Vitamin D and calcium levels are negatively affected during postpartum period, making postnatal woman more vulnerable to health issues and consequently lowering her quality of life. Twelve-weeks of Pilates training have improved serum 25-hydroxy vitamin D levels and changed anthropometry in inactive overweight women. It is well-known globally that aerobic exercise is low to moderate-intensity physical activity.

This study will be conducted to determine the difference between the effect of Pilates and aerobic exercises on serum levels of vitamin D, ionized calcium and osteocalcin in postnatal women. The practical aspect of the study will be conducted at the Out Patient Clinic of Al-Zahraa University Hospital, Al Azahar University, Cairo, Egypt. Sixty postnatal women will participate in this study. Their ages range will be from 18 to 40 and their BMI range will be from 25-35 kg/ m². All women will be postnatal period by 6-12 weeks, as well healthy primipara or multipara. The participants will be randomly assign into two equal groups by using a sealed envelope method; group A (Pilates exercises group) will include thirty postnatal women, whom will perform Pilates exercises for 12 weeks, and group (B), (Aerobic exercises group)will include thirty postnatal women, whom will perform aerobic exercises program for 12 weeks. Will assess vitamin D, Ionized calcium and osteocalcin for all participants at the start and after the treatment program, then will statistically analyze the data.

Inclusion Criteria:

1. Their ages were ranged from 18-40 years old.
2. Their body mass index (BMI) was ranged from 25-35 kg/ m².
3. They were postnatal period by 6-12 weeks.
4. They were primipara or multipara.
5. They were healthy postpartum women.

Exclusion Criteria:

1. High risk pregnant history.
2. Sever postpartum complications.
3. Cardiovascular diseases i.e., utilizing pace maker.
4. Skeletal deformity.
5. Participation at any other exercise training program during this study.
6. Malignant conditions.
7. History of acute infection
8. Neurological problem; epileptic fits…etc.
9. Mental problem to prevent evaluation and cooperation.
10. Renal, liver or endocrinal disorders.
11. Pulmonary disorders.

Postnatal women

Each participant will have one identification number that will be used to assign participants into two equal groups in number (n=30), sequentially numbered index cards will be secured in opaque envelopes. The researcher will open the sealed envelope, then will allocate the participants according to their groups.