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Related Concept Videos

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Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Hyperthermia occurs when the body's temperature becomes unusually high, often due to heat exposure, intense physical activity, or certain illnesses. This condition can create a dangerous cycle where elevated body temperature increases the metabolic rate, generating more heat and potentially leading to organ failure and brain damage. A severe form of hyperthermia, called heat stroke, can raise body temperature to life-threatening levels. Fever, on the other hand, is a controlled form of...
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Related Experiment Video

Updated: Apr 17, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

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Fatigue and sleep under large summer temperature differences.

Hisako Fujii1, Sanae Fukuda2, Daisuke Narumi3

  • 1Osaka City University, Graduate School of Medicine, Osaka 540-0051, Japan.

Environmental Research
|February 16, 2015
PubMed
Summary

Rising summer air temperatures exacerbate fatigue, particularly in individuals with poor sleep quality. Air conditioner use, accommodation, and age are significant influencing factors.

Keywords:
FatigueSleepTemperature differences

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Area of Science:

  • Environmental Health
  • Sleep Science
  • Public Health

Background:

  • Increasing outdoor temperatures negatively impact health, affecting fatigue and sleep quality.
  • The precise relationship between fatigue, sleep quality, and ambient air temperature requires further elucidation.

Purpose of the Study:

  • To investigate the effects of rising summer air temperatures on fatigue and sleep quality in a healthy Japanese population.
  • To identify confounding factors influencing fatigue levels during warmer months.

Main Methods:

  • A survey was conducted in Osaka, Japan, involving 602 healthy volunteers across three summer months (July, August, September 2010).
  • Participants completed questionnaires assessing demographic variables, accommodation, fatigue (Chalder fatigue scale), and sleep quality (Pittsburgh Sleep Quality Index - PSQI).

Main Results:

  • Fatigue scores positively correlated with sleep quality scores across the cohort.
  • Poor sleepers exhibited significantly higher fatigue scores at elevated air temperatures compared to good sleepers.
  • Air conditioner usage, accommodation type, and participant age were identified as confounding factors for fatigue.

Conclusions:

  • Elevated summer air temperatures contribute to increased fatigue in healthy individuals.
  • Individuals with pre-existing poor sleep patterns are particularly susceptible to heat-related fatigue.
  • The findings highlight the role of air conditioning, accommodation, and age in modulating heat-induced fatigue.