Using ramp-incremental V̇O₂ responses for constant-intensity exercise selection

Area of Science:

• Exercise Physiology
• Sports Science
• Cardiorespiratory Fitness

Background:

• A persistent view in exercise physiology is that oxygen uptake (V̇O2) increases linearly with exercise intensity.
• This implies V̇O2 responses from ramp-incremental tests can predict those during constant-intensity exercise.

Purpose of the Study:

• To review factors causing dissociation in V̇O2-intensity relationships between ramp and constant exercise paradigms.
• To identify appropriate use of ramp V̇O2 data for assigning constant-intensity exercise.
• To illustrate challenges in prescribing exercise solely from ramp-incremental tests.

Main Methods:

• Review of exercise physiology literature.
• Analysis of V̇O2 versus exercise intensity relationships.
• Presentation of cycling V̇O2 data and kinetics modeling.

Main Results:

• The V̇O2-intensity relationship differs between ramp-incremental and constant-intensity exercise.
• Direct translation of V̇O2 responses from ramp to constant exercise is often inappropriate.
• Challenges exist in using ramp data for precise constant-intensity exercise prescription.

Conclusions:

• The linear framework for aerobic exercise prescription based on ramp tests is flawed.
• Understanding the dissociation between exercise paradigms is crucial for accurate intensity assignment.
• Solutions are proposed for improved individual-specific aerobic exercise prescription.