This study will be conducted to investigate any significant effect of pneumatic compression on diaphragmatic excursion in patients with low back dysfunction .
Patients have been on regular hemodialysis (three sessions a week) at least 6 months before the start of the study
Patients 'Age between 40 and 60 years old
Patients have not participated in any physical activity program at least 6 months before the start of the study
Patients have chronic back pain > 3months
Instability of patient's medical condition
Patients with chest infection
Inability to comprehend and follow instructions as in dementia or speech problems such as dysphasia,
uncontrolled diabetes mellitus,