High prevalence of hypohydration in occupations with heat stress-Perspectives for performance in combined cognitive and motor tasks
Piil JF, Lundbye-Jensen J, Christiansen L, Ioannou L, Tsoutsoubi L, Dallas CN, Mantzios K, Flouris AD, Nybo L
PloS one · 75 citations
How it was studied
- Design
- Randomized controlled trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Independent funding
- Government
- European Commission
- Government
- European Union’s Horizon 2020 research and innovation program
- Grants
- European Commission (668786); European Commission (HORIZON2020)
Based on 2 listed funder(s) and full-text disclosure statement.
Publication
- Published
- 2018-10-24 · PLoS One · vol. 13 · issue 10 · p. e0205321
- Publisher
- Public Library of Science
- Cited
- 96 citations · more than 97% of similar papers · 5.7× the field average
- Impact
- Top 10% most cited in its field
- References
- 61 works
- Access
- Open access (journal) · CC-BY
- Research areas
- Thermoregulation and physiological responses · Muscle metabolism and nutrition · Exercise and Physiological Responses
- Keywords
- Heat stress, Cognition, Stress (linguistics), Physical medicine and rehabilitation, Medicine, Psychology, Gerontology, Clinical psychology, Psychiatry, Biology
- MeSH
- humans, dehydration, heat stress disorders, fever, body weight, exercise, cognition, occupational exposure, water-electrolyte balance, heat-shock response, drinking, gravitation, adult, europe, male, cognitive dysfunction
9 authors
From DK, GR
- Jacob F. Piil · correspondingUniversity of Copenhagen
- Jesper Lundbye‐JensenUniversity of Copenhagen
- Lasse ChristiansenUniversity of Copenhagen
- Leonidas G. IoannouUniversity of Thessaly
- Lydia TsoutsoubiUniversity of Thessaly
- Constantinos N. DallasUniversity of Thessaly
Abstract
Purpose
To evaluate the prevalence of dehydration in occupational settings and contextualize findings to effects on performance in cognitively dominated tasks, simple and complex motor tasks during moderate and high heat stress.
Methods
The study included an occupational part with hydration assessed in five industries across Europe with urine samples collected from 139 workers and analyzed for urine specific gravity. In addition, laboratory experiments included eight male participants completing mild-intensity exercise once with full fluid replacement to maintain euhydration, and once with restricted water intake until the dehydration level corresponded to 2% bodyweight deficit. Following familiarization, euhydration and dehydration sessions were completed on separate days in random order (cross-over design) with assessment of simple motor (target pinch), complex motor (visuo-motor tracking), cognitive (math addition) and combined motor-cognitive (math and pinch) performance at baseline, at 1°C (MOD) and 2°C (HYPER) delta increase in body core temperature.
Results
The field studies revealed that 70% of all workers had urine specific gravity values ≥1.020 corresponding to the urine specific gravity (1.020±0.001) at the end of the laboratory dehydration session. At this hydration level, HYPER was associated with reductions in simple motor task performance by 4±1%, math task by 4±1%, math and pinch by 9±3% and visuo-motor tracking by 16±4% (all P0.05). In the euhydration session, HYPER reduced complex (tracking) motor performance by 10±3% and simple pinch by 3±1% (both P0.05).
Conclusion
Dehydration at levels commonly observed across a range of occupational settings with environmental heat stress aggravates the impact of hyperthermia on performance in tasks relying on combinations of cognitive function and motor response accuracy.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).
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