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Bivariate (A–B) and partial correlations (C–D) between knee muscle strength, endurance and walking distance in COPD.
†Correlation between metres walked on the 6MWT and isokinetic knee endurance (J) while controlling for knee strength (Nm).
‡Correlation between metres walked on the 6MWT and isokinetic knee strength (Nm) while controlling for knee endurance (J).
6MWT=6-minute walk test (distance); Nm=Newton metres; COPD=chronic obstructive pulmonary disease; J=joules.
