This study will investigate the link between glucose abnormalities and elements critical to muscle function including mass, composition and energy metabolism. the primary goal of the study is to determine whether Cystic Fibrosis (CF) disease is associated with muscle dysfunction, especially in the presence of glucose intolerance. This is a longitudinal cohort study of 3 main groups: CF subjects without Cystic Fibrosis-related diabetes (CFRD), healthy matched controls and CF subjects with newly diagnosed CFRD started on insulin therapy.
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Compare change in mean lean body mass (LBM) from baseline to end of study
Timeframe: 24 months (CF without CFRD subjects & healthy controls); 6 months for CF subjects