Intensity- and Duration-Based Options to Regulate Endurance Training.

Area of Science:

• Exercise Physiology
• Sports Science
• Training Methodology

Background:

• Endurance training prescription traditionally focuses on intensity, neglecting individual exercise duration.
• Existing models like critical power lack comprehensive integration of intensity and duration for physiological responses.
• A need exists for a unified model to prescribe both intensity and duration for optimized training outcomes.

Purpose of the Study:

• To present a novel conceptual framework integrating exercise intensity and duration prescription for endurance training.
• To establish a model that accounts for individual physiological responses, fatigue, and adaptation.
• To optimize high-performance endurance exercise training through personalized prescription.

Main Methods:

• Combining the power/speed to distance/time relationship with individually determined lactate or gas exchange turn points.
• Differentiating exercise intensities into three zones based on physiological turn points.
• Deriving four fatigue domains from maximal duration data obtained via the power-duration curve.

Main Results:

• The model defines three distinct intensity zones with specific metabolic, hormonal, and cardio-respiratory responses.
• It establishes a maximal duration for any given power or velocity, crucial for training regulation.
• The framework allows for individual prescription of target intensities and durations within micro-cycles, managing fatigue and recovery.

Conclusions:

• This integrated model is the first to combine physiologically defined intensities with fatigue-related durations for training optimization.
• It provides a scientific basis for prescribing both exercise intensity and duration on an individual level.
• The framework offers a tool to enhance training effectiveness, recovery, and adaptation in endurance athletes.