Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 3597-3606 |
| Number of pages | 10 |
| Journal | European Journal of Applied Physiology |
| Volume | 112 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2012 |
| Externally published | Yes |
Cite this
}
Exertional thermal strain, protective clothing and auxiliary cooling in dry heat: evidence for physiological but not cognitive impairment. / Caldwell, Joanne N.; Patterson, Mark J; Taylor, Nigel A S.
In: European Journal of Applied Physiology, Vol. 112, No. 10, 2012, p. 3597-3606.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Exertional thermal strain, protective clothing and auxiliary cooling in dry heat: evidence for physiological but not cognitive impairment
AU - Caldwell, Joanne N.
AU - Patterson, Mark J
AU - Taylor, Nigel A S
PY - 2012
Y1 - 2012
N2 - Individuals exposed to extreme heat may experience reduced physiological and cognitive performance, even during very light work. This can have disastrous effects on the operational capability of aircrew, but such impairment could be prevented by auxiliary cooling devices. This hypothesis was tested under very hot-dry conditions, in which eight males performed 2 h of low-intensity exercise ( 30 W) in three trials, whilst wearing biological and chemical protective clothing: temperate (control: 20 degrees C, 30 relative humidity) and two hot-dry trials (48 degrees C, 20 relative humidity), one without (experimental) and one with liquid cooling (water at 15 degrees C). Physiological strain and six cognitive functions were evaluated (MiniCog Rapid Assessment Battery), and participants drank to sustain hydration state. Maximal core temperatures averaged 37.0 degrees C (+/-0.1) in the control trial, and were significantly elevated in the experimental trial (38.9 degrees C +/- 0.3; P <0.05). Similarly, heart rates peaked at 92 beats min(-1) (+/-7) and 133 beats min(-1) (+/-4; P <0.05), respectively. Liquid cooling reduced maximal core temperatures (37.3 degrees C +/- 0.1; P <0.05) and heart rates 87 beats min(-1) (+/-3; P <0.05) in the heat, such that neither now differed significantly from the control trial (P > 0.05). However, despite inducing profound hyperthermia and volitional fatigue, no cognitive degradation was evident in the heat (P > 0.05). Since extensive dehydration was prevented, it appears that thermal strain in the absence of dehydration may have minimal impact upon cognitive function, at least as evaluated within this experiment.
AB - Individuals exposed to extreme heat may experience reduced physiological and cognitive performance, even during very light work. This can have disastrous effects on the operational capability of aircrew, but such impairment could be prevented by auxiliary cooling devices. This hypothesis was tested under very hot-dry conditions, in which eight males performed 2 h of low-intensity exercise ( 30 W) in three trials, whilst wearing biological and chemical protective clothing: temperate (control: 20 degrees C, 30 relative humidity) and two hot-dry trials (48 degrees C, 20 relative humidity), one without (experimental) and one with liquid cooling (water at 15 degrees C). Physiological strain and six cognitive functions were evaluated (MiniCog Rapid Assessment Battery), and participants drank to sustain hydration state. Maximal core temperatures averaged 37.0 degrees C (+/-0.1) in the control trial, and were significantly elevated in the experimental trial (38.9 degrees C +/- 0.3; P <0.05). Similarly, heart rates peaked at 92 beats min(-1) (+/-7) and 133 beats min(-1) (+/-4; P <0.05), respectively. Liquid cooling reduced maximal core temperatures (37.3 degrees C +/- 0.1; P <0.05) and heart rates 87 beats min(-1) (+/-3; P <0.05) in the heat, such that neither now differed significantly from the control trial (P > 0.05). However, despite inducing profound hyperthermia and volitional fatigue, no cognitive degradation was evident in the heat (P > 0.05). Since extensive dehydration was prevented, it appears that thermal strain in the absence of dehydration may have minimal impact upon cognitive function, at least as evaluated within this experiment.
UR - http://www.ncbi.nlm.nih.gov/pubmed/22328005
U2 - 10.1007/s00421-012-2340-x
DO - 10.1007/s00421-012-2340-x
M3 - Article
VL - 112
SP - 3597
EP - 3606
JO - European Journal of Applied Physiology
JF - European Journal of Applied Physiology
SN - 1439-6319
IS - 10
ER -