Cardio-pulmonary responses to incremental eccentric and concentric cycling tests to task failure

Area of Science:

• Exercise Physiology
• Sports Science
• Biomechanics

Background:

• Concentric (CON) and eccentric (ECC) muscle actions differ in force production and metabolic demands.
• Understanding cardio-pulmonary responses during incremental ECC exercise is crucial for optimizing training.

Purpose of the Study:

• To compare cardio-pulmonary responses between incremental CON and ECC cycling tests.
• To identify factors influencing maximal ECC cycling capacity.

Main Methods:

• Eleven participants (9 men, 2 women) completed separate incremental CON and ECC cycling tests to task failure.
• Cardio-pulmonary variables (gas exchange, HR, power output) were continuously monitored.
• Maximal voluntary quadriceps contractions (MVC) and jump performances were assessed.

Main Results:

• Peak power output was 53% higher in ECC (449 W) vs. CON (294 W) (P<0.001).
• Peak oxygen consumption was 43% lower in ECC (30.6 ml·kg⁻¹·min⁻¹) vs. CON (43.9 ml·kg⁻¹·min⁻¹) (P<0.001).
• ECC peak power correlated with CON peak power (r=0.84), peak oxygen consumption (r=0.54), and MVC (r=0.53).

Conclusions:

• Maximal heart rate was similar between ECC and CON tests.
• ECC cycling capacity can be predicted from CON peak power output.
• Incremental ECC testing may be valuable for programming training in healthy, accustomed individuals.