Table 2.

Cardiovascular and sympathetic responses to whole body cooling

	Mean Tsk 34.0°C	Mean Tsk 30.5°C	Δ
Systolic BP, mmHg
Young	120 ± 3	125 ± 3†	5 ± 2
Older	122 ± 3	136 ± 4*†	14 ± 2*
Diastolic BP, mmHg
Young	72 ± 2	79 ± 2†	7 ± 1
Older	76 ± 2	81 ± 3†	6 ± 1
Heart rate, beats/min
Young	59 ± 2	59 ± 3	0 ± 2
Older	59 ± 2	59 ± 2	0 ± 1
Burst incidence, bursts/100 beats
Young	21 ± 5	22 ± 5	1 ± 2
Older	46 ± 4*	58 ± 4*†	12 ± 2*
Total MSNA, AU/beat
Young	15.1 ± 2.5	15.0 ± 2.4	−0.1 ± 0.8
Older	28.6 ± 2.3*	39.9 ± 3.3*†	11.4 ± 2.7*
Total activity, AU/min
Young	840 ± 124	828 ± 118	−12 ± 51
Older	1,623 ± 115*	2,459 ± 186*†	836 ± 161*

Values are means ± SE.

T_sk, skin temperature; AU, arbitrary units.

^*P < 0.05 vs. young;

^†P < 0.05 vs. mean T_sk 34.0°C.