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Climbing & rescue · Research synthesis

Harness suspension, examined.

An indoor experiment, its physiological observations, and why it cannot establish a safe hanging time.

4 min readReview record: October 16, 2026Version 0.1.2Published synthesis

Start with the question

What did the passive-suspension experiment actually test?

Source findingAn indoor crossover experiment examined circulation during passive harness suspension in 20 healthy male volunteers. Near-fainting occurred in 12 of 40 tests, with widely varying timing. The unit here is a test, not a count of 12 different people.[1]

SynthesisThe study provides physiological evidence from controlled passive suspension. It is not a safe hanging-time limit, an experiment in injured patients, or a test of first-aid training.[1]

MTN educational interpretationFor a training discussion, keep the experimental conditions attached to the observations. An actual climbing or rescue situation may involve injuries, equipment and movement that this experiment did not test.[1]

Study at a glance

Who—and what—was studied?

Population

20 healthy male volunteers underwent 40 tests. Participants were not injured rescue patients.

Design and setting

An indoor randomized crossover experiment using one sit harness, restricted movement and a maximum test duration of 60 minutes.

Keep the boundaries visible

What this evidence cannot tell us.

  • Small, selected sample of healthy male volunteers.
  • One harness and a restricted indoor protocol.
  • The 60-minute protocol limit is not evidence of a safe suspension duration.
  • No treatment recommendation or training-outcome claim is derived from the experiment.

Read the originals

Sources & review record.

  1. 1. Rauch S et al. Suspension syndrome: a potentially fatal vagally mediated circulatory collapse—an experimental randomized crossover trial. Eur J Appl Physiol. 2019;119:1353–1365. doi:10.1007/s00421-019-04126-5.

    FULL TEXT REVIEWED

    Methods: Study population and Study design; Results: presyncope occurrence and timing; Discussion/Limitations. Full-source reviewer read all five figures, supplement and the acknowledgement-only correction.

    Open original source ↗ (opens in a new tab)
    Access, attribution & rights notes

    Complete-source audit supplied by the research review task, October 15, 2026. Bounded editorial verification of the displayed claims, units and source mapping completed October 15, 2026.

    CC BY 4.0. This page uses original prose and independently drawn line art.

    Review record: 2026-10-16. Article version: 0.1.2.

How each passage is supported

Paragraph 1 · Source finding

Methods: study population/design; Results: presyncope occurrence and timing

Sources 1 · Version 0.1.2

Paragraph 2 · Synthesis

Study design, discussion and limitations

Sources 1 · Version 0.1.2

Paragraph 3 · MTN educational interpretation

Educational interpretation of the stated population and protocol limits

Sources 1 · Version 0.1.2