TABLE 3

Relationships between energy expenditure/physical activity and clinical parameters

	TEE_DLW		PAL_DLW
	r	p-value	r	p-value
Age years	-0.361	<0.05	0.132	ns
mMRC	0.217	ns	0.276	ns
CAT	0.282	ns	0.213	ns
BMI kg·m⁻²	0.623	<0.0001	0.158	ns
Fat mass %	0.005	ns	0.092	ns
FFMI kg·m⁻²	0.655	<0.0001	0.226	ns
SMI kg·m⁻²	0.593	<0.001	0.156	ns
Grip strength kg	0.689	<0.0001	0.538	<0.001
P_Emax %	0.255	ns	0.188	ns
P_Imax %	0.020	ns	0.280	ns
Vital capacity %	0.359	<0.05	0.301	ns
FEV₁%	0.313	ns	0.394	<0.05
FEV₁/FVC %	0.143	ns	0.286	ns
Residual volume %	0.165	ns	0.134	ns
D_LCO/V_A%	0.387	<0.05	0.258	ns
LAA %	-0.334	<0.05	-0.275	ns
6MWD m	0.355	<0.05	0.575	<0.001
ΔS_pO₂ %	0.056	ns	0.142	ns
ΔHR beats·min⁻¹	0.330	<0.05	0.520	<0.01
Dyspnoea	0.048	ns	0.009	ns
Leg fatigue	-0.322	<0.05	-0.269	ns

TEE: total energy expenditure; DLW: doubly labelled water; PAL_DLW: physical activity level using TEE_DLW; mMRC: modified Medical Research Council dyspnoea scale; CAT: COPD Assessment Test; BMI: body mass index; FFMI: fat-free mass index; SMI: skeletal muscle mass index; P_Emax: maximum expiratory pressure; P_Imax: maximum inspiratory pressure; FEV₁: forced expiratory volume in 1 s; FVC: forced vital capacity; D_LCO: diffusing capacity of the lung for carbon monoxide; V_A: alveolar volume; LAA: low attenuation area; 6MWD: 6-min walk distance; S_pO₂: percutaneous oxygen saturation; HR: heart rate; ns: nonsignificant.