Vol 3, No 2 (2002): Practical Diabetology
Other materials agreed with the Editors
Published online: 2002-05-13
Optimal exercise intensity for individuals with impaired glucose tolerance
Diabetologia Praktyczna 2002;3(2):103-108.
Abstract
Impaired glucose tolerance (IGT) is a transitory state
between normoglycemia and frank diabetes. One
in three individuals with IGT will develop type 2 diabetes
within 10 years if left untreated. A strong rationale
exists for the implementation of strategies
designed to reverse or stabilize the deterioration in
glucose homeostasis in individuals with IGT.
Recent physical activity guidelines from the Centers
for Disease Control and Prevention and the American
College of Sports Medicine have suggested that
intermittent moderate-intensity exercise is beneficial
and can improve the health status of these individuals.
Specifically, the guidelines recommend that
every American should accumulate 30 min of moderate-
intensity physical activity per day.
The current guidelines are based predominantly on
epidemiological data, and very little clinical evidence
exists that this level of physical activity can significantly
improve glycemic status. More intense exercise prescriptions
would appear to be needed to improve glucose
tolerance and insulin action. Although higher exercise
intensity is a key determinant for improvements
in glucose homeostasis, it may produce mechanical
and oxidative damage that can result in transitory impairments
in insulin action and glucose tolerance.
Therefore, the optimal exercise inten-sity for an individual
with IGT appears to lie between these two
extremes.
Keywords: physical activityimpaired glucose tolerancediabetes