Associations Between Cardiorespiratory Fitness and Arterial Stiffness in Ankylosing Spondylitis: A Cross-sectional Study

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.

From the Department of Rheumatology, and the Preventive Cardio-Rheuma Clinic, Diakonhjemmet Hospital, Oslo, Norway; the Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands. Supported by The Norwegian Rheumatism Association. I.J. Berg, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.H. Sveaas, PhD, Department of Rheumatology, Diakonhjemmet Hospital; C. Fongen, MSc, Department of Rheumatology, Diakonhjemmet Hospital; T.K. Kvien, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; H. Dagfinrud, PhD, Department of Rheumatology, Diakonhjemmet Hospital; S.A. Provan, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital; A.G. Semb, MD, PhD, Preventive Cardio-Rheuma Clinic, Department of Rheumatology, Diakonhjemmet Hospital; D. van der Heijde, MD, PhD, Department of Rheumatology, Diakonhjemmet Hospital, and Department of Rheumatology, Leiden University Medical Center. Address correspondence to Dr. I.J. Berg, Diakonhjemmet Hospital, Box 23 Vinderen, N-0319 Oslo, Norway. E-mail: ingerjoridberg@gmail.com. Accepted for publication April 6, 2018.