Hill, D. W.Vingren, J. L.Nakamura, F. Y.Kokubun, Eduardo [UNESP]2014-05-202014-05-202011-07-01International Journal of Sports Medicine. Stuttgart: Georg Thieme Verlag Kg, v. 32, n. 7, p. 519-522, 2011.0172-4622http://hdl.handle.net/11449/41887The purpose of this study was to evaluate the effect of using different mathematical models to describe the relationship between treadmill running speed and time to exhaustion. All models generated a value for an aerobic parameter (critical speed; S(critical)). 35 university students performed 5-7 constant-speed 0%-slope treadmill tests at speeds that elicited exhaustion in similar to 3 min to similar to 10 min. Speed and time data were fitted using 3 models: (1) a 2-parameter hyperbolic model; (2) a 3-parameter hyperbolic model; and (3) a hybrid 3-parameter hyperbolic + exponential model. The 2-parameter model generated values for S(critical) (mean (+/- SD): 186 +/- 33 m.min(-1)) and anaerobic distance capacity (ADC; 251 +/- 122 m) with a high level of statistical certainty (i.e., with small SEEs). The 3-parameter models generated parameter estimates that were unrealistic in magnitude and/or associated with large SEEs and little statistical certainty. Therefore, it was concluded that, for the range of exercise durations used in the present study, the 2-parameter model is preferred because it provides a parsimonious description of the relationship between velocity and time to fatigue, and it produces parameters of known physiological significance, with excellent confidence.519-522engaerobicanaerobiccritical powercritical velocitymathematicalmodelArtigo10.1055/s-0031-1275298WOS:000292332700006Acesso restrito0000-0002-9404-3444