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Randomized trial · measured lab tests or safety

14-week trial in 47 older adults found mixed results for metformin during strength training

Kulkarni and colleagues · Aging · 2020

Original title: Metformin alters skeletal muscle transcriptome adaptations to resistance training in older adults.

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What the study found

Mixed

Metformin reduced the number of muscle genes changed by training, and an earlier result showed it blunted muscle growth. Genes unique to the metformin group touched aging pathways such as cellular senescence and autophagy.

The study at a glance

Type of study
Randomized trial
Who or what was studied
47 people · Older adults doing resistance exercise training
What was tested
Metformin (n = 23) vs placebo (n = 24) during 14 weeks of resistance training; muscle gene activity
What it measured
Lab tests or markers
How long
14 weeks
Who has a stake
No stake declared
No competing interests declared.
Journal
Aging, 2020
Source
PubMed record 33071237. This page is based on the abstract only.

How much this study counts

  • ✓Randomized: people were put into groups by chance, so the groups start out alike.
  • ✓Compared with a placebo, a dummy treatment.
  • –Small: 47 people. Small trials can miss real effects or find chance ones.
  • •Lasted 14 weeks.
  • –Measured lab tests or markers, which stand in for aging, frailty and death in people without diabetes. A better marker does not always mean better health.
  • ✓No competing interests declared.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: aging and age-related disease

    1

    1 benefit

  2. Trials in people: other measures

    3

    2 no difference, 1 harm

  3. Trials in people: lab tests or safety

    6

    2 benefit, 2 mixed, 2 no difference

    ↑ This study is the ringed dot

  4. Population studies

    8

    6 benefit, 2 no difference

  5. Blood levels and genes

    0

    None among the papers we read.

  6. Animals

    3

    2 benefit, 1 harm

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does metformin slow aging in people without diabetes?”

Not shown in people without diabetes.

Confidence: low. Based on 26 on-topic papers.

Read the full answer

Of the other 5 papers on the same step: 2 benefit, 1 mixed, 2 no difference. This one found mixed.

Other papers on the same step

See all 26 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The two reads differed. The reviewer checked the abstract and kept the first read. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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