Durability in Junior Cyclists After Work Above Critical Power: Implications for Talent Identification

Area of Science:

• Sports Science
• Exercise Physiology
• Cycling Performance

Background:

• Durability, the capacity to maintain performance above critical power (CP), is crucial for elite cyclists but underexplored in juniors.
• Talent identification in junior cycling requires understanding durability's role in performance.

Purpose of the Study:

• Compare physiological profiles and high-intensity durability between international-level junior cyclists (ILG) and national-level junior cyclists (NLG).
• Establish normative values for durability to aid in junior talent detection.

Main Methods:

• Evaluated 46 male junior cyclists (ILG, n=20; NLG, n=26) over one season.
• Measured critical power (CP), maximal aerobic power, and power-output decay after high-intensity efforts (25-200 kJ).
• Utilized field data across durations from 5 seconds to 30 minutes; analyzed group differences using t-tests and linear mixed models.

Main Results:

• ILG exhibited significantly higher CP, maximal aerobic power, and time above CP compared to NLG.
• NLG showed greater durability in short, high-intensity efforts (lower decay at 1 minute).
• ILG demonstrated superior durability in prolonged efforts (lower decay at 5-30 minutes), indicating better endurance capacity.

Conclusions:

• Higher aerobic capacity and sustained durability in prolonged efforts distinguish elite junior cyclists.
• Durability after intense work above CP serves as a valuable talent marker for junior cyclists.
• Normative percentage-of-decay values offer benchmarks for effective junior talent identification in cycling.