Time spent in passive travel and leisure computer and electronic device use appears to have increased. Accelerometer-measured sedentary time, leisure reading (among those < 50 years) and television/video viewing in younger age groups have remained relatively stable (with a possible slight decline in television/video viewing). Changes in questions and/or response categories precluded direct assessment of trends over time for some measures however, certain trends were observed. Nineteen national surveys were identified. We summarize amounts of total device-assessed sedentary time and self-reported sedentary activities (e.g., passive travel, leisure television, computer, video games, screen, and reading) by age group over time. We describe and document all data sources of sedentary behaviour at the national level in Canada, and report on selected prevalence data from repeated cross-sectional surveys. Lessons learned can benefit the wider international surveillance community. Our objective is to document all sources and measures of sedentary behaviour from Canadian, nationally representative surveys, and report on selected estimates of time spent in sedentary activities. It is also unclear how changes in the measurement of sedentary behaviour affects national estimates. Historical changes in the nature of sedentary activities have been observed in other countries, but it is not clear if similar trends exist in Canada.

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