hours on two separate intervention days: tea breaks (TEA-BREAK: short walk combined with ingestion of one cup of tea every hour) and sedentary (SED: ingestion of one cup of water every hour, while seated). Before and after desk work, we assessed 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 for data analysis. Paired Student’s t-test was also used to compare changes (Δ) between trials. Statistical significance was at p<0.05.

Results:

Desk work increased MAP (4.6±4.6 Δ mmHg; P<0.05), and decreased MCAv (-5.2±7.0 Δ cm/s; P<0.05), with no difference between interventions in these parameters. TEA-BREAKS, but not SED, decreased gain (-0.08±0.12 Δ cm.s⁻¹.mmHg.⁻¹) and increased phase (5.26±8.84 Δ radians) at very low frequency (P<0.05), but not at low frequency. Small changes in positive affect were found after the six hours of desk work (-5.5±7.3 Δ scale; P<0.05), with no differences between interventions.

Conclusion:

Changes in MCAv and positive affect induced by prolonged desk work could not be prevented by TEA-BREAKS. However, TEA-BREAKS improved CA, suggesting a higher efficiency in maintaining MCAv in response to blood pressure fluctuations.