PMID- 24318656
OWN - NLM
STAT- MEDLINE
DCOM- 20140925
LR  - 20220409
IS  - 1439-6327 (Electronic)
IS  - 1439-6319 (Linking)
VI  - 114
IP  - 2
DP  - 2014 Feb
TI  - Neck cooling and cognitive performance following exercise-induced hyperthermia.
PG  - 375-84
LID - 10.1007/s00421-013-2774-9 [doi]
AB  - 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  degrees 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  degrees C vs. 
      NCC: 39.6 +/- 0.3  degrees C; p = 0.15). Mean neck temperature was lowered in NCC compared 
      to CON after the run (36.4 +/- 1.6  degrees C vs. NCC: 26.0 +/- 0.3  degrees 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.
FAU - Lee, Jason K W
AU  - Lee JK
AD  - Combat Protection and Performance Programme, Defence Medical and Environmental 
      Research Institute, DSO National Laboratories, Singapore, Republic of Singapore, 
      lkaiwei@dso.org.sg.
FAU - Koh, Aldrich C H
AU  - Koh AC
FAU - Koh, Serene X T
AU  - Koh SX
FAU - Liu, Glen J X
AU  - Liu GJ
FAU - Nio, Amanda Q X
AU  - Nio AQ
FAU - Fan, Priscilla W P
AU  - Fan PW
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20131207
PL  - Germany
TA  - Eur J Appl Physiol
JT  - European journal of applied physiology
JID - 100954790
RN  - 0 (Brain-Derived Neurotrophic Factor)
SB  - IM
MH  - Adult
MH  - *Body Temperature
MH  - Brain-Derived Neurotrophic Factor/blood
MH  - Case-Control Studies
MH  - *Cognition
MH  - *Exercise
MH  - Heart Rate
MH  - Humans
MH  - Hyperthermia, Induced
MH  - *Hypothermia, Induced
MH  - Male
MH  - Memory
MH  - Neck/*physiology
MH  - Oxygen Consumption
MH  - Psychomotor Performance
EDAT- 2013/12/10 06:00
MHDA- 2014/09/26 06:00
CRDT- 2013/12/10 06:00
PHST- 2013/03/29 00:00 [received]
PHST- 2013/11/06 00:00 [accepted]
PHST- 2013/12/10 06:00 [entrez]
PHST- 2013/12/10 06:00 [pubmed]
PHST- 2014/09/26 06:00 [medline]
AID - 10.1007/s00421-013-2774-9 [doi]
PST - ppublish
SO  - Eur J Appl Physiol. 2014 Feb;114(2):375-84. doi: 10.1007/s00421-013-2774-9. Epub 
      2013 Dec 7.