Reliability and Validity of Isometric Back Extensor Strength Measurements Using Hand-Held and Isokinetic Dynamometry in Sitting and Semi-Standing Positions

Key Points

• The study aims to assess the reliability and validity of isometric back extensor strength measurements in sitting and semi-standing positions compared to the standard prone position.
• Used hand-held dynamometry in sitting position and Biodex system in semi-standing position.
• Compared measurements with isometric strength obtained in the prone position.
• Included older adults with difficulties assuming the prone position.
• Measurements in sitting and semi-standing positions show comparable reliability to the prone position.
• Validity of strength measurements in alternative positions is established.
• Sitting and semi-standing options may provide clinically feasible alternatives for older adults.

Abstract