Malterer, K. R., Mulder, R., Noordhof, de Konig, J. J., & Foster, C. (2013). Constant anaerobically attributable work in relation to cycle time trail length. Medicine & Science in Sports & Exercise, 45(5), Supplement abstract number 593.

This study measured aerobic and anaerobic work during cycling time-trials of 500, 1000, 2000, and 4000 m by accounting for total work accomplished and subtracting the aerobic work value. Gross efficiency was calculated based on a back extrapolation method that allows for estimation of gross efficiency changes during a time-trial. Well-trained, task habituated cyclists (N=17) performed four time-trials in random order. Anaerobic work was calculated by subtracting aerobic work from the total work accomplished. Gross efficiency was measured immediately before and after all time-trials to account for changes in gross efficiency.

Total and aerobic work grew progressively with time-trial distance, but anaerobic work did not change with increased time-trial distance.

Implication. The amount of anaerobic work in a task is a fixed value that is fully expended even during short (<60 seconds) time-trial.

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