Day-to-day variability of and interrelationships between three anaerobic ergometer tests
Knowledge of the magnitude of error in any test measure is important in judging the relative significance of that measure. The purpose of this investigation was to determine the day-to-day variability of, and interrelationships between, three anaerobic ergometer tests. The three tests examined were 30 second sprint bouts on a hydraulically-braked Fitron ergometer, 60 second sprint bouts using this same ergometer, and timed rides to exhaustion at a workload corresponding to 125% VO max. A total of twenty-seven subjects were assigned at random to perform four trials of one of these tests at one week intervals. An additional nine subjects performed one trial of each test. The mean coefficients of variation (CVQ SD x 100%) for the performance measures (mean tolerance power or ride time) were 5.4%. 5.47., and 5.37% for the 30 second, 60 second, and exhaustive tests respectively. The mean CV for 10 minute post blood lactate were 11.0%., 13.9%, and 11.0% for these same tests. The mean CV for peak torque and fatiguability were 6.7 and 10.37 for the 30 second test and 5.67% and 7.5% for the 60 second test. Mean power during the 30 second and 60 second tests were significantly related (r=0.69, p<0.05) l but these measures were not correlated with time to exhaustion. Exhaustive time was, however, significantly related to ten minute post exercise lactate concentration (r=0.91, p<0.01). It was concluded that the biological variability of anaerobic tests is similar in magnitude to that reported for measures of aerobic fitness (VO max). These data also indicate that the exhaustive test is a measure of relative, but not absolute, anaerobic tolerance.