Table 4 Cardiovascular variables
Outcomes | Author and year | Duration of exposure (h:min) | Hypobaric hypoxia result [mean (SD)] | Normobaric hypoxia result [mean (SD)] | Difference (HH − NH) | P value | Direction of difference NH compared to HH |
|---|---|---|---|---|---|---|---|
Hypoxic cardiac response (HCR) bpm %−1 |  |  |  |  |  |  |  |
|  | Savourey 2007 | 00:10 builda, 00:05 | −0.61 | −0.63 | 0.02 | >0.05 | NS |
Savourey 2007 | 00:10 builda, 00:30 | −0.52 | −0.79 | 0.27 | >0.05 | NS | |
LF/HF% | Â | Â | Â | Â | Â | Â | Â |
|  | Basualto-Alarcon 2012 | 00:15 builda, 00:10 acclimatisation | 1.96 (2.6) | 1.28 (0.92) | 0.68 | <0.05 | HH > NH |
HR | Â | Â | Â | Â | Â | Â | Â |
|  | Self 2011 | 00:01 | 104.9 (14.3) | 96.6 (14.6) | 8.3 | <0.05 | HH > NH |
Self 2011 | 00:04 | - | - | - | >0.05 | NS | |
Basualto-Alarcon 2012 | 00:15 builda, 00:05 acclimatisation | 61 (9) | 62 (6) | −1 | - | - | |
Basualto-Alarcon 2012 | 00:15 builda, 00:10 acclimatisation | 129 (23) | 134 (16) | −5 | <0.05 | NH > HH | |
Savourey 2007 | 00:10 builda, 00:05 | 70.32 (9.91) | 69.62 (9.95) | Â | >0.05 | NS | |
Savourey 2003 | 00:10 builda, 00:30 | - | - | - | <0.05 | HH > NH | |
Savourey 2007 | 00:10 builda, 00:30 | 69.50 (12.07) | 70.67 (12.07) | - | >0.05 | NS | |
Faiss 2013 | 01:00 | 62 (8) | 63 (10) | −1 | >0.05 | NS | |
Miyagawa 2010 | 01:05 | 144 | 137 | - | >0.05 | NS | |
Miyagawa 2010 | 01:10 | 150 | 146 | - | >0.05 | NS | |
Miyagawa 2010 | 01:40 | 166 | 164 | - | >0.05 | NS | |
Tucker 1983a | 02:20 including 00:15 builda | 10.4 | 3.6 | 6.8 | - | HH > NH | |
Faiss 2013 | 08:00 | 68 (13) | 69 (13) | −1 | >0.05 | NS | |
Faiss 2013 | 16:00 | 61 (10) | 66 (7) | −5 | >0.05 | NS | |
Faiss 2013 | 24:00 | 65 (9) | 71 (10) | −6 | >0.05 | NS | |
Stroke volume | Â | Â | Â | Â | Â | Â | Â |
|  | Miyagawa 2010 | 01:05 | 105 | 107 | −2 | >0.05 | NS |
Miyagawa 2010 | 01:10 | 113 | 126 | −13 | >0.05 | NS | |
Miyagawa 2010 | 01:40 | 116 | 124 | −8 | >0.05 | NS | |
Cardiac output | Â | Â | Â | Â | Â | Â | Â |
| Â | Miyagawa 2010 | 01:05 | 15.3 | 14.7 | Â | >0.05 | NS |
Miyagawa 2010 | 01:10 | 17.1 | 18.2 | Â | >0.05 | NS | |
Miyagawa 2010 | 01:40 | 19.4 | 20.1 | Â | >0.05 | NS | |
Mean BP | Â | Â | Â | Â | Â | Â | Â |
| Â | Miyagawa 2010 | 01:05 | 112 | 107 | Â | >0.05 | NS |
Miyagawa 2010 | 01:10 | 108 | 107 | Â | >0.05 | NS | |
Miyagawa 2010 | 01:40 | 100 | 99 | Â | >0.05 | NS | |
BP systolic (Torr) | Â | Â | Â | Â | Â | Â | Â |
|  | Faiss 2013 | 01:00 | 124 (9) | 129 (13) | −5 | >0.05 | NS |
Tucker 1983b | 02:20 including 00:15 builda | −1 | 5 | −6 |  | NH > HH | |
Faiss 2013 | 08:00 | 124 (9) | 123 (7) | 1 | >0.05 | NS | |
Faiss 2013 | 16:00 | 121 (9) | 118 (9) | 3 | >0.05 | NS | |
Faiss 2013 | 24:00:00 | 131 (10) | 129 (9) | 2 | >0.05 | NS |