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TL;DR
The central result was that high overall physical activity was associated with lower mortality risk, and the specific timing of daytime activity was less important than achieving a certain activity level.
The International Journal of Behavioral Nutrition and Physical Activity · 16 authors, 9 centres
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The central result was that high overall physical activity was associated with lower mortality risk, and the specific timing of daytime activity was less important than achieving a certain activity level.
Four patterns (fPCs) explained 96% of the data variation. A high overall activity score (fPC1) was associated with lower mortality (HR=0.91 for score +2), while low overall activity was associated with higher mortality (HR=1.69 for score -2). Midday activity (fPC3) was inversely associated with mortality (HR=0.88 per unit increase), while a pattern of midday and nocturnal activity (fPC4) was positively associated with mortality (HR=1.16 per unit increase). The study suggests that achieving a minimum level of physical activity is more critical for longevity than the specific daytime timing. Limitations include potential confounding, reactivity to wearing a monitor, and the exclusion of intense single activity bouts.