Effect of differences in post-exercise lactate accumulation in athletes' haemodynamics

Area of Science:

• Exercise Physiology
• Cardiovascular Dynamics
• Sports Science

Background:

• Understanding the relationship between exercise intensity and post-exercise physiological responses is crucial for optimizing training and recovery.
• Previous research indicates varying haemodynamic and metabolic effects based on exercise protocols.

Purpose of the Study:

• To investigate the association between exercise intensity, resulting blood lactate levels, and post-exercise haemodynamic adjustments.
• To determine how different exercise intensities impact cardiac preload, systemic vascular resistance, and mean blood pressure during recovery.

Main Methods:

• Three bicycle exercise tests were conducted: 70% and 130% of anaerobic threshold workload (W(at)) for 3 minutes each, and 150% of maximum workload (W(max)) to exhaustion.
• Haemodynamic parameters and blood lactate concentrations were measured during a 10-minute recovery period following each test.

Main Results:

• The 150% W(max) test induced the highest increase in blood lactate concentration (+9.3 mmol x L(-1)) compared to 130% W(at) (+6.4 mmol x L(-1)) and 70% W(at) (+1.1 mmol x L(-1)).
• Greater reductions in cardiac preload and systemic vascular resistance were observed after the 150% W(max) test.
• Despite increased vasodilation during 150% W(max) recovery, cardiac output compensated, maintaining similar mean blood pressure across all test conditions.

Conclusions:

• Exercise protocols eliciting higher lactate concentrations are associated with greater post-exercise vasodilation.
• The cardiovascular system demonstrates robust regulatory mechanisms to prevent blood pressure drops during recovery from significant exercise-induced stress.
• These findings highlight the body's adaptive capacity to manage haemodynamic challenges following intense physical exertion.