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Diabetologia. 2008 Jul;51(7):1317-20. doi: 10.1007/s00125-008-1012-1. Epub 2008 Apr 30.

Impaired stroke volume and aerobic capacity in female adolescents with type 1 and type 2 diabetes mellitus.

Author information

1
Liggins Institute, University of Auckland, 2-6 Park Ave, Grafton, Private Bag 92019, Auckland, New Zealand. s.gusso@auckland.ac.nz

Abstract

AIM/HYPOTHESIS:

This study was designed to determine whether type 2 diabetic adolescents have reduced aerobic capacity and to investigate the role of cardiac output and arteriovenous oxygen difference (a-vO(2)) in their exercise response.

METHODS:

Female adolescents (age 12-18 years) with type 2 diabetes mellitus (n = 8) and type 1 diabetes mellitus (n = 12) and obese (n = 10) and non-obese (n = 10) non-diabetic controls were recruited for this study. Baseline data included maximal aerobic capacity (cycle ergometer) and body composition. Cardiac output and a-vO(2) were determined at rest and during submaximal exercise.

RESULTS:

Diabetic groups had lower aerobic capacity than non-diabetic groups (p < 0.05). Adolescents with type 2 diabetes had lower aerobic capacity than the type 1 diabetic group. Maximal heart rate was lower in the type 2 diabetic group (p < 0.05). Exercise stroke volume was 30-40% lower at 100 and 120 beats per min in the diabetic than in the non-diabetic groups (p < 0.05). The a-vO(2) value was not different in any condition.

CONCLUSIONS AND INTERPRETATION:

Type 2 diabetic adolescents have reduced aerobic capacity and reduced heart rate response to maximal exercise. Furthermore, type 2 and type 1 diabetic adolescent girls have a blunted exercise stroke volume response compared with non-diabetic controls. Central rather than peripheral mechanisms contribute to the reduced aerobic capacity in diabetic adolescents. Although of short duration, type 2 diabetes in adolescence is already affecting cardiovascular function in adolescents.

PMID:
18446317
DOI:
10.1007/s00125-008-1012-1
[Indexed for MEDLINE]

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