According to the study results published in Stroke, sedentary leisure time of 8 hours or more per day is associated with an increased long-term risk of stroke in adults under 60 years of age with low physical activity.
Several studies have shown that physical activity is associated with a lower risk of stroke and that excessive mobility can increase the risk of cardiovascular morbidity and mortality. Sitting time is defined as the number of hours spent in front of the computer, reading and watching TV; Sedentary leisure time is specific to the sedentary activity that is performed outside of work.
The aim of the current study was to determine the relationship between self-reported sedentary leisure time and stroke.
Using data from 143,180 people who participated in the Canadian Community Health Survey between 2000 and 2012, a cohort of healthy patients without a history of stroke, heart disease or cancer was identified. The freedom of movement in leisure time was divided into 4 groups according to the self-reported movement time in leisure time per day (<4 hours, 4 to <6 hours, 6 to <8 hours or ≥8 hours).
During a median follow-up of 9.4 years, there were 2965 stroke events (88.2% ischemic). In people under 60 years of age with little physical activity, the risk of stroke was increased in people with 8 or more hours of free time per day compared to people with less than 4 hours of free time per day (adjusted hazard ratio 4.50.). ; 95% CI, 1.64-1.23).
In people aged 60 to 79 and people aged 80 and over, there was no significant association between any category of sedentary time and the risk of stroke.
The results remained unchanged after adjustment for potential vascular and social confounders, multiple sensitivity analyzes and taking into account the competing risk of death.
The study had several limitations, including a lack of data on work-related sedentary time, potential memory bias as a result of assessing sedentary time using self-reported data, and a lack of data on the association between sedentary leisure time and the risk of hemorrhagic stroke .
“[H]high sitting time with low [physical activity] is associated with an increased risk of stroke in young people. Public health efforts are increasing [physical activity], as well as reducing high sedentary time in young people, may help lower the long-term risk of stroke in this population, ”the researchers concluded.
Joundi RA, Patten SB, Williams JVA, Smith EE. Association between excessive sedentary leisure time and stroke risk in young people. Stroke. Published online August 19, 2021. doi: 10.1161 / STROKEAHA.121.034985