The effects of constant vs. variable workload cycling on performance and perception.

Area of Science:

• Exercise Physiology
• Sports Science
• Cycling Performance

Background:

• Understanding the physiological and psychological impacts of different cycling protocols is crucial for optimizing training.
• Constant load (CL) and variable load (VL) cycling represent distinct training modalities.

Purpose of the Study:

• To compare the physiological and psychological responses to CL versus VL cycling.
• To determine the effect of these cycling protocols on subsequent 10-km time trial performance.

Main Methods:

• Eight recreationally-trained male cyclists completed two 63-minute cycling trials: VL (alternating 3 min at 45% and 3 min at 85% maximal aerobic power) and CL (constant 65% maximal aerobic power).
• Total work was equated between trials.
• A maximal 10-km time trial was performed immediately post-intervention.
• Physiological measures (VO2, heart rate, blood lactate) and psychological measures (rated perceived exertion, Feeling Scale, attentional focus) were recorded.

Main Results:

• No significant differences were observed in 10-km time trial performance between VL and CL trials.
• VO2, heart rate, and blood lactate levels did not differ significantly between the two cycling conditions.
• Rated perceived exertion (RPE) and attentional focus were significantly higher during the VL trial compared to the CL trial.

Conclusions:

• CL and VL cycling elicit comparable physiological responses and do not differentially impact subsequent cycling performance.
• Despite similar objective outcomes, VL cycling may lead to a greater subjective experience of effort and altered mental focus during the exercise bout.