Psoas major volume (left)
Bone and muscle healthSize measurement of the left psoas major muscle.
This core muscle's volume correlates with overall physical function and can serve as a biomarker for frailty or fitness.
Why this matters
The psoas is crucial for walking, posture, and core stability. Fat infiltration indicates muscle deterioration, causing deep groin or lower back pain, difficulty lifting legs (climbing stairs, getting in cars), and walking with shortened stride. Weak psoas affects posture, causing excessive back arch and protruding belly. Pain often radiates from lower back through groin to front of thigh.
Prolonged sitting worsens symptoms by keeping psoas shortened. This deep muscle weakness contributes to falls in older adults. This is a research-based wellness measurement.
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