Daily Chronic Intermittent Hypobaric Hypoxia Does Not Induce Chronic Increase in Pulmonary Arterial Pressure Assessed by Echocardiography

Table 1

Baseline characteristics.

Matched characteristics	CIHH	Controls	value
Total subject number, n	8	8
Female, n	4	4
Age, years median (min; max)	34 (29; 50)	34.5 (28; 51)
BMI, kg/m^2 (±SD)	25.30 ± 3.78	23.90 ± 6.19	0.57
Smoking (current/ex/never)	2/2/4	0/1/7	0.21
Packyears
Current	8; 16
Ex-smoker	0.5; 2	12
Endurance sport activity (regular/sometimes/rarely)	2/6/0	2/5/1	0.58
Treated hypertension, n	2	2
Treated hypothyreosis, n	0	1	>0.99
Duration of CIHH, years		—
(i) Median (min; max)	3.7 (2.5; 20)
(ii) Individual values	2.5, 3, 3.2, 3.4, 4, 5, 10, 20

CIHH: chronic intermittent hypobaric hypoxia; by t-test or chi-square test as appropriate. Endurance physical activity was defined as cardiac workout of at least 30 min: regular >1/week; sometimes 1–3x/month; rarely <1/month.