Table 1 Anthropometric data, pulmonary function, normoxic resting ventilation and hypoxic ventilatory response (HVR) in non-smokers (NSM) and smokers (SM)

Cigarettes per day

(n d⁻¹)

-

-

Pack years^b

(years)

-

-

Age

(years)

32.7 ± 1.7

0.644

Body weight

(kg)

78.8 ± 2.5

0.632

Body height

(m)

1.80 ± 1.7

0.655

BMI

(kg m⁻²)

24.2 ± 0.6

0.980

RR systolic

(mmHg)

124.5 ± 1.9

0.055

RR diastolic

(mmHg)

79.0 ± 1.9

0.93

VC

(l)

5.2 ± 0.2

0.847

VC _relative

(%)

95.9 ± 3.9

0.870

FVC _relative

(%)

108 ± 4

0.535

FEV1_%VC

(%)

78.9 ± 2.0

0.803

FEV1 _relative

(%)

106.8 ± 4.8

0.407

FEV1_%VCrelative

(%)

97.7 ± 2.7

0.744

Ventilation

(l min⁻¹)

9.2 ± 0.3

0.006^c

Tidal volume

(ml)

828 ± 56

0.264

Respirat. frequency

(min⁻¹)

12.2 ± 1.0

0.078

PetCO₂

(mmHg)

39.3 ± 0.5

0.957

PetO₂

(mmHg)

101.4 ± 1.1

0.218

VCO₂

(ml min⁻¹)

253 ± 8

0.058

VO₂

(ml min⁻¹)

304 ± 8

0.268

RQ

(ratio)

0.83 ± 0.01

0.088

SaO₂

(%)

99.1 ± 0.2

0.705

HVR

(l min⁻¹ %⁻¹)

0.89 ± 0.08

0.003^c

HVR ^a BMI⁻¹

(l min⁻¹ %⁻¹kg⁻¹ m⁻²)

0.037 ± 0.003

0.002^c

PetCO_{2 HVR}

(mmHg)

38.8 ± 0.4

0.959