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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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Neck cooling and cognitive performance following exercise-induced hyperthermia.

Jason K W Lee1, Aldrich C H Koh, Serene X T Koh

  • 1Combat Protection and Performance Programme, Defence Medical and Environmental Research Institute, DSO National Laboratories, Singapore, Republic of Singapore, lkaiwei@dso.org.sg.

European Journal of Applied Physiology
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Summary
This summary is machine-generated.

Neck cooling may enhance cognitive performance during exertional hyperthermia, particularly for complex tasks. Exercise-induced hyperthermia itself improved alertness and working memory in healthy men.

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Area of Science:

  • Exercise Physiology
  • Cognitive Neuroscience
  • Thermoregulation

Background:

  • Exertional hyperthermia, a rise in core body temperature during exercise, can impact cognitive function.
  • Neck cooling is a potential strategy to mitigate the negative effects of heat stress on the brain.

Purpose of the Study:

  • To evaluate the effectiveness of a neck cooling collar (NCC) on cognitive performance after exercise-induced hyperthermia.
  • To investigate the influence of hyperthermia on cognitive functions and serum brain-derived neurotrophic factor (BDNF) levels.

Main Methods:

  • Twelve healthy males participated in two trials: a control (CON) and a neck cooling collar (NCC) trial.
  • Participants engaged in treadmill running at 70% VO2peak under warm, humid conditions until volitional exhaustion.
  • Cognitive tests (e.g., symbol digit matching, PVT, search and memory) and physiological measures (temperatures, HR, BDNF) were assessed pre- and post-exercise.

Main Results:

  • Neck temperature was significantly reduced with the NCC compared to CON (26.0 °C vs. 36.4 °C).
  • Exercise-induced hyperthermia improved reaction time in symbol digit matching and PVT, and increased digit span.
  • The NCC reduced errors in a complex search and memory task, while serum BDNF levels increased post-exercise in both trials.

Conclusions:

  • Exercise-induced hyperthermia can enhance certain aspects of cognitive function, including working memory and alertness.
  • Neck cooling may offer benefits for cognitive performance, particularly in tasks demanding higher complexity.
  • Further research is warranted to explore the specific mechanisms and applications of neck cooling in thermoregulatory and cognitive contexts.