Moore et al published an analysis of the effect of leisure time activity and the effect on life expectancy with data from over 650,000 individuals with a 10 year followup in persons aged 40 and over.
At the lowest exercise level which was 3.74 met-hr/week ( a MET level of 3 is described by the authors as a brisk walk and this level being equivalent to 75 minutes of brisk walking per week) there was a gain of 1.8 years.
150-300 minutes of a brisk walk per week yielded 3.4 years gained.
300- 449 minutes of brisk walking was associated with 4.2 year increase in life expectancy.
The lowest level at which they demonstrated a life expectancy gain was less than the minimal recommendation of WHO and of the US panel. Benefit seemed to plateau at around 300 mintues of brisk walking per week. Moore's data display was not U shaped.
1) Moore, SC Leisure time physical activity of moderate to vigorous intensity and mortality. Plos Med 2012 e1001 335
2) Aengevaeren,VL Exercise and coronary atherosclerosis. Circulation vol 141 no 16, 21 april 2020 p 1338 1350
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