Shorter constant work rate cycling tests as proxies for longer tests in highly trained cyclists

Severe-intensity constant work rate (CWR) cycling tests simulate the high-intensity competition environment and are useful for monitoring training progression and adaptation, yet impose significant physiological and psychological strain, require substantial recovery, and may disrupt athlete training or competition preparation. A brief, minimally fatiguing test providing comparable information is desirable. Purpose To determine whether physiological variables measured during, and functional decline in maximal power output immediately after, a 2-min CWR test can act as a proxy for 4-min test outcomes. Methods Physiological stress ( VO2 kinetics, heart rate, blood lactate concentrations (([La (-)](b)) was monitored and performance fatigability was estimated (as pre-to-post-CWR changes in 10-s sprint power) during 2-and 4-min CWR tests in 16 high-level cyclists ( VO2 peak 1/4 64.4 +/- 6.0 ml center dot kg-1 center dot min-1). The relationship between the 2-and 4-min CWR tests and the physiological variables that best relate to the performance fatigability were investigated. Results The 2-min CWR test evoked a smaller decline in sprint mechanical power (32% vs. 47%, p < 0.001). Both the physiological variables (r = 0.66-0.96) and sprint mechanical power (r = 0.67-0.92) were independently and strongly correlated between 2-and 4-min tests. Differences in VO2 peak and [La (-)](b) in both CWR tests were strongly associated with the decline in sprint mechanical power. Conclusion Strong correlations between 2-and 4-min severe-intensity CWR test outcomes indicated that the shorter test can be used as a proxy for the longer test. A shorter test may be more practical within the elite performance environment due to lower physiological stress and performance fatigability and should have less impact on subsequent training and competition preparation.

Automated summary

The study aimed to determine whether a 2-minute constant work rate (CWR) cycling test can act as a proxy for a 4-minute test. The results showed a strong correlation between the outcomes of the 2-minute and 4-minute tests, indicating that the shorter test can be used as a substitute for the longer test. The shorter test reduces physiological stress and performance fatigability, making it more practical for elite athletes in their training and competition preparation.