Three supervised hours a week, held for more than a year, is the entire protocol.
In the older adults who had run it, 55.9 percent of the age-related upregulation in skeletal muscle was missing, along with 57.1 percent of the downregulation. Their muscle read, across a large slice of its transcriptome, like the muscle of people in their twenties.
Three supervised hours a week, held for more than a year, is the entire protocol.
The cohort was small and it was sorted by function rather than by intent. Eleven young adults in their twenties. Fifteen normally active older adults, sixteen trained older adults, five physically impaired.
Every participant gave muscle before and after a single submaximal bout, and the samples went through transcriptomics, lipidomics and metabolomics.
That is the number the longevity market has to answer this quarter.
Advanced longevity assessment, the tier with whole-body imaging, genomics and more than a hundred biomarkers, runs US$8,000 to US$15,000 and up. An annual membership with repeat diagnostics and a clinical team sits at US$10,000 to US$25,000 and up. Three hours a week costs a gym subscription and the two evenings you stop pretending are negotiable.
Now the half that did not move.
Training left roughly half of muscle ageing’s molecular signature exactly where it was. The synaptic-transmission genes PCDH8 and UNC13C stayed changed. So did DAAM2 and CTR9 in the WNT pathway, in every older participant, trained or not.
Those genes did not care how many hours anyone had put in.
Grade the evidence before you spend anything on it. The trained group was compared with the untrained, not followed from the day they started, so the study shows what trained older muscle looks like rather than what training does to untrained older muscle. That is Level 2, an association in 47 people, and it is a real finding sitting one design short of the claim most readers will take from it.
The mechanism work is a step behind that and closer to home.
A Duke-NUS team, with Singapore General Hospital and Cardiff University, reported in PNAS that a gene called DEAF1 drives mTORC1 overactivity as muscle ages, tilting cells toward making new protein while the clearing of damaged protein slows.
Raise DEAF1 in fruit flies and mice and the muscle weakens faster. Lower it and protein balance and strength come back.
You are buying half a molecular profile with three hours of your week, and nobody has priced the other half.
“Physical activity activates certain proteins which lower DEAF1 levels, bringing the growth pathway back into balance,” said Assistant Professor Tang Hong-Wen. His colleague Priscillia Choy Sze Mun put it as exercise telling muscle to clean up and reset.
In flies and mice, which is Level 3 for anything you might do about it on a Tuesday.1
Two things are worth watching next.
Whether a randomised training intervention reproduces that 50-odd percent in adults who were sedentary at enrolment, which is the study nobody has run. And whether DEAF1 proves movable in human tissue by something other than exercise, because that is the molecule the next injectable will be built around.
Three hours a week bought half the signature.
Nothing on a Singapore price list has been shown to buy the other half, which makes the free half the only one anybody has collected.
Footnotes
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The reverse reading of the cohort deserves saying out loud: an older adult who can hold three supervised hours a week for a year may be someone whose muscle was ageing well enough to allow it. The trained group and the well-ageing group can be the same group, and this design cannot separate them. ↩