Volume 44 Number 1 2007
Pages 33 — 42
Abstract - Chair rise strategies in older adults with functional limitations
Donna Moxley Scarborough, MS, PT;1-2* Chris A. McGibbon, PhD;1-3 David E. Krebs, DPT, PhD1-2
1Department of Orthopedics, Biomotion Laboratory, Massachusetts General Hospital (MGH), Boston, MA; 2MGH Institute of Health Professions, Boston, MA; 3Institute of Biomedical Engineering, University of New Brunswick,
Fredericton, NB, Canada
Abstract — Studies investigating chair rise (CR) strategies in older adults, including the identification of CR strategies in the clinical setting, are limited. We identified biomechanical differences between CR strategies performed by older adults. The "healthy" momentum transfer (MT), the exaggerated trunk flexion (ETF), and the dominant vertical rise (DVR) CR strategies were observed in 29 women and 17 men (64-88 yr) with functional limitations. The DVR strategy required the greatest knee torque (mean = 12.76 moment-% body weight). Maximum knee torque occurred significantly earlier for the ETF strategy (mean = 47% CR time). Lift-off time was earliest for the ETF strategy (mean = 32% CR time). Peak trunk flexion was the primary distinguishing biomechanical measure for classifying CR strategy. This finding may offer clinicians an easy method of identifying CR strategies during evaluation. Because of DVR and ETF movement timing and torque demands, we conclude that MT is the safest and most preferable CR strategy.
Key words: chair rise, dominant vertical rise, exaggerated trunk flexion, functional limitations, momentum transfer, movement strategy, older adults, peak trunk flexion, rehabilitation, sit-to-stand.