PULMONARY REHABILITATIONVitamin D Status in Patients With Chronic Obstructive Pulmonary Disease Who Participate in Pulmonary RehabilitationRingbaek, Thomas MD, MDSci; Martinez, Gerd PT; Durakovic, Amal MD; Thøgersen, Jane RN; Midjord, Anne-Kirsten RN; Jensen, Jens-Erik Beck MD, PhD; Lange, Peter MD, MDSciAuthor Information Department of Cardiology and Respiratory Medicine (Drs Ringbaek and Lange and Mss Martinez, Midjord, and Thøgersen), Department of Endocrinology (Dr Jensen), and Department of Cardiology and Respiratory Medicine (Dr Durakovic), University Hospital, Hvidovre, Denmark. Dr Durakovic is currently affiliated with the Department of Respiratory Medicine, University Hospital, Aarhus, Denmark. Correspondence: Thomas Ringbaek, MDSci, Department of Cardiology and Respiratory Medicine, University Hospital, Hvidovre, Denmark 2650 (Ringbaek@dadlnet.dk). Journal of Cardiopulmonary Rehabilitation and Prevention: July/August 2011 - Volume 31 - Issue 4 - p 261-267 doi: 10.1097/HCR.0b013e31821c13aa Buy Metrics Among 311 chronic obstructive pulmonary disease patients who participated in a 7-week rehabilitation program, 46.0% had vitamin D level ≤50 nM and 19.6% had Vitamin D level ≤25 nM. Low vitamin D levels were associated with 2-3 times higher drop out rates from rehabilitation and poorer improvement in endurance shuttle walking time. © 2011 Lippincott Williams & Wilkins, Inc.