Here - American Geriatrics Society
Here - American Geriatrics Society
Here - American Geriatrics Society
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P OSTER<br />
A BSTRACTS<br />
GDS and GDS apathy were negatively correlated to change in walking<br />
and walking endurance. The impact of depression and apathy on<br />
changes in walking endurance persisted even after controlling for<br />
change in inflammatory markers. Apathetic patients when compared<br />
to those without apathy had lower scores on verbal fluency (p=0.01-<br />
0.04), and increased intake (0.02).<br />
Conclusions: Depression and apathy scores but not neurocognitive<br />
scores were strong correlates of change in measures of physical<br />
function.<br />
B165<br />
Three, Five or Seven Days: How Much is Enough When Measuring<br />
Physical Activity with an ActiGraph Accelerometer in Older<br />
Adults?<br />
S. J. Francois, S. A. Studenski, J. S. Brach. University of Pittsburgh,<br />
Pittsburgh, PA.<br />
Supported By: Research/Grant Support: K23 AG026766, P30<br />
AG024827, T32 AG021885<br />
Background/Aims: Accelerometers provide valid and reliable<br />
measures of physical activity but have primarily been studied in<br />
healthy, young adults. Little is known about the reliability or wear<br />
time of accelerometers for measuring physical activity in older adults.<br />
Current protocols suggest 7 days to provide the best estimates of<br />
daily activity. Therefore, our goal is to assess the test-retest reliability<br />
of the ActiGraph accelerometer in community-dwelling older adults<br />
and determine if the number of days worn (3, 5, or 7) impact the testretest<br />
reliability of the measure.<br />
Methods: Participants included 32 community-dwelling older<br />
adults (mean age 78.0 ± 5.5 years) who ambulated independently<br />
(mean gait speed 0.96 ± 0.28 m/s). Physical activity was measured using<br />
an ActiGraph GT1M accelerometer (ActiGraph LLC, Pensacola, FL)<br />
worn on the waist during waking hours for 7 days. Subjects recorded<br />
wear times of the accelerometer in a daily journal. Subjects wore the<br />
accelerometers for another 7 days approximately 1 week later. Physical<br />
activity was summarized for each time period as the mean counts<br />
per minute per day (cpm) averaged over all 7 days, the first 5 days, and<br />
the first 3 days. Paired t-tests were used to compare physical activity<br />
measures from time 1 and time 2 and intraclass correlation coefficients<br />
(ICCs) were calculated to estimate the test-retest reliability.<br />
Results: The mean physical activity was similar for time 1 and<br />
time 2 for 7 days (135.4 and 135.3 cpm), 5 days (127.6 and 133.1 cpm)<br />
and 3 days (121.1 and 133.7 cpm); all p>0.15. The ICCs (95% CI) for<br />
7, 5, and 3 days of wear were 0.93 (0.86, 0.97), 0.92 (0.83, 0.96), and<br />
0.87 (0.73, 0.94), respectively.<br />
Conclusions: Compared to previous research in communitydwelling<br />
older adults (70+), the older adults in this sample demonstrated<br />
slightly lower levels of physical activity. Test-retest reliability<br />
for the ActiGraph accelerometer indicates moderate (3 days) to high<br />
(5 and 7 days) agreement in this older adult population. Taking into<br />
consideration accuracy of measurement and participant burden, our<br />
initial recommendation is at least 5 days of wear. The impact of weekend<br />
versus weekdays on physical activity measurement needs to be<br />
examined in future studies of older adults.<br />
B166<br />
How Do Falls, Fear and Cognition Influence the Association<br />
between Physical Performance and Self-Reported Function in Older<br />
Adults?<br />
V. A. Hornyak, 1 J. VanSwearingen, 1 D. Wert, 1 S. Studenski, 2 J. Brach. 1<br />
1. Physical Therapy, University of Pittsburgh, Pittsburgh, PA; 2.<br />
Geriatric Medicine, University of Pittsburgh, Pittsburgh, PA.<br />
Supported By: Support: Pittsburgh Older <strong>American</strong>’s Independence<br />
Center, 1 P30AG024827; Geriatric Academic Career Award<br />
K01HP20478; K23 AG026766.<br />
Background: Fall history, fear of falling (FOF) and cognitive<br />
function associate with reported physical functioning but how they<br />
influence the relation between physical performance and self-reported<br />
physical function is not known. We examined the relation of<br />
fall history, fear and cognition to reported physical functioning, controlling<br />
for performance in older adults.<br />
Methods: Older adults, independent in ambulation (n=70, mean<br />
age, 77± 5.3 years) completed physical performance and self-reported<br />
measures of function and cognition. The Late Life Function and Disability<br />
Instrument (LLFDI) overall functioning was used to determine<br />
physical function in daily life. Gait speed a performance measure<br />
of physical function was determined from self-paced walking over<br />
an instrumented walkway. Fall history and FOF were determined<br />
from the participant’s report. Cognitive function was determined<br />
using the Digit Symbol Substitution Test (DSST) and Trail-Making<br />
Test B (Trails B), measures of executive cognitive functioning. Pearson<br />
bivariate correlations were used to determine the relation between<br />
age, gait and cognitive functioning with physical functioning<br />
and define the related variables to include in the regression model. A<br />
linear regression model was used to determine the relative association<br />
of falls, fear and cognition to physical functioning, controlling for<br />
age, gender and gait speed.<br />
Results: Self-reported functioning (LLFDI) was related to gait<br />
speed (r=.56, p
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