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Clinical Investigations: CARDIOLOGY |

Influence of Cardiac Functional Capacity on Gender Differences in Maximal Oxygen Uptake in Children*

Thomas Rowland, MD; Donna Goff, MS; Leslie Martel, MEd; Lisa Ferrone, MS
Author and Funding Information

*From the Department of Pediatrics (Dr. Rowland, and Mss. Martel and Ferrone), Baystate Medical Center, Springfield, MA; and the Department of Exercise Science (Ms. Goff), University of Massachusetts, Amherst, MA.

Correspondence to: Thomas Rowland, MD, Department of Pediatrics, Baystate Medical Center, Springfield, MA 01199



Chest. 2000;117(3):629-635. doi:10.1378/chest.117.3.629
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Objective: To examine the role of gender differences in cardiac functional capacity in explaining higher mean values for maximal oxygen uptake (V̇o2max) in boys than in girls.

Design: Comparative group exercise testing.

Setting: Pediatric exercise testing laboratory.

Subjects: Twenty-five prepubertal boys (mean [± SD] age, 12 ± 0.4 years) and 24 premenarcheal girls (mean age, 11.7 ± 0.5 years).

Interventions: Maximal incremental upright cycle exercise.

Measurements and results: Mean values for V̇o2max were the following: boys, 47.2 ± 6.1 mL/kg/min; and girls, 40.4 ± 5.8 mL/kg/min (16.8% difference; p < 0.05). The average maximal stroke index with Doppler echocardiography was 62 ± 9 mL/m2 for boys and 55 ± 9 mL/m2 for girls (12.7% difference; p < 0.05). No significant gender differences were seen in maximal heart rate or arterial venous oxygen difference. When V̇o2max and maximal stroke volume (SV) were expressed relative to lean body mass, gender differences declined but persisted, falling to 6.2% and 5.2%, respectively.

Conclusions: These findings indicate that differences in SV as well as in body composition contribute to gender-related variations in V̇o2max during childhood. Whether this reflects small gender differences in relative heart size or dynamic factors influencing ventricular preload and contractility during exercise is unknown.

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