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ISBNPA XChange 2020 - All recordings

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Live Symposium: Is it now time to recommend a ‘safe’ dose of sedentary time for public health guidelines?

Purpose: To discuss whether sufficient evidence exists to recommend a ‘safe’ dose of sedentary time that can be used in public health guidelines. Rationale: Many countries are now working on the creation of 24 hour movement behaviour guidelines. An extensive body of evidence is available on the associations of physical activity with a number of health outcomes, which has resulted in clear, quantitative recommendations (i.e. a minimum dose of 150 minutes of moderate vigorous physical activity per week for adults and older adults, and 60 minutes per day for children). For sedentary behaviour the evidence is more limited and less consistent. Thus, recommendations to date have been more general, such as “sit less”, or they have focused on one specific behaviour, such as screen time. The issue addressed in this symposium is whether it is now time to consider guidelines on ‘safe’ doses and/or patterns of sedentary time at key life stages, and what evidence is needed to inform such considerations. Objectives: This session will aim to answer the following questions, within a lifespan perspective that will include evidence from children/youth, adults, and older adults: 1. Are the epidemiological and experimental findings consistent? Are there discrepancies that require further investigation? 2. What outcomes should be focused on when it comes to prolonged sedentary time, and are there important confounding factors that have been missed in the research to date? 3. What evidence is available for beneficial ‘doses’ – lower volumes or the ideal frequency, and/or duration of interruptions to sedentary time? Can guidelines be formulated at this time? 4. What are the key recommendations for future research? Summary: The questions posed in this symposium are intentionally controversial, and are hoped to spark lively discussion and debate with the audience. The session chair will start by clarifying terminology and definitions, reviewing current guidelines, and identifying key anomalies in available evidence. Each of the three speakers will then address the questions outlined above using evidence across the lifespan. The chair will then serve as a Discussant, encouraging debate and discussion from the audience.