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European Journal of Applied Physiology

, Volume 114, Issue 2, pp 375–384 | Cite as

Neck cooling and cognitive performance following exercise-induced hyperthermia

  • Jason K. W. LeeEmail author
  • Aldrich C. H. Koh
  • Serene X. T. Koh
  • Glen J. X. Liu
  • Amanda Q. X. Nio
  • Priscilla W. P. Fan
Original Article

Abstract

Purpose

To assess the efficacy of neck cooling on cognitive performance following exertional hyperthermia.

Methods

Twelve healthy men completed two experimental trials [control (CON) and neck cooling collar (NCC)] in a counter-balanced design. They ran on a treadmill at 70 % VO2peak under warm and humid conditions (dry bulb temperature: 30.2 ± 0.3 °C, relative humidity: 71 ± 2 %) for 75 min or until volitional exhaustion. Gastrointestinal, neck and skin temperatures, heart rate and subjective ratings were assessed. Serum brain-derived neurotrophic factor (BDNF) levels were measured before and after each run. Cognitive performance comprising symbol digit matching, search and memory, digit span, choice reaction time and psychomotor vigilance test (PVT) were assessed before and after exercise.

Results

Mean gastrointestinal temperature was similar after exercise between trials (CON: 39.5 ± 0.4 °C vs. NCC: 39.6 ± 0.3 °C; p = 0.15). Mean neck temperature was lowered in NCC compared to CON after the run (36.4 ± 1.6 °C vs. NCC: 26.0 ± 0.3 °C; p < 0.001). Exercise-induced hyperthermia improved mean reaction time in the symbol digit matching test (−134 ± 154 ms; p < 0.05) and the PVT (−18 ± 30 ms; p < 0.05). Maximum span was increased in the digit span test (1 ± 2; p < 0.05). Application of NCC reduced the number of search errors made in level 3 of the search and memory test (p < 0.05). Mean serum BDNF levels were increased following exercise-induced hyperthermia in both trials (p < 0.05).

Conclusion

Exercise-induced hyperthermia improves working memory and alertness. Neck cooling may only enhance performance in tasks of higher complexity.

Keywords

Hyperthermia Perceptual heat strain Short-term memory Working memory alertness Neurotrophin S100B 

Abbreviations

CON

Control

NCC

Neck cooling collar

BDNF

Brain-derived neurotrophic factor

PVT

Psychomotor vigilance test

Tgi

Gastrointestinal temperature

S100B

S100 calcium binding protein B

VO2peak

Peak aerobic capacity

RPE

Rating of perceived exertion

RTS

Rating of thermal sensation

SPES

Swedish performance evaluation system

TrkB

Tropomyosin receptor kinase B

Notes

Acknowledgments

The authors express their gratitude to Dr. Christopher Tyler for his advice on the neck collar and Ms. Lydia Law, Dr. Frederick Tey and Ms. Tan Ying Ying for their inputs on the selection of cognitive tests. We also like to thank Ms. Yvonne Yeo, Ms. Teo Ya Shi, Ms. Jacinta Yeo and Mr. David Fun for their assistance during data collection. The authors would also like to thank all participants for their commitment to the study. The study is funded by DSO National Laboratories, Singapore, and the National University of Singapore.

Conflict of interest

All authors declare they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Jason K. W. Lee
    • 1
    • 2
    • 3
    Email author
  • Aldrich C. H. Koh
    • 2
  • Serene X. T. Koh
    • 2
  • Glen J. X. Liu
    • 2
  • Amanda Q. X. Nio
    • 4
  • Priscilla W. P. Fan
    • 1
  1. 1.Combat Protection and Performance Programme, Defence Medical and Environmental Research InstituteDSO National LaboratoriesSingaporeRepublic of Singapore
  2. 2.Department of PhysiologyNational University of SingaporeSingaporeRepublic of Singapore
  3. 3.Lee Kong Chian School of MedicineNanyang Technological UniversitySingaporeRepublic of Singapore
  4. 4.Cardiff School of SportCardiff Metropolitan UniversityCardiffUK

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