Effect of Progressive Muscle Relaxation and Diaphragmatic Breathing Techniques on Sleep Disturbances in Cancer Patients Undergoing Chemotherapy

Sleep disturbance is one of the most frequently reported symptoms among patients undergoing chemotherapy. Multiple factors contribute to impaired sleep in this population, including treatment-related side effects, psychological stress, fatigue, pain, and inflammatory responses associated with cancer and its treatment. Poor sleep quality may adversely affect treatment adherence, physical functioning, emotional health, and overall quality of life.

Non-pharmacological interventions have gained increasing attention as safe and cost-effective approaches for managing sleep disturbances in cancer patients. Progressive Muscle Relaxation is a technique that involves systematic contraction and relaxation of specific muscle groups to reduce physical tension and promote relaxation. Diaphragmatic Breathing focuses on slow, deep breathing using the diaphragm to enhance parasympathetic nervous system activity and reduce physiological arousal.

This study will employ a randomized controlled trial design. Eligible chemotherapy patients who meet the inclusion criteria will be randomly allocated to either an intervention group or a control group. Participants in the intervention group will receive a structured program consisting of Progressive Muscle Relaxation and Diaphragmatic Breathing exercises in addition to routine medical care. Participants in the control group will receive routine medical care only.

Sleep outcomes will be evaluated before and after the intervention period using the Pittsburgh Sleep Quality Index, sleep diary recordings, and wearable sleep monitoring devices. The findings of this study may provide evidence regarding the effectiveness of combined relaxation and breathing techniques as supportive interventions for improving sleep quality among patients undergoing chemotherapy.