title: Modeling the relationship between velocity and time to fatigue in rowing.
abstract: BACKGROUND
  Several mathematical models describe the relationship between velocity and time to fatigue.
  
  
  OBJECTIVE
  The purposes of this study were to evaluate different critical velocity (V(critical)) models applied to rowing ergometry and to investigate prediction of performance time in a 2000-m race based on results from shorter trials.
  
  
  METHODS
  Sixteen men performed seven rowing ergometer tests. Velocity and time to fatigue data from the 200-m (approximately 0.5 min) to 1200-m (approximately 3 min) trials and from the 200-m to 2000-m (approximately 6.5 min) trials were fit to a two-parameter hyperbolic model, a three-parameter hyperbolic model, and a three-parameter exponential model.
  
  
  RESULTS
  Including data from the 2000-m trial generally resulted in higher R2 and smaller SEE. V(critical) from the three versions of the two-parameter model were 4.71 +/- 0.28 m x s(-1), 4.80 +/- 0.27 m x s(-1), and 5.04 +/- 0.24 m x s(-1) (P < 0.001). The two three-parameter models had high R2 (0.991 and 0.990, respectively) and generated parameter estimates that appeared reasonable. Time for a 2000-m race was predicted better using the two-parameter model (r > 0.974) than using the three-parameter models (r = 0.820-0.870).
  
  
  CONCLUSIONS
  It is necessary to include the relatively long 2000-m predicting trial to describe accurately the velocity-time relationship in rowing. The two-parameter model may be useful in predicting time for a 2000-m race but is not otherwise appropriate for modeling when predicting trials of <1 min duration are included. Choice of model and duration of trials must be considered when using mathematical modeling to derive V(critical) and other parameters in rowing.
authors.affiliation: Department of Kinesiology, Health Promotion, and Recreation, University of North Texas, Denton 76203-0769, USA. dhill@unt.edu
authors.forename: David W
authors.initials: DW
authors.lastname: Hill
authors.forename: Catherine
authors.initials: C
authors.lastname: Alain
authors.forename: Michael D
authors.initials: MD
authors.lastname: Kennedy
mesh_terms: D000328:Adult; D005080:Exercise Test / Q000592:standards*; D017079:Exercise Tolerance / Q000502:physiology*; D005221:Fatigue; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008297:Male; D015233:Models, Statistical; D009068:Movement / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology; D015203:Reproducibility of Results; D013177:Sports / Q000502:physiology*; D013997:Time Factors