In this group (the first study group) fifteen breast cancer patients after receiving chemotherapy within 3-6 months and complaining from osteoporosis were received the whole body vibration, 20 minutes 3 times per week for 2 months and drug therapy (vitamin D supplements and calcium).

In this group (the second study group) fifteen breast cancer patients after receiving chemotherapy within 3-6 months and complaining from osteoporosis were received aerobic exercise on treadmill as form of weight bearing exercise 20 minutes 3 times per week for 2 months and drug therapy (vitamin D supplements and calcium).

In this group (control group) fifteen breast cancer patients after receiving chemotherapy within 3-6 months and complaining from osteoporosis were received only drug therapy (vitamin D supplements and calcium. Measurements were conducted before starting the treatment as a first record, at end of the second month of treatment as second record and make follow up after 3 months as final record.

Whole body vibration apparatus (model Power plate -my5tm, made in United States) with frequency 30 - 40 Hz was used for the whole body vibration program by reciprocating vertical displacements on the left and right side of a fulcrum.

By using DEXA (dual-energy X-ray absorptiometry): Dual-energy X-ray absorptiometry (DEXA) is a clinically proven method of measuring bone mineral density (BMD) in the lumbar spine, proximal femur, forearm, and whole body. It is used primarily in the diagnosis and management of osteoporosis and other disease states characterized by abnormal BMD, as well as to monitor response to therapy for these conditions .