Reproducibility of relationships between human ventilation, its components and oesophageal temperature during incremental exercise

• Published in: European journal of applied physiology 2006-03, Vol.96 (5), p.495-504
• Main Authors: Sancheti, A, White, M D
• Format: Article
• Language: English
• Subjects: Adolescent; Adult; Body Temperature - physiology; Carbon Dioxide - metabolism; Esophagus - physiology; Exercise Test - methods; Exercise Test - standards; Humans; Male; Oxygen Consumption - physiology; Physical Exertion - physiology; Pulmonary Ventilation - physiology; Reproducibility of Results; Tidal Volume - physiology
• ISSN: 1439-6319; 1439-6327
• DOI: 10.1007/s00421-005-0101-9

For human exercise at intensities greater than approximately 70 to 85% of maximal levels of exertion, ventilation (V E) increases proportionately to core temperature (T C) following distinct T C thresholds. This suggested T C in humans could be a modulator of exercise-induced ventilation. This study tested the reproducibility of relationships between oesophageal temperature (T oes) ventilation and its components during incremental exercise. On two nonconsecutive days, at an ambient temperature of 22.1+/-0.3 degrees C and RH of 45+/-5%, seven untrained adult males of normal physique pedaled on a seated cycle ergometer in an incremental exercise protocol from rest to the point of exhaustion. In each exercise session, ventilatory equivalents for oxygen consumption (VE.VO2 (1-)) and carbon dioxide production (VE.VCO2 (1-)) plus the components of V E, tidal volume (V T) and frequency of respiration (f), were expressed as a function of T oes. Results indicated the reproducibility criteria of Bland and Altman were met for the relationships between T oes and both (VE.VO2 (1-)) and (VE.VCO2 (1-)) as well as for relationships between T oes and each of V T and f. Intraclass correlation coefficients (R) for between-trial T oes thresholds for (R=0.91, P