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. 2018 Apr 24;13:1333–1342. doi: 10.2147/COPD.S157035

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Correlations between the levels of GDF11 and muscle strength and exercise capacity.

Notes: Correlations between the levels of plasma GDF11 and the QMVC % predicted (A) and the 6MWD (B) were investigated. r is the correlation coefficient. Data were statistically analyzed by the Spearman’s rank test. Closed circles (gray): GOLD stage I/II; closed circles (black): GOLD stage III/IV.

Abbreviations: GDF11, growth differentiation factor 11; GOLD, Global Initiative for Chronic Obstructive Lung Disease; 6MWD, 6-minute walking distance; QMVC, quadriceps maximal voluntary contraction.