Lung volumes were measured by spirometry and helium-dilution technique in 28 young adult men with insulin-dependent diabetes mellitus (IDDM) of long duration and compared with 16 age- and height-matched adult men without diabetes. Reduced values for forced expiratory volume at 1 s, vital capacity, functional residual capacity, total lung capacity, residual volume, and single-breath carbon monoxide transfer factor were found for the IDDM patients compared to the control subjects. The results are consistent with reduced lung volumes in IDDM patients and did not correlate with the presence or absence of mild cheiroarthropathy but may relate to duration of diabetes.

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