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Research Reports |
MB King, MD, is a geriatrician in the Hartford Hospital Geriatric Program, Hartford, Conn, and Assistant Professor of Medicine, University of Connecticut School of Medicine, Farmington, Conn.
JO Judge, MD, is Vice President of Medical Services, Masonicare, Wallingford, Conn, and Associate Professor of Medicine, University of Connecticut Health Center, Farmington, Conn
R Whipple, PT, is Assistant Professor of Neurology, University of Connecticut Health Center
L Wolfson, MD, is Chairman and Professor, Department of Neurology, University of Connecticut Health Center and Hartford Hospital
Mark Thomas, MD, Odin Kuiper, MD, Asif Ali, MD, Doug Mangan, and Mawuena Quist assisted with the physical performance testing
Address all correspondence to Dr King at Hartford Hospital Geriatric Program, Burlingame Bldg, 2nd Floor, 400 Washington St, Hartford, CT 06106 (USA) (mking{at}nso.uchc.edu)
Background and Purpose. The reliability and responsiveness of 2 physical performance measures were assessed in this nonrandomized, controlled pilot exercise intervention. Subjects. Forty-five older individuals with mobility impairment (mean age=77.9 years, SD=5.9, range=70–92) were sequentially assigned to participate in an exercise program (intervention group) or to a control group. Methods. The intervention group performed exercise 3 times a week for 12 weeks that targeted muscle force, endurance, balance, and flexibility. Outcome measures were the 8-item Physical Performance Test (PPT-8) and the 6-minute walk test. Test-retest reliability and responsiveness indexes were determined for both tests; interrater reliability was measured for the PPT-8. Results. The intraclass correlation coefficient for interrater reliability for the PPT-8 was .96. Intraclass correlation coefficients for test-retest reliability were .88 for the PPT-8 and .93 for the 6-minute walk test. The intervention group improved 2.4 points and the control group improved 0.7 point on the PPT-8, as compared with baseline measurements. There was no change in 6-minute walk test distance in the intervention group when compared with the control group. The responsiveness index was .8 for the PPT-8 and .6 for the 6-minute walk test. Conclusion and Discussion. Measurements for both the PPT-8 and the 6-minute walk test appeared to be highly reliable. The PPT-8 was more responsive than the 6-minute walk test to change in performance expected with this functional training intervention.
Key Words: Older people • Physical performance • Reliability • Responsiveness
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