Comparison of maximal oxygen consumption between black and white prepubertal and pubertal children

Area of Science:

• Pediatric Exercise Physiology
• Sports Medicine
• Human Physiology

Background:

• Maximal oxygen consumption (VO2max) is a key indicator of cardiorespiratory fitness.
• Understanding factors influencing VO2max differences across racial groups in children is crucial for targeted health interventions.
• Previous research has not fully elucidated the interplay of hematologic profiles, body composition, and physical activity in racial disparities of VO2max.

Purpose of the Study:

• To investigate differences in VO2max between black and white children.
• To examine the relationship between VO2max disparities and hematologic profiles, body composition, and physical activity levels.
• To identify potential contributing factors to observed differences in cardiorespiratory fitness.

Main Methods:

• Participant recruitment included prepubertal and pubertal black and white children.
• Body composition was assessed using dual-energy x-ray absorptiometry.
• Visceral and subcutaneous adipose tissue were quantified via computed tomography scans.
• Daily physical activity/inactivity was evaluated using questionnaires.

Main Results:

• Black prepubertal and pubertal children demonstrated significantly lower VO2max values compared to their white counterparts.
• Black children exhibited lower hemoglobin concentrations and hematocrit levels than white children across both age groups.
• While body composition was assessed, the primary findings linked lower VO2max to reduced hemoglobin and higher inactivity in black children.

Conclusions:

• Black prepubertal and pubertal children have lower VO2max than age, pubertal stage, and BMI-matched white peers.
• Lower hemoglobin concentrations and a more sedentary lifestyle appear to contribute to the observed VO2max differences.
• Future research should explore hemoglobin flow rate in relation to VO2max in diverse pediatric populations.