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the claim

Distance running causes muscle loss in recreational runners.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that distance running causes muscle loss in recreational runners?

Partly. Evidence is mixed and only partial: an encyclopedia entry suggests endurance runners may shed excess muscle via lower testosterone, while a rat study and a marathon study indicate running causes muscle damage or adaptation rather than muscle mass loss. No source directly measures muscle loss in recreational distance runners.

Verdict: CONTESTED PARTIAL · 2 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Long-distance running
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Long-distance running. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Long-distance_running

Evidence against · 4
Impact of different running distances on muscle and lymphocyte DNA damage in amateur marathon runners -
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Impact of different running distances on muscle and lymphocyte DNA damage in amateur marathon runners - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1589/jpts.28.450

See more details
More for · 1
DISTANCE RUNNING. (Otago Witness, 06 August 1891)
1891
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DISTANCE RUNNING. (Otago Witness, 06 August 1891). (1891). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/OW18910806.2.77

More against · 3
Effects of voluntary wheel running on satellite cells in the rat plantaris muscle.
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Effects of voluntary wheel running on satellite cells in the rat plantaris muscle.. (n.d.). cir.nii.ac.jp. https://cir.nii.ac.jp/crid/1873121242905665024

Effects of acute voluntary loaded wheel running on BDNF expression in the rat hippocampus
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Effects of acute voluntary loaded wheel running on BDNF expression in the rat hippocampus. (n.d.). cir.nii.ac.jp. https://doi.org/10.20463/jenb.2017.0034

Changes in serum creatine kinase, leg muscle tightness, and delayed onset muscle soreness after a full marathon race.
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Changes in serum creatine kinase, leg muscle tightness, and delayed onset muscle soreness after a full marathon race.. (n.d.). cir.nii.ac.jp. https://cir.nii.ac.jp/crid/1873684193763536768

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