Table 2. Cardiovascular responses and body temperature during simulation of daily home-delivery work in summer and winter.
| AM | PM | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rest1 | i1 | i5 | Rec1 | Rest2 | i6 | i10 | Rec2 | End | ||
| PR (pulses/min) | S | 74 (3) | 78 (3) | 75 (2) | 76 (3)¶ | 81 (3) | 88 (3) | 82 (3) | 80 (3) | 74 (3)¶ |
| W | 75 (4) | 73 (1) | 71 (2) | 73 (2) | 77 (3) | 77 (2) | 77 (3) | 74 (2) | 72 (3) | |
| SBP (mmHg) | S | 130 (6) | 126 (7) | 119 (4) | 123 (6) | 125 (7) | 126 (8) | 128 (5) | 126 (4) | 129 (6) |
| W | 121 (6) | 118 (4) | 123 (5) | 115 (4) | 115 (4) | 129 (5) | 122 (6) | 114 (3)* | 108 (5)* | |
| DBP (mmHg) | S | 70 (5) | 71 (5) | 65 (4) | 71 (3) | 70 (4) | 74 (4) | 69 (2) | 74 (3) | 68 (3) |
| W | 73 (5) | 76 (4) | 72 (4) | 68 (4) | 67 (3) | 72 (4) | 70 (6) | 69 (5) | 65 (3) | |
| PP (mmHg) | S | 60 (2) | 55 (3) | 55 (4) | 52 (5) | 55 (4) | 52 (7) | 59 (4) | 52 (3) | 61 (6) |
| W | 48 (2)* | 43 (2)* | 51 (3) | 47 (5) | 48 (3)* | 57 (3) | 52 (6)* | 44 (3)* | 43 (5)* | |
| MAP (mmHg) | S | 90 (5) | 89 (5) | 83 (4) | 88 (3) | 88 (5) | 92 (5) | 89 (2) | 91 (3) | 88 (3) |
| W | 89 (5) | 90 (4) | 89 (4) | 84 (3) | 83 (3) | 91 (4) | 87 (6) | 84 (4) | 79 (2) | |
| Tsk (°C) | S | 34.1 (0.3) | 34.2 (0.5) | 34.3 (0.6) | 33.6 (0.4) | 34.0 (0.4) | 34.6 (0.5) | 34.5 (0.7) | 33.7 (0.3) | 34.0 (0.3) |
| W | 34.0 (0.1) | 32.0 (0.2)*# | 33.7 (0.3) | 33.1 (0.2) | 34.2 (0.1) | 33.5 (0.3) | 34.4 (0.1) | 33.5 (0.2) | 33.5 (0.2) | |
| Tes (°C) | S | 37.0 (0.1) | 37.6 (0.1)# | 37.3 (0.1) | 37.5 (0.1)# | 37.2 (0.1) | 37.4 (0.1)# | 37.4 (0.1)# | 37.4 (0.1)# | 37.1 (0.2) |
| W | 36.7 (0.1)* | 37.9 (0.2)# | 37.0 (0.3) | 36.6 (0.3)* | 36.8 (0.1) | 37.5 (0.2)#$ | 37.1 (0.2) | 37.0 (0.2) | 36.9 (0.1) | |
Values are mean (SE) for 6 subjects during the simulation of home-delivery tasks in summer (S) and winter (W). PR: pulse rate; SBP & DBP: systolic and diastolic blood pressure; PP: pulse pressure; MAP: mean arterial pressure; Tes & Tsk: esophageal and mean skin temperatures; AM: morning; PM: afternoon; Before: 80 min after breakfast and before first entry to the chamber in the morning; Rest1 & 2: at rest in the chamber just before driving the truck in AM and PM, respectively; i1, 5, 6, & 10: at rest just after 1st, 5th, 6th and 10th walking with 5-kg plate, respectively; Rec1 & 2: recovery just after returning to the laboratory in AM and PM, respectively; End: at the end of experiment. *A significant difference between S and W; #relative to Rest1; $relative to Rest2; §relative to Before; ¶relative to i6 at the level of p<0.05.