title: The effect of different exercise protocols and regression-based algorithms on the assessment of the anaerobic threshold.
abstract: The purpose of this study was to examine the effect of ramp and step incremental cycle ergometer tests on the assessment of the anaerobic threshold (AT) using 3 different computerized regression-based algorithms. Thirteen healthy adults (mean age and body mass [SD] = 23.4 [3.3] years and body mass = 71.7 [11.1] kg) visited the laboratory on separate occasions. Two-way repeated measures analyses of variance with appropriate follow-up procedures were used to analyze the data. The step protocol resulted in greater mean values across algorithms than the ramp protocol for the V[Combining Dot Above]O2 (step = 1.7 [0.6] L·min and ramp = 1.5 [0.4] L·min) and heart rate (HR) (step = 133 [21] b·min and ramp = 124 [15] b·min) at the AT. There were no significant mean differences, however, in power outputs at the AT between the step (115.2 [44.3] W) and the ramp (112.2 [31.2] W) protocols. Furthermore, there were no significant mean differences for V[Combining Dot Above]O2, HR, or power output across protocols among the 3 computerized regression-based algorithms used to estimate the AT. The current findings suggested that the protocol selection, but not the regression-based algorithms can affect the assessment of the V[Combining Dot Above]O2 and HR at the AT.
authors.affiliation: 1Department of Exercise Science, Creighton University, Omaha, Nebraska; 2Human Performance Laboratory, Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska; and 3Department of Exercise and Sport Science, University of Wisconsin-La Crosse, La Crosse, Wisconsin.
authors.forename: Jorge M
authors.initials: JM
authors.lastname: Zuniga
authors.forename: Terry J
authors.initials: TJ
authors.lastname: Housh
authors.forename: Clayton L
authors.initials: CL
authors.lastname: Camic
authors.forename: Haley C
authors.initials: HC
authors.lastname: Bergstrom
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Schmidt
authors.forename: Glen O
authors.initials: GO
authors.lastname: Johnson
mesh_terms: D000328:Adult; D000465:Algorithms; D015308:Anaerobic Threshold / Q000502:physiology*; D000704:Analysis of Variance; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D010101:Oxygen Consumption; D012044:Regression Analysis; D055815:Young Adult