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. It is also unclear how changes in the measurement of sedentary behaviour affects national estimates. 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. Lessons learned can benefit the wider international surveillance community. 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. 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. Nineteen national surveys were identified. Changes in questions and/or response categories precluded direct assessment of trends over time for some measures; however, certain trends were observed. 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). Time spent in passive travel and leisure computer and electronic device use appears to have increased. Television and video viewing appears to have increased in older adults while their leisure reading appears to have fallen. Changes in measurement of sedentary behaviour can affect estimates and reduce comparability over time. Total leisure screen use appears to have increased over time, reflecting the ways in which Canadians spend their free time and technological advances. The main public health message is the need for continued efforts to reduce leisure screen use, especially among youth and older adults.

中文翻译：

---

加拿大的久坐行为监测：趋势，挑战和经验教训。

在其他国家，久坐活动的性质发生了历史性变化，但尚不清楚加拿大是否存在类似趋势。尚不清楚久坐行为量度的变化如何影响国家估算。我们的目标是记录来自加拿大，具有全国代表性的调查的久坐行为的所有来源和度量，并报告选定的久坐活动时间估计。吸取的教训可以使更广泛的国际监视界受益。我们描述并记录了加拿大国家一级久坐行为的所有数据来源，并报告了来自反复横断面调查的选定患病率数据。我们总结了设备评估的久坐时间和自我报告的久坐活动（例如，被动旅行，休闲电视，计算机，视频游戏，屏幕和阅读）（按年龄段）。确定了十九项全国调查。由于问题和/或回答类别的变化，某些措施无法及时评估趋势；但是，观察到某些趋势。加速度计测量的久坐时间，休闲阅读（<50岁者）和较年轻年龄组的电视/视频观看保持相对稳定（电视/视频观看可能略有下降）。被动旅行和休闲计算机和电子设备的使用时间似乎增加了。老年人的电视和视频观看量似乎有所增加，而他们的休闲阅读量似乎有所下降。久坐行为量度的变化会影响估计并随着时间的推移而降低可比性。随着时间的推移，休闲屏幕的总使用量似乎有所增加，这反映了加拿大人消磨空闲时间和技术进步的方式。公共卫生的主要信息是需要继续努力减少休闲屏幕的使用，尤其是在青年和老年人中间。