During successive high-intensity cycle ergometer bouts, what intensity of VO2 max should active rest be assigned for optimal lactate clearance?

Assigning active rest at 35% of VO2 max during high-intensity cycle ergometer bouts is effective for optimal lactate clearance. This intensity level promotes blood flow and enhances the removal of lactate from the bloodstream through several physiological mechanisms. At this intensity, the body utilizes aerobic metabolism sufficiently to help oxidize lactate while maintaining a lower workload that allows for recovery without inducing additional fatigue.

Training and conditioning programs aim to manage lactate accumulation during repeated bouts of high-intensity exercise. During recovery periods, a moderate intensity like 35% of VO2 max ensures that the muscles remain engaged without reaching a level that would contribute to further strain or lactate production. This balance helps facilitate physiological processes such as increased mitochondrial activity and improved lactate threshold over time.

Choosing a significantly lower intensity, such as 10%, may not promote effective clearance since the blood flow would be less active. Conversely, higher intensities like 50% or 75% can lead to greater fatigue and increased lactate production, impeding the recovery process. Therefore, 35% provides the optimal compromise between facilitating lactate clearance and maintaining recovery during bouts of high-intensity exercise.