Sleep Duration and Efficiency Associated With Better Functional Exercise Capacity in Black Smokers at Risk for COPD

Background Black smokers have earlier development of lung disease as well as poorer sleep health than whites. Research Question In a sample of black smokers, to what extent does sleep health modify the association between smoking level and functional exercise capacity? Design and Methods Cross-sectional data from 209 black smokers (≥ 1 cigarette in last month), aged 40 to 65 years with no evidence of sleep-disordered breathing (apnea-hypopnea...