Zone of Apposition (ZOA) Assessment
Setup
Client supine, hook-lying. Shirt lifted to expose lower ribcage and abdomen. This test is linked to the Infrasternal Angle assessment.
Cueing
Step 1: Observe the infrasternal angle (narrow <85 or wide >95). Step 2: 'Exhale fully and hold.' Observe: does the lower ribcage compress and move inward (good ZOA)? Or do the ribs stay flared/extended (lost ZOA)? Step 3: 'Now inhale gently.' Observe: can the client expand the ribcage laterally and posteriorly (good 360 expansion) or does the chest just lift (lost ZOA, compensatory apical pattern). Pressure: 0/10 (observation).
Measurement
Pattern: optimal-zoa / narrow-zoa (over-compressed) / lost-zoa-bilateral (extended, ribs flared) / lost-zoa-left / lost-zoa-right.
Modality
FAQ
What muscles does Zone of Apposition (ZOA) Assessment work?
Zone of Apposition (ZOA) Assessment primarily targets the T Spine. It is classified as a professional-level assessment test.
How do you perform Zone of Apposition (ZOA) Assessment correctly?
Client supine, hook-lying. Shirt lifted to expose lower ribcage and abdomen. This test is linked to the Infrasternal Angle assessment. Step 1: Observe the infrasternal angle (narrow <85 or wide >95). Step 2: 'Exhale fully and hold.' Observe: does the lower ribcage compress and move inward (good ZOA)? Or do the ribs stay flared/extended (lost ZOA)? Step 3: 'Now inhale gently.' Observe: can the client expand the ribcage laterally and posteriorly (good 360 expansion) or does the chest just lift (lost ZOA, compensatory apical pattern). Pressure: 0/10 (observation).
What equipment is needed for Zone of Apposition (ZOA) Assessment?
Zone of Apposition (ZOA) Assessment requires Assessment Kit. It is categorized as a Pattern Analysis assessment test.
Related Exercises
Anterior Rib Angle (ARA) Assessment
Apical Rib Angle
Infrasternal Angle (ISA)
Lower Chest Expansion
Rib Cage Expansion Asymmetry (Breathing Under Load)
Sidelying Rib Cage Expansion Assessment
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