(31-01-13) Resistance Versus Aerobic Exercise: Acute effects on glycemia in type 1 diabetes.

Yardley JE, Kenny GP, Perkins BA, Riddell MC, Balaa N, Malcolm J, Boulay P,
Khandwala F, Sigal RJ.
Source
Human and Environmental Physiology Research Unit, University of Ottawa,
Ottawa, Ontario, Canada.
Abstract
OBJECTIVEIn type 1 diabetes, small studies have found that resistance exercise
(weight lifting) reduces HbA(1c). In the current study, we examined the acute
impacts of resistance exercise on glycemia during exercise and in the
subsequent 24 h compared with aerobic exercise and no exercise.RESEARCH DESIGN
AND METHODSTwelve physically active individuals with type 1 diabetes (HbA(1c)
7.1 ? 1.0%) performed 45 min of resistance exercise (three sets of seven
exercises at eight repetitions maximum), 45 min of aerobic exercise (running at
60% of Vo(2max)), or no exercise on separate days. Plasma glucose was measured
during and for 60 min after exercise. Interstitial glucose was measured by
continuous glucose monitoring 24 h before, during, and 24 h after exercise.
RESULTSTreatment-by-time interactions (P < 0.001) were found for changes in
plasma glucose during and after exercise. Plasma glucose decreased from 8.4 ?
2.7 to 6.8 ? 2.3 mmol/L (P = 0.008) during resistance exercise and from 9.2 ?
3.4 to 5.8 ? 2.0 mmol/L (P = 0.001) during aerobic exercise. No significant
changes were seen during the no-exercise control session. During recovery,
glucose levels did not change significantly after resistance exercise but
increased by 2.2 ? 0.6 mmol/L (P = 0.023) after aerobic exercise. Mean
interstitial glucose from 4.5 to 6.0 h postexercise was significantly lower
after resistance exercise versus aerobic exercise.CONCLUSIONSResistance
exercise causes less initial decline in blood glucose during the activity but
is associated with more prolonged reductions in postexercise glycemia than
aerobic exercise. This might account for HbA(1c) reductions found in studies of
resistance exercise but not aerobic exercise in type 1 diabetes.


Source: Diabetes Care. 2012 Nov 19. [Epub ahead of print]

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