The reliability and validity of a designed setup for the assessment of static back extensor force and endurance in older women with and without hyperkyphosis.

Objective: The purpose of this study was to investigate the intra-rater reliability and validity of a designed load cell setup for the measurement of back extensor muscle force and endurance.

Participants: The study sample included 19 older women with hyperkyphosis, mean age 67.0 ± 5.