Gradual versus continuous increase of load in ergometric tests: are the results comparable?

Area of Science:

• Sports Medicine
• Cardiorespiratory Physiology
• Exercise Science

Background:

• Standard exercise testing (ET) estimates exercise tolerance via workload.
• Cardiopulmonary exercise testing (CPX) provides precise cardiorespiratory fitness (CRF) quantification using ventilatory gas exchange.
• ET typically uses stepwise workload increases, while CPX employs a continuous ramp protocol.

Purpose of the Study:

• To compare the results of standard exercise testing (ET) and cardiopulmonary exercise testing (CPX).
• To evaluate the comparability of physical performance metrics between ramp (CPX) and stepwise (ET) protocols.

Main Methods:

• Thirty-two healthy volunteers performed bicycle ergometer tests.
• Participants underwent both ramp (CPX) and stepwise (ET) protocols to maximum exhaustion.
• Key metrics compared included maximal workload, exercise duration, and physical work capacity at specific heart rates (PWC150, PWC170).

Main Results:

• No statistically significant differences were observed in maximum heart rate or maximal workload between CPX and ET.
• Physical work capacity at 150 beats/min (PWC150) and normalized for body weight (PWC150/kg) were significantly higher with CPX.
• Exercise duration was comparable between the two testing methods.

Conclusions:

• Cardiopulmonary exercise testing (CPX) indicates higher overall physical performance compared to standard exercise testing (ET).
• Given the similar maximal results and higher capacity indicated by CPX, direct measurement of wattage and parameters is recommended.
• CPX is recommended for performance assessment, rendering interpolations obsolete.