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Quantification of everyday motor function in a geriatric population.

Eling D de Bruin¹, Bijan Najafi, Kurt Murer

¹Institute of Human Movement Sciences and Sport, ETH Zürich, Zürich, Switzerland. debruin@move.biol.ethz.ch

Journal of Rehabilitation Research and Development

|February 6, 2008

Summary

This study found that sit-to-stand transition duration was reliably measured after one day using an activity monitor in older adults. However, daily physical activity levels showed high variability, suggesting longer monitoring periods are needed.

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Area of Science:

Gerontology and Rehabilitation Engineering
Biomedical Signal Processing

Background:

Assessing physical activity in the elderly is crucial for maintaining independence and preventing falls.
Traditional methods may not accurately capture the variability of daily movements.
Ambulatory activity monitors offer a promising solution for objective measurement.

Purpose of the Study:

To evaluate the reliability of an ambulatory activity monitor in measuring physical activities in older adults.
To explore correlations between walking, postural transitions (sit-to-stand and stand-to-sit), and falls efficacy.
To determine the minimum monitoring duration for reliable assessment of physical activity in this population.

Main Methods:

A pilot study involving 11 older adults (mean age 87.8 years) wearing an ambulatory activity monitor for 2 consecutive days.
Seven participants wore the monitor for an additional day in the following week.
Analysis included sit-to-stand (SiSt) and stand-to-sit transition durations, walking, and static postures (sitting, standing, lying).

Main Results:

Sit-to-stand transition duration showed high reliability between measurement days (ICC = 0.78).
No significant differences were found in the durations of sitting, lying, standing, or walking between days.
A significant positive correlation was observed between falls efficacy and sit-to-stand measures (r = 0.84, p < 0.01).

Conclusions:

One day of monitoring is sufficient to reliably determine sit-to-stand transition duration in a home environment.
High variability in daily dynamic and static activities necessitates longer monitoring periods for accurate assessment in the geriatric population.
Activity monitors can reliably measure specific movements and correlate with functional measures like falls efficacy.