Fig. 1.

Internal temperature during cognitive testing in younger (n = 14) and older (n = 15) subjects during heat stress and time control trials at baseline (left) and during heat stress (i.e., heat) and following a time control period (i.e., control; right). Top: temporal changes in internal temperature across the six cognitive tests independent of the test being undertaken. Bottom: internal temperature during each cognitive test. Data are presented as means ± SD. VAS, visual analog scales; CRT, choice reaction time test; RVP, rapid visual processing test; PRM, pattern recognition memory test, SSP, spatial span test; OTS, one touch stockings of Cambridge test. ∝Significantly different from time control trial (P < 0.001). ϕSignificant increase over time (P < 0.001).