Participants will receive a 6-week intervention consisting of structured upper extremity exercise combined with pneumatic compression therapy. Outcomes will be measured at baseline, post-treatment, and one-week follow-up.

Warm-up (5 min): shoulder flexion, abduction, circular motion Active and resistance training (20 min): using elastic bands or 0.5 kg weights： Seated rowing/Chest press/Lat pulldown/Single-arm row/Biceps curl/Triceps extension Two sets of 10 repetitions (or up to 3 sets depending on tolerance) Stretching (5 min): overhead stretch, lateral flexion, biceps/triceps stretch

Upper Limb Circumference Measurement

Upper limb circumference was measured using a non-elastic standard measuring tape at predefined anatomical landmarks to assess limb swelling.

Measurement Sites:

Elbow joint

5 cm, 10 cm, and 15 cm proximal to the elbow

5 cm, 10 cm, and 15 cm distal to the elbow

Wrist joint

Circumference was recorded in centimeters (cm) at each site. Greater circumference values indicate greater limb swelling, while lower values indicate reduction of lymphedema.

Standardization Procedures:

All measurements were performed by the same trained assessor.

Measurements were conducted within the same time window (e.g., 9:00 AM-12:00 PM).

Participants rested for 10 minutes prior to measurement.

Measurements were obtained with the participant in the same standardized posture at each assessment time point.

Shoulder Range of Motion (ROM) is measured using a standard goniometer to assess active shoulder movements, including flexion, extension, abduction, adduction, internal rotation, and external rotation.

ROM is measured in degrees (°). Higher values indicate greater joint mobility and better functional movement.

There is no fixed minimum or maximum score, as normal values vary by movement; however, greater degrees reflect better shoulder function.

The Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire is a self-reported measure of upper extremity function and symptoms.

The DASH score ranges from 0 to 100.

0 indicates no disability (best function).

100 indicates most severe disability (worst function).

Higher scores represent worse upper extremity function and greater disability.

The Functional Assessment of Cancer Therapy - Breast (FACT-B) is a validated self-reported questionnaire assessing quality of life in patients with breast cancer. It includes physical, social/family, emotional, functional well-being, and breast cancer-specific concerns.

The total FACT-B score ranges from 0 to 148.

Higher scores indicate better quality of life.

Lower scores indicate poorer quality of life.