Muscle Quality and Subcutaneous Adipose Tissue in the Rectus Femoris and Rectus Abdominis Muscles: Ultrasound Evaluation and Functional Correlation in Older Adults

Inclusion Criteria: * Aged ≥ 65 years and living in the community. * Female sex. * Enrolled as a participant in PReGe program. Exclusion Criteria: * Recent surgery (\<6 months) involving the abdomen or lower extremities. * Presence of methal prostheses or implants in the thigh or abdoinal region. * Diagnosed neuromuscular disease (e.g., myopathies, advanced Parkinson's disease.) * Musculoskeletal disorders that impair basic mobility or prevent functional testing. * Acute illness or clinical decompensation at the time of assessment. * Unintentional weight loss \> 5 kg within the past month (suggestive of cachexia risk). * Presence of active abdominal hernias or severe diastasis recti.