title: Reliability of a high-intensity cycling capacity test.
abstract: OBJECTIVE
  To assess the reliability of the CCT110%, a high-intensity cycling capacity test performed to exhaustion.
  
  
  METHODS
  27 recreationally active participants (age 23±4y; height 1.79±0.06m; body mass 78.0±8.8kg; Powermax 306±49W) performed the CCT110% on two occasions.
  
  
  METHODS
  Performance measures determined from the CCT110% were time to exhaustion (TTE) and total work done (TWD). Blood pH, lactate, bicarbonate and base excess were determined before exercise, immediately after exercise, and 5min after exercise. Exercise capacity data were analysed using intra-class correlations (ICC), systematic bias ratio, ratio limits of agreement, coefficient of variation (CV) and t-tests. Blood variables were analysed using repeated measures ANOVA and Tukey tests for post hoc comparisons.
  
  
  RESULTS
  TTE (mean±SD: 134±20s and 135±20s, P=0.75) and TWD (42.2±10.3kJ and 42.2±9.8kJ, P=0.97) were not different between trials. The ICC between trials was r=0.88 for TTE and r=0.94 for TWD, with the CV being 4.43% for TTE and 4.94% for TWD. There were no between trial differences in blood markers at any time point except immediately post-exercise pH (7.246±0.041 vs. 7.269±0.064, P=0.004).
  
  
  CONCLUSIONS
  The CCT110% is a reliable exercise protocol that can be used for nutritional interventions designed to affect intracellular and extracellular pH changes. Although blood pH was significantly different between trials immediately post-exercise, the absolute differences are much smaller than those expected to be seen using nutritional interventions intended to alter extracellular pH during exercise.
authors.affiliation: Sport, Health and Performance Enhancement (SHAPE) Research Group, School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 8NS, UK.
authors.forename: Bryan
authors.initials: B
authors.lastname: Saunders
authors.forename: Craig
authors.initials: C
authors.lastname: Sale
authors.forename: Roger C
authors.initials: RC
authors.lastname: Harris
authors.forename: John G
authors.initials: JG
authors.lastname: Morris
authors.forename: Caroline
authors.initials: C
authors.lastname: Sunderland
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D005080:Exercise Test; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D015203:Reproducibility of Results; D055815:Young Adult
chemical_list: D015415:Biomarkers; D019344:Lactic Acid