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We thank Chaput and colleagues1 for their comments on our recent review2 that examined the timeliness of sitting guidelines and provided a critical overview of the sedentary behaviour evidence base. To recap for the reader: we argued that evidence of sitting and health is limited and we urged caution to prevent enthusiastic but premature guideline development. Chaput and colleagues argued that the sedentary behaviour evidence base is adequate and that a provisional screen time-based benchmark is better than no benchmark at all. We see four main areas for debate and discuss them in turn.
Dispute #1: ‘activity mixes’ and ‘reconceptualisation’ of physical activity in public health
Initially, our respected international colleagues1 proposed that the field needs to move towards ‘activity mixes’ that take into account the 24-hour compositional nature of the physical activity, sedentary behaviour and sleep data. Consider a weekend day when a person goes for a 3-hour bike ride. That reduces potential sitting time by 3 hours, so these physical activity elements, moderate to vigorous physical activity (MVPA) (bike ride), and sedentary …
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