Evidence map›Paper›PMID 26769955›Full record

ArticleJournal of applied physiology (Bethesda, Md. : 1985)2016

Interaction between environmental temperature and hypoxia on central and peripheral fatigue during high-intensity dynamic knee extension.

Alex Lloyd, Margherita Raccuglia, Simon Hodder, George Havenith

Abstract read
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In one paragraph

Article in Journal of applied physiology (Bethesda, Md. : 1985), 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed, 2 pooled it
–field-weighted citation impact
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

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

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

23 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
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  9. Combining hypoxia with thermal stimuli in humans: physiological responses and potential sex differences.American journal of physiology. Regulatory, integrative and comparative physiology · 2023
    Review
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  12. Neuromuscular Adaptations after an Altitude Training Camp in Elite Judo Athletes.International journal of environmental research and public health · 2021
    Article
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

4 authors.

Alex LloydEnvironmental Ergonomics Research Centre, Loughborough University, Loughborough, United Kingdom.
Margherita RaccugliaEnvironmental Ergonomics Research Centre, Loughborough University, Loughborough, United Kingdom.
Simon HodderEnvironmental Ergonomics Research Centre, Loughborough University, Loughborough, United Kingdom.
George HavenithEnvironmental Ergonomics Research Centre, Loughborough University, Loughborough, United Kingdom G.Havenith@lboro.ac.uk.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

This study investigated causative factors behind the expression of different interaction types during exposure to multistressor environments. Neuromuscular fatigue rates and time to exhaustion (TTE) were investigated in active men (n = 9) exposed to three climates [5 °C, 50% relative humidity (rh); 23 °C, 50% rh; and 42 °C, 70% rh] at two inspired oxygen fractions (0.209 and 0.125 FiO2; equivalent attitude = 4,100 m). After a 40-min rest in the three climatic conditions, participants performed constant-workload (high intensity) knee extension exercise until exhaustion, with brief assessments of neuromuscular function every 110 s. Independent exposure to cold, heat, and hypoxia significantly (P < 0.01) reduced TTE from thermoneutral normoxia (reductions of 190, 405, and 505 s from 915 s, respectively). The TTE decrease was consistent with a faster rate of peripheral fatigue development (P < 0.01) compared with thermoneutral normoxia (increase of 1.6, 3.1, and 4.9%/min from 4.1%/min, respectively). Combined exposure to hypoxic-cold resulted in an even greater TTE reduction (-589 s), likely due to an increase in the rate of peripheral fatigue development (increased by 7.6%/min), but this was without significant interaction between stressors (P > 0.198). In contrast, combined exposure to hypoxic heat reduced TTE by 609 s, showing a significant antagonistic interaction (P = 0.003) similarly supported by an increased rate of peripheral fatigue development (which increased by 8.3%/min). A small decline (<0.4%/min) in voluntary muscle activation was observed only in thermoneutral normoxia. In conclusion, interaction type is influenced by the impact magnitude of the effect of the individual stressors' effect on exercise capacity, whereby the greater the effect of stressors, the greater the probability that one stressor will be abolished by the other. This indicates that humans respond to severe and simultaneous physiological strains on the basis of a worst-strain-takes-precedence principle.

Indexed as

AdultCold TemperatureEnvironmentExerciseHot TemperatureHumansHypoxiaKneeKnee JointMaleMuscle FatigueMuscle, SkeletalOxygenOxygen ConsumptionPhysical EnduranceStress, PhysiologicalOxygencentral motor drivecombined stressorshigh altitudeneuromuscular fatiguethermal stress

Identifiers

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

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.