Heat stress had no effect ( P ≥ 0.09) on RVP or CRT accuracy in either group. During heat stress, RVP reaction time improved ( P < 0.01) in both groups. For tests that measured attention, reaction time during RVP and CRT was slower ( P ≤ 0.01) in the older group. Testing was undertaken on two occasions during each trial, at baseline and after internal temperature had increased by 1.0 ± 0.2☌ or after a time control period. Cognitive tests (outcomes: accuracy and reaction time) from the CANTAB battery evaluated attention, memory, and executive function. In a randomized, crossover design, 15 older (age: 69 ± 5 yr) and 14 younger (age: 30 ± 4 yr) healthy subjects underwent passive heat stress and time control trials. We tested the hypothesis that attention, memory, and executive function are impaired to a greater extent in passively heat-stressed older adults than in passively heat-stressed younger adults.
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