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Blood glucose responses of type-2 diabetics during and after exercise performed at intensities above and below anaerobic threshold

Keywords: Diabetes tipo 2 , Intensidade de exercício , Controle da glicemia. Type 2 Diabetes , Exercise intensity , Glycemic control.

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Abstract:

With the objective of analyzing the blood glucose responses during and after exercise performed at 90 and 110% of anaerobic threshold (AT), 10 type-2 diabetes patients (56.9±11.2years; 80.3±14.4kg) performed an incremental test (IT) on a cycle ergometer. After an initial IT to identify AT, the volunteers participated in three experimental sessions on three different days: 20 minutes’ of cycling at either 90 or 110% of AT, and a control session (CON). Blood glucose was measured at rest, and at the 10th and 20th minutes of exercise or control condition, as well as every 15 minutes during a 2-hour postexercise recovery period (Rec). One-way ANOVA did not detect signifi cant differences in blood glucose levels between the sessions at 90 and 110% of AT. Compared to CON, a signifi cant decrease was observed at the 20th minute of exercise, and at the 15th and 60th minutes of Rec from the 90% AT session. Signifi cant reductions were also observed at the 10th and 20th minutes of exercise and at the 15th, 30th, 45th, 60th and 90th minutes of Rec from the session at 110% AT. Exercise performed at the higher intensity (110% AT) resulted in a tendency of a more pronounced and prolonged hypoglycemic effect during and after exercise, and may be an alternative intensity for glycemic control in type 2 diabetics who do not have cardiovascular complications or other contraindications to exercising at intensities above the AT. Resumo Com o propósito de analisar a resposta da glicose sanguínea durante e após exercício a 90 e 110% do limiar anaeróbio (LA), 10 voluntários diabéticos tipo 2 (56,9 ± 11,2 anos; 80,3 ± 14,4 kg), realizaram um teste incremental (TI) em cicloerg metro. Após a realiza o do TI para identifi ca o do LA, os voluntários realizaram 3 sess es experimentais em dias distintos: 20 minutos em bicicleta ergométrica a 90 e 110% LA e uma sess o controle (CON). A glicemia foi mensurada no repouso, aos 10 e 20 min de exercício ou na situa o controle, bem como a cada 15 minutos durante 2 horas do período de recupera o pós-exercício (Rec) e CON. ANOVA n o identificou diferen as significantes nas concentra es de glicose sanguínea durante e após as sess es de 90 e 110% LA. Comparado ao controle, redu o signifi cativa da glicemia foi observada aos 20 min de exercício (-41 + 15 mg.dl-1), aos 15 min (-48 + 21 mg.dl-1) e 60 min da Rec pós sess o a 90% LA, sendo também observada diminui o signifi cativa da glicemia aos 10 e 20 min do exercício e aos 15, 30, 45, 60 e 90 min da Rec após sess o de 110% LA. O exercício de maior intensidade (110% LA) resultou em tendênci

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