Reliability of a high-intensity endurance cycling test

Area of Science:

• Sports Science
• Exercise Physiology
• Endurance Performance

Background:

• Assessing the reproducibility of high-intensity endurance cycling tests is crucial for evaluating interventions.
• Understanding metabolic responses during such tests aids in optimizing training and nutrition.

Purpose of the Study:

• To evaluate the test-retest reliability of performance and key metabolic variables during a novel variable high-intensity endurance cycling protocol.
• To determine the suitability of this protocol for assessing nutritional interventions in trained cyclists.

Main Methods:

• Eight trained male cyclists completed four identical high-intensity cycling tests over consecutive weeks.
• The protocol included progressive incremental exercise, repeated high-intensity intervals, and a final time to exhaustion phase.
• Performance (time to exhaustion, distance) and metabolic markers (plasma glucose, lactate) were measured, along with heart rate.

Main Results:

• No significant order effects were observed for time to exhaustion or total distance covered.
• High reliability was demonstrated for total time to exhaustion (CV 1.6%) and total distance (CV 2.2%).
• Plasma glucose and lactate concentrations exhibited minimal variability, indicating consistent metabolic responses.

Conclusions:

• The variable high-intensity endurance cycling test demonstrates excellent reliability for performance outcomes.
• The protocol's reproducibility in metabolic responses supports its use in evaluating nutritional strategies.
• This validated test protocol can be effectively employed in endurance cycling research and practice.