Table 2.
Carotid body chemosensitivity
| Parameter | CW |
TN |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| PRE | D80 | D160 | PD | PD60 | Pre | D80 | D160 | PD | PD60 | |
| , L·min·mmHg−1 | 8.29 (6.38) | 10.41 (6.66) | 11.42 (9.61) | 9.88 (11.61) | 12.60 (9.40) | 9.62 (7.71) | 6.56 (2.90) | 7.09 (3.65) | 10.76 (6.02) | 11.77 (4.66) |
| HR response to hypercapnia, beats·min−1·mmHg−1 | 0.32 (0.22) | 0.40 (0.38) | 0.41 (0.43) | 0.51 (0.36) | 0.66 (0.81) | 0.19 (0.09) | 0.32 (44) | 0.26 (0.18) | 0.55 (0.61) | 0.51 (0.39) |
| MAP response to hypercapnia, mmHg·mmHg−1 | 1.11 (0.21) | 0.42 (0.19)* | 0.37 (0.13)* | 0.86 (0.56) | 0.75 (0.17)* | 0.66 (0.03)# | 0.49 (0.13)* | 0.47 (0.16)* | 0.84 (0.28) | 0.92 (0.19)*# |
| , L·min·mmHg−1 | 5.30 (2.75) | 5.17 (4.75) | 5.43 (4.29) | 7.03 (5.41) | 7.80 (4.93) | 5.93 (3.65) | 2.47 (1.45) | 3.17 (1.25) | 6.94 (3.36) | 7.27 (4.26) |
| HR response to hypoxia, beats·min−1·mmHg−1 | 149.2 (53.3) | 144.7 (52.4) | 105.8 (59.8)* | 183.1 (37.2)* | 180.4 (63.1)* | 144.0 (46.4) | 116.6 (44.7) | 135.7 (71.9) | 167.4 (68.2) | 159.2 (60.1) |
| MAP response to hypoxia, mmHg·mmHg−1 | 362.0 (61.1) | 311.2 (92.3) | 228.2 (90.2) | 286.8 (66.5)* | 240.9 (65.7)* | 358.9 (60.9) | 284.4 (65.3)* | 269.5 (94.8)* | 297.4 (88.4) | 277.0 (46.3)* |
Values are presented as mean (SD); n = 13 (all males). Carotid body chemosensitivity to hypercapnia () and carotid body chemosensitivity to hypoxia () values were multiplied by a factor of 100 for readability. CW, cold water; D80 and D160, 80 and 160 min into the dive; HR, heart rate; MAP, mean arterial pressure; PD, postdive; PD60, 60 min postdive; PRE, predive; TN, thermoneutral water. Two-way repeated-measures analysis of variance (time × water temperature). If a significant interaction or main effect was found, post hoc multiple comparisons were completed with the least squared differences (LSD) procedure. *P < 0.05 from pre-dive; #P ≤0.05 CW vs. TN.