Lateral mobility is integral to many activities of daily living involving transfer from one position to another. The objective of this study was to develop and evaluate the validity and test–retest reliability of a lateral-mobility (LATMOB) task for older adults. Measurements of lateral mobility, balance, and strength and self-reported and performance-based physical functioning were obtained in 63 women and 77 men ≥50 years of age. The LATMOB task was significantly correlated with age, knee-extensor strength, grip strength, functional reach, and one-leg-stance time. Test–retest reliability of the task was excellent. The LATMOB task was highly correlated with the car task. Balance was significantly correlated with time to get into and out of a car and performance on the LATMOB task. The LATMOB task was significantly correlated with the Short Physical Performance Battery score. The LATMOB task is valid and reliable, but additional work is needed to assess its sensitivity to change and predictive validity.
Marsh, Rejeski, Hutton, and Brown are with the Dept. of Health and Exercise Science, Wake Forest University, Winston-Salem, NC 27109-7868. Ip is with the Section on Biostatistics, Dept. of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, NC 27157-1063. Guralnik is with the Laboratory of Epidemiology, Demography and Biometry, National Institute on Aging, Bethesda, MD 20892-9205.