Association between peripheral muscle strength, exercise performance, and physical activity in daily life in patients with Chronic Obstructive Pulmonary Disease

Table 2 Associations with quadriceps strength

Variable	Coefficient β	95% CI	p
*Daily physical activity*
MET (kcal/24 h/kg)	0.100	-0.371 – 0.582	0.650
TEEACC (kcal/day)	0.274	-0.171 – 0.749	0.206
PAL	0.092	-0.345 – 0.516	0.684
Steps/day (n)	-0.085	-0.567 – 0.387	0.699
*Exercise performance*
6MWD (m)	0.451	0.085 – 0.835	0.018
Sit-to-Stand test (n)	0.502	0.105 – 0.857	0.015
Handgrip test (kg)	0.455	0.050 – 0.837	0.029
Time < 3METs (min)	-0.055	-0.811 - 0.434	0.822
Time 3–6 METs (min)	0.449	-0.111 – 1.010	0.080

Univariate regression is expressed as β. 6MWD, 6-minute walk distance, MET, metabolic equivalent; PAL, physical activity level; TEEACC, total energy expenditure per day as assessed by accelerometry. P < 5% is significant.

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