Table 2.
Systemic hemodynamics during whole-body heat stress at rest and during exercise
Control |
Skin Hyperthermia |
Skin and Mild Core Hyperthermia |
Skin and Core Hyperthermia |
|||||
---|---|---|---|---|---|---|---|---|
Rest | Exercise | Rest | Exercise | Rest | Exercise | Rest | Exercise | |
Cardiac output, l/min | 5.3 ± 0.2 | 7.8 ± 0.4 | 6.9 ± 0.3* | 9.2 ± 0.4* | 8.5 ± 0.4*# | 10.2 ± 0.4*# | 9.0 ± 0.4*#† | 10.9 ± 0.5*#† |
Mean arterial pressure, mmHg | 109 ± 3 | 146 ± 2 | 103 ± 0* | 129 ± 2* | 101 ± 2*# | 120 ± 3*# | 105 ± 3† | 119 ± 3*# |
Femoral venous pressure, mmHg | 11 ± 1 | 20 ± 2 | 11 ± 2 | 20 ± 2 | 14 ± 2# | 19 ± 3 | 14 ± 3† | 18 ± 3 |
Systemic vascular conductance, ml·min−1·mmHg−1 | 49 ± 2 | 54 ± 3 | 67 ± 3* | 72 ± 4* | 84 ± 4*# | 86 ± 5*# | 86 ± 4*# | 91 ± 4*#† |
Perfusion pressure, mmHg−1 | 97 ± 3 | 125 ± 2 | 90 ± 2* | 109 ± 2* | 88 ± 3* | 101 ± 4*# | 93 ± 3* | 100 ± 3*# |
Data are means ± SE for 11 subjects. Cardiac output, mean arterial pressure, femoral venous pressure, and systemic vascular conductance during heat stress at rest and one-legged knee extensor exercise.
Different from control, P < 0.05;
different from skin hyperthermia, P < 0.05;
different from skin and mild core hyperthermia. Significance was accepted at P < 0.05 and refers to differences in the respective conditions, i.e., either rest or exercise.