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Population study: followed a group

In 28,879 women, strength training linked to lower death risk, not at high amounts

Kamada and colleagues · Journal of the American Heart Association · 2017

Original title: Strength Training and All-Cause, Cardiovascular Disease, and Cancer Mortality in Older Women: A Cohort Study.

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What the study found

Mixed

All-cause death HRs: 0.73 (1-19), 0.71 (20-59), 0.81 (60-149) and 1.10 (≥150 min/wk; 0.77-1.56). J-shaped curve; lowest risk at 20-59 minutes a week. Wide intervals at high amounts.

The study at a glance

Type of study
Population study: followed a group
Who or what was studied
28,879 people · US women, average age 62.2, free of heart disease, diabetes and cancer; followed 12 years
What was tested
Minutes a week of strength training (0, 1-19, 20-59, 60-149, 150 or more) vs none, linked to death
What it measured
The question itself: death from any cause and healthy aging
Who has a stake
No disclosure in PubMed
No disclosure in PubMed; funded by US National Institutes of Health.
Journal
Journal of the American Heart Association, 2017
Source
PubMed record 29089346. This page is based on the abstract only.

How much this study counts

  • –Shows a link, not a cause: people chose their own habits, and other differences between them may explain the result.
  • ✓Followed people over time, so habits were recorded before the outcome happened.
  • ✓Large: 28,879 people.
  • ✓Measured the question itself: death from any cause and healthy aging.
  • •The PubMed record has no conflict-of-interest statement.
  • •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: death and healthy aging

    0

    Not done yet. This is the step that would answer the question.

  2. Trials in people: other measures

    9

    7 benefit, 2 no difference

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    9

    8 benefit, 1 mixed

    ↑ This study is the ringed dot

  5. Blood levels and genes

    0

    None among the papers we read.

↓ 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 strength training help you live longer?”

Linked to longer life; not proven.

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

Read the full answer

Of the other 8 papers on the same step: 8 benefit. This one found mixed. It differs from most of them.

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 agreed on every checked field. 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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