To determine whether the intensity of prior work is an important contributing factor to the downward shift in the power-duration relationship. Data were collected from 14 professional cyclists (height 176.3 cm ± 7, body mass 67.3 kg ± 5, CP, 5.3 W·kg-1 ± 0.21). Participants conducted a power profile test three times consisting of a 15s, a 3 min and a 12 min maximal effort trial utilizing a standardized climb. On the first occasion, the power profile test was conducted in a fresh state (Fresh), the subsequent power profile tests were conducted after two different fatiguing protocols: ~2000 kJ of work at <70% of CP (low-intensity continuous (LIC)) and following a novel fatiguing protocol consisting of 5 × 8 min at 105%-110% of CP (HI). Participants conducted significantly less work in HI compared with LIC, however, 1 and 15s power were significantly lower post-HI than LIC. The 3-min power output was significantly lower post-HI than Fresh but not significantly lower in LIC than Fresh. The 12-min power output and CP were not significantly different between conditions. These findings demonstrate the importance of the intensity of prior work in the resultant downward shift in the power-duration relationship, especially for shorter-duration efforts and suggest that the total amount of work done is alone not sufficient to describe prior work.
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