title: The spirografic oxygen deficit: its role in cardiopulmonary exercise testing.
abstract: The increase in oxygen uptake > 100 ml · min-1 during steady state exercise when elevating the inspired fractional air content (FinO2) from 0.21-1.00 defines the "spirografic oxygen deficit" (SOD). The purpose of this study was 2-fold: 1) determine the SOD at different exercise intensities in healthy participants and 2) investigate if a correlation exists among key variables of cardiopulmonary exercise testing. 12 men (24±2 yrs; 183±4 cm; 83.5±5.3 kg) performed cycle tests to determine maximal power output (Pmax), the power output at the first (PVT1) and the second ventilatory threshold (PVT2), at 4 mmol · l-1 blood lactate (P4) and lactate threshold (PLT). When cycling at 30, 40, 50, 60, 70 and 80% Pmax, the FinO2 was increased from 0.21-1.00 after 5 min to assess the power output at the SOD and at which blood lactate increased > 1 mmol∙L-1 (PLLAC). The SOD occurred at 70% Pmax accompanied by increased blood lactate concentration (p<0.01). The PSOD correlated with PLACC (p=0.05; r=0.61), but not with PVT1, PVT2, P4, or PLT (best p=0.29; highest r=0.39). In conclusion, the SOD may represent a non-invasive tool for evaluating submaximal endurance performance, especially when evaluating the peripheral contribution to performance.
authors.affiliation: Department of Sport Science, University of Wuppertal, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Sperlich
authors.forename: T
authors.initials: T
authors.lastname: Schiffer
authors.forename: U
authors.initials: U
authors.lastname: Hoffmann
authors.forename: H K
authors.initials: HK
authors.lastname: Strueder
authors.forename: W
authors.initials: W
authors.lastname: Hollmann
mesh_terms: D000328:Adult; D054874:Athletic Performance / Q000502:physiology*; D001642:Bicycling / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology; D055815:Young Adult
chemical_list: D019344:Lactic Acid