title: Aerobic high intensity one-legged interval cycling improves peak oxygen uptake in chronic obstructive pulmonary disease patients; no additional effect from hyperoxia.
abstract: The aim of the present study was to investigate whether hyperoxic aerobic high intensity one-legged interval cycling improves peak oxygen uptake (V O (2peak)) compared to normoxic training in patients with severe chronic obstructive pulmonary disease, and to evaluate the acute effect of hyperoxia during one- and two-legged peak exercise testing. Twelve COPD patients were recruited to perform 3 training sessions per week for 8 weeks in hyperoxia (n=7) or normoxia (n=5). Each leg was trained 4x4 min at 85-95% of the one-legged peak heart rate. One-legged V O (2peak) increased in the hyperoxia and normoxia training groups by 24 and 15% (16.1(13.2)-20.0(11.3) and 17.4(15.1)-20.0(6.7) mL.kg (-1).min (-1)) respectively. The corresponding increases in V O (2peak) during two-legged testing were 14% in both groups (20.1(11.5)-22.9(10.6) and 18.8(8.5)-21.4(7.3) mL.kg (-1).min (-1)). There were no differences between groups from pre- to post-training. Nor were there any differences between acute hyperoxia and normoxia at the pre- or post-peak exercise test. One-legged aerobic high intensity interval cycling significantly increases V O (2peak) in COPD patients. However, breathing supplemental oxygen during training or testing does not appear to improve V O (2peak) above the level attained by breathing ambient air.
authors.affiliation: Norwegian University of Science and Technology, Department of Circulation and Medical Imaging, Trondheim, Norway. siri.bjorgen@ntnu.no
authors.forename: S
authors.initials: S
authors.lastname: Bjørgen
authors.forename: J
authors.initials: J
authors.lastname: Helgerud
authors.forename: V
authors.initials: V
authors.lastname: Husby
authors.forename: S
authors.initials: S
authors.lastname: Steinshamn
authors.forename: R R
authors.initials: RR
authors.lastname: Richadson
authors.forename: J
authors.initials: J
authors.lastname: Hoff
mesh_terms: D000368:Aged; D001642:Bicycling; D005080:Exercise Test / Q000379:methods; D005081:Exercise Therapy / Q000379:methods*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D010102:Oxygen Inhalation Therapy / Q000379:methods; D029424:Pulmonary Disease, Chronic Obstructive / Q000503:physiopathology / Q000628:therapy*; D012720:Severity of Illness Index