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Exercise responses in patients with IDDM

A M Nugent1, I C Steele, F al-Modaris

  • 1Department of Medicine, Royal Victoria Hospital, Belfast, Northern Ireland, U.K.

Diabetes Care
|December 24, 1997
PubMed
Summary
This summary is machine-generated.

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This study found no exercise response impairment in long-standing diabetes patients, suggesting left ventricular ejection fraction changes are hemodynamic adaptations, not diabetic cardiomyopathy.

Area of Science:

  • Cardiology
  • Endocrinology
  • Exercise Physiology

Background:

  • Diabetic cardiomyopathy is a concern in individuals with diabetes mellitus.
  • Assessing exercise responses can reveal cardiac dysfunction.

Purpose of the Study:

  • To investigate hemodynamic, respiratory, and metabolic responses during exercise in patients with insulin-dependent diabetes mellitus (IDDM).
  • To detect potential diabetic cardiomyopathy by analyzing exercise parameters and cardiac function.

Main Methods:

  • Compared 8 IDDM patients (diabetes duration >10 years) with 8 control subjects.
  • Utilized progressive incremental and steady-state bicycle exercise tests.
  • Measured gas exchange, blood glucose, lactate, metabolites, catecholamines, cardiac output (CO2 rebreathing), and ejection fractions (radionuclide first-pass method).

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Main Results:

  • Similar peak oxygen consumption, heart rate, and double product between groups.
  • Diabetic subjects had higher glucose levels but comparable lactate, catecholamine, and fat metabolite levels.
  • Left ventricular ejection fraction showed a similar trend of decrease from rest to peak exercise in both diabetic and control groups, with no significant difference observed.

Conclusions:

  • No evidence of impaired exercise response in long-standing IDDM.
  • The observed decrease in left ventricular ejection fraction during peak exercise in diabetics may be a hemodynamic adaptation rather than a sign of diabetic cardiomyopathy.