The relationship between training characteristics and durability in professional cyclists across a competitive season.

This study investigated the influence of training characteristics on the fatigued power profile in professional cyclists. Data was collected from 30 under 23 professional cyclists (age: 20.1 ± 1.1 years, body mass: 69 ± 6.9 kg, height: 182.6 ± 6.2 cm, O: 73.8 ± 2.5 mL·kg·min, CP: 5.48 ± 0.38 W·kg, W´: 17.83 ± 3.57 kJ) across a competitive season and collated in to 3 periods: early-, mid- and late-season. Two power profiles (fresh and fatigued) were created from absolute (W) and relative (W·kg) 2-, 5-, and 12-min maximal mean power outputs. The fresh power profile consisted exclusively of power output values produced prior to 2000 kJ work (2MMP, 5MMP and 12MMP) while the fatigued power profile consisted of power output values produced exclusively post 2000 kJ (2MMP 5MMP and 12MMP). Training characteristics were analysed to assess their influence on the power profiles. Absolute 5MMP, 12MMP and relative 12MMP were significantly lower in late-season compared with early- and mid-season ( < 0.05). The difference in absolute 12MMP and 12MMP was significantly greater in late than in early- and mid-season. A significant relationship was found between training time below the first ventilatory threshold (Time < VT1) and improvements in absolute and relative 2MMP ( = 0.43  = 0.018 and  = 0.376  = 0.04 respectively); and between a shift towards a polarized training intensity distribution and improvements in absolute and relative 12MMP ( = 0.414  = 0.023 for both) between subsequent periods. In conclusion, there is greater variability in the fatigue power profile across a competitive season than the fresh power profile.The fatigued power profile varies throughout a competitive seasonThe difference between the fresh and fatigued power profiles is not fixed across a competitive seasonA tendency towards a polarized training intensity distribution is associated with an improvement in the fatigue power profile.