Bryan Johnson· Author
The 2 national athletes also had an average SmO2(%) of (mean=29.5%, SD=32.6) and (mean=36.6%,SD=35.6%) respectively (4).
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The 2 national athletes also had an average SmO2(%) of (mean=29.5%, SD=32.6) and (mean=36.6%,SD=35.6%) respectively (4).
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Two national-level swimmers (mean age 18) in the study spent 152 and 126 seconds at SmO2(%) >10%, corresponding to 50.6% and 42% of the 5 minutes analyzed, their non-national level peers could only hold that level for 18% and 2% of the workout (4).