Evidence map›Paper›PMID 42649464›Full record

ArticleAmerican journal of industrial medicine2026

Timing of Work-Rest Implementation Influences Worker Productivity Under Heat Stress: Evidence for Initial Stay Time-Based Scheduling.

Glen P Kenny, Kelli E McCormick, Katie E Wagar, Roberto C Harris-Mostert, James J McCormick, Leonidas G Ioannou, Fergus K O'Connor

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Article in American journal of industrial medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

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PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Glen P KennyHuman and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.ORCID https://orcid.org/0000-0001-8683-6973
Kelli E McCormickHuman and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.
Katie E WagarHuman and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.ORCID https://orcid.org/0009-0002-2893-8626
Roberto C Harris-MostertHuman and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.
James J McCormickHuman and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.
Leonidas G IoannouMedical School, University of Cyprus, Nicosia, Cyprus.ORCID https://orcid.org/0000-0001-5460-8167
Fergus K O'ConnorHuman and Environmental Physiology Research Unit, School of Human Kinetics, University of Ottawa, Ottawa, Ontario, Canada.ORCID https://orcid.org/0000-0001-9509-7682

Funding

Natural Sciences and Engineering Research Council of Canada RGPIN-2020-03891Workplace Safety and Insurance Board KENN2023
6 · The paper itself

Abstract

introductionWork-rest allocations recommended by the American Conference of Governmental Industrial Hygienists (ACGIH) limit heat strain and are typically implemented from the onset of work. Whether delaying implementation until after the initial stay time (IST; the duration of continuous work before core temperature reaches 38.0°C) improves total work performed is unknown.

methodsYoung males performed moderate- (200 W·m

resultsDuring moderate work, total work time was greater with Protocol A in the morning (+24 min, 95% CI: 13-36, p < 0.001), with no difference in the afternoon (0 min, 95% CI: -12 to 12, p = 0.994). During heavy work, morning work time was also greater with Protocol A (+30 min, 95% CI: 22-38, p < 0.001), with no afternoon difference (+7 min, 95% CI: -1 to 15, p = 0.081). Time above 38.3°C did not differ during moderate work (p = 0.252) and was lower during heavy work (-24 min, 95% CI: -44 to -4, p = 0.017).

conclusionDelaying work-rest cycles until after IST increases morning work output by ~10%-13% without increasing time above critical core temperature thresholds.

Indexed as

EfficiencyHeat Stress DisordersRestWork Schedule ToleranceAdultHot TemperatureHumansMaleTime FactorsWorking ConditionsYoung AdultAmerican Conference of Governmental Industrial Hygienistsexposure limitsheat stressoccupational heat stresswork capacity

Identifiers

PMID42649464

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.