Table 2.

Physiological data immediately prior to commencing each cognitive test battery

	Heat Stress Trial		Time Control Trial
	Younger	Older	Younger	Older
Baseline
Internal temperature, °C	36.9 ± 0.2∝	37.0 ± 0.4	37.0 ± 0.2	37.0 ± 0.3
Mean skin temperature, °C	34.2 ± 0.4	33.9 ± 0.5	34.1 ± 0.2	33.8 ± 0.4
Internal-to-skin temperature gradient, °C	2.6 ± 0.4	3.1 ± 0.5*	2.9 ± 0.9	3.2 ± 0.6
Heart rate, bpm	67 ± 10	68 ± 9	67 ± 11	69 ± 14
Mean arterial pressure, mmHg	86 ± 12	93 ± 10	87 ± 14	94 ± 9
Heat/Control
Internal temperature, °C	38.0 ± 0.2†∝	37.9 ± 0.3†∝	37.1 ± 0.2	37.0 ± 0.3
Mean skin temperature, °C	38.3 ± 0.6†∝	38.4 ± 0.6†∝	34.6 ± 0.3†	34.2 ± 0.4†*
Internal-to-skin temperature gradient, °C	−0.3 ± 0.6†∝	−0.4 ± 0.7†∝	2.5 ± 0.4	2.8 ± 0.5†
Heart rate, bpm	100 ± 12†∝	100 ± 16†∝	66 ± 13	67 ± 9
Mean arterial pressure, mmHg	80 ± 12	91 ± 11	86 ± 13	98 ± 10

Values are expressed as means ± SD.

^*Significantly different from younger within trial at same time point (P ≤ 0.022).

^†Significantly different from baseline within trial and age group (P ≤ 0.021).

^∝Significantly different from time control trial at same time point (P ≤ 0.033).