Development and impact of a physical exercise and nutritional guidance program during pregnancy and postpartum

INTERVENTION: Control group: they are received usual care from 20 gestational weeks until child birth Yoga Exercise intervention group: they perform yoga exercise 3 times a week at classes and their home Nutrition intervention group: they are individually instructed about their diet intakes during pregnancy Yoga Exercise and Nutrition intervention group: they receive both exercise and nutrition intervention CONDITION: Healthy pregnant women PRIMARY OUTCOME: Weight gain during pregnancy (baseline: 20 gestational weeks, endpoint 1: 28 gestational weeks, endpoint 2: 36 gestational weeks, endpoint 3: within 3 days after childbirth, endpoint 4: one month postpartum and endpoint 5: 18 months after child birth) SECONDARY OUTCOME: Comparison between baseline (20 gestational weeks) and endpoints (endpoint 1: 28 gestational weeks, endpoint 2: 36 gestational weeks);; 1. Salivary cortisol concentrations measured by using saliva collected 4 times a day for two days among yoga exercise group and control group; ; 2. Scores of psychological scales between control and nutrition group vs yoga group and yoga & nutrition group, additionally comparison between these four groups.; 1) Scores measured by Hospital anxiety and depression scale and Edinburgh Postnatal Depression Scale; 2) Fatigue scores measured by jikakusho shirabe; 3) Scores measured by pregnancy self‐evaluation questionnaire; 4) Self‐esteem scores ; 5) General Health Questionnaire; 6) Health related QOL(SF8); 7) Scores of minor disturbance symptoms ; 8)Birth satisfaction (within 3days after childbirth); 9) Cost‐effectiveness for maternal and family health from childbirth to 18 months after childbirth.; ; 3. Comparison nutrient outcomes between control and yoga group vs nutrition group and yoga & nutrition group, additionally comparison between these four groups; 1. Nutrient intakes; 2. Serum and plasma micro nutrients ; ; Comparison of salivary cortisol collected at 14:00 and 15:00; 1. Control group: collection at their home; 2. Yoga exercise group: collection before and after yoga class ; ; Comparisons of lower leg condition before and after exercise program participation among yoga and yoga & nutrition group;; 1. Circumference length of legs; 2. Blood flow and vessel diameter measured by ultrasonic echo; 3. Surface temperature measured by thermography; 4. Subjective symptoms INCLUSION CRITERIA: 1) Healthy pregnant women who are permitted to participate the study by their obstetricians 2) with singleton pregnancies