The aim of the present study is verify glycated hemoglobin (HbA1c) and HOMA behavior in pregnant women with gestational diabetes or chronic hypertension after an aerobic training in cycle-ergometer. The sample is composed by 64 pregnant and sedentary women, 20 weeks' pregnant.

Two experimental groups (gestational diabetes and chronic hypertension, n = 16 each) will perform a low-intensity aerobic training in cycle-ergometer, three times/week, for 45 minutes each session. Two control groups (gestational diabetes and chronic hypertension, n = 16 each) will perform an unique session/week of relaxation and stretching.

Outcomes: first ventilatory threshold, HbA1c,HOMA, type of delivery, weight and height of the newborn.

The statistical analysis will consist of:

• descriptive statistic;
• Levene's test
• Shapiro Wilk's normality test
• Parametric or non-parametric test
• a=0.05
• SPSS 17.0

Inclusion Criteria:

• age > 20 years;
• gestational age between 20 and 27 weeks (date of the last period and confirmed by ultrasound);
• Only one foetus in the womb;
• Without orthopedic limitations;
• Non-smoker;
• Medical clearance for exercise

Exclusion Criteria:

• Pre-eclampsia;
• fetal malformations;
• Intrauterine fetal death