Reliability and Validity of the Sit-to-Stand as a Muscular Power Measure in Older Adults

in Journal of Aging and Physical Activity
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The study aims were to analyze the reliability and validity of the GymAware linear position transducer’s velocity and power measures during the sit-to-stand, compared with the Dartfish 2D videography analysis, and to assess the relationship of age and handgrip strength with velocity and power in 48 older men and women (77.6 ± 11.1 years). The results showed excellent agreement between GymAware- and Dartfish-derived sit-to-stand velocity (intraclass correlation coefficient2-1 = .94 and power intraclass correlation coefficient2-1 = .98) measures. A moderate and negative relationship was found between age and velocity (r = −.62; p < .001) and age and power (r = −.63; p < .001). A moderate and positive relationship was found between handgrip strength and velocity (r = .43; p = .002) and handgrip strength and power (r = .54; p < .001). The results show the GymAware velocity and power measures during the sit-to-stand in older adults to be reliable and valid.

The authors are with Kinesiology Research Laboratory, Department of Kinesiology, California State University, East Bay, Hayward, CA.

Sherwood (jennifer.sherwood@csueastbay.edu) is corresponding author.
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