Blood lactate concentrations during incremental exercise in subjects with sickle cell trait

Area of Science:

• Exercise Physiology
• Hematology
• Sports Medicine

Background:

• Sickle cell trait (SCT) is a genetic condition affecting red blood cells.
• Understanding the physiological responses to exercise in SCT is crucial for athletes and clinicians.
• Previous research has not fully elucidated exercise metabolism in SCT individuals without anemia or alpha-thalassemia.

Purpose of the Study:

• To compare blood lactate concentrations and oxygen uptake during incremental exercise in individuals with SCT versus healthy controls.
• To investigate potential differences in exercise capacity and metabolic responses.
• To determine if SCT impacts lactate accumulation independent of anemia or alpha-thalassemia.

Main Methods:

• Incremental exercise testing on an electromagnetic cycle ergometer was performed.
• Cardiopulmonary exercise testing (CPET) measured oxygen uptake (VO2) and ventilatory parameters.
• Blood lactate ([LA]) levels were measured serially during exercise and recovery.

Main Results:

• No significant differences were observed in cardioventilatory variables between SCT and control groups.
• Blood lactate ([LA]) concentrations were significantly lower in the SCT group during incremental exercise and recovery.
• Oxygen uptake (VO2) time courses were similar between the SCT and control groups.

Conclusions:

• Individuals with sickle cell trait exhibit reduced blood lactate accumulation during and after incremental exercise.
• This blunted lactate response in SCT is not linked to impaired oxygen uptake (VO2).
• SCT may influence substrate utilization or lactate kinetics during exercise without compromising aerobic capacity.