Non-invasive haemodynamic assessments using Innocor during standard graded exercise tests

Area of Science:

• Cardiovascular Physiology
• Exercise Physiology
• Sports Science

Background:

• Cardiac output (Q) and stroke volume (V(S)) are key indicators of cardiovascular performance.
• Accurate measurement of Q and V(S) is crucial for performance diagnostics.
• The feasibility of using Innocor for Q and V(S) measurements during graded exercise tests (GXTs) was previously undetermined.

Purpose of the Study:

• To determine if Innocor can accurately measure cardiac output (Q) and stroke volume (V(S)) during standard graded exercise tests (GXTs).
• To assess if standard GXT stage durations are sufficient for reliable Q and V(S) measurements.
• To evaluate the stability of Q and V(S) within GXT stages.

Main Methods:

• 16 male cyclists performed three GXTs.
• Cardiac output (Q) and stroke volume (V(S)) were measured using Innocor at 46 and 103 seconds into 2-minute GXT stages.
• Measurements were taken at 69%, 77%, and 85% of peak power output.

Main Results:

• Innocor rebreathing measurements were easily integrated into GXT protocols.
• Cardiac output (Q) and stroke volume (V(S)) remained stable between early and late time points within each GXT stage.
• No significant changes in Q or V(S) were observed across different submaximal power outputs.

Conclusions:

• Innocor is a potentially valuable tool for assessing cardiac output (Q) and stroke volume (V(S)) during GXTs.
• Cardiovascular adaptations in Q and V(S) occur rapidly enough for measurements within 1-2 minute GXT stages.
• This method supports enhanced performance diagnostics in athletes.