Abstract
Arai T, Obuchi S, Shiba Y, Omuro K, Nakano C, Higashi T. The feasibility of measuring
joint angular velocity with a gyro-sensor.
Objectives
To determine the reliability of an assessment of joint angular velocity using a gyro-sensor
and to examine the relationship between ankle angular velocity and physical functions.
Design
Cross-sectional.
Setting
Kinesiology laboratory.
Participants
Twenty healthy young adults (mean age, 22.5y) and 113 community-dwelling older adults
(mean age, 75.1y).
Interventions
Not applicable.
Main Outcome Measures
Maximal ankle joint velocity was measured using a gyro-sensor during heel-rising and
jumping with knee extended. The intraclass correlation coefficient (ICC) was used
to determine the intertester and intratester reliability. The Pearson correlation
coefficient was used to examine the relationships between maximal ankle joint velocity
and isometric muscle strength and isokinetic muscle power in young adults and also
to examine the relationships between maximal ankle joint velocity and functional performance
measurements such as walking time in older adults.
Results
High reliability was found for intertester (ICC=.96) and intratester reliability (ICC=.96).
The data from the gyro-sensor highly correlated with muscle strength (r range, .62−.68; P<.01) and muscle power (r range, .45−.79; P range, .01−.05). In older subjects, mobility functions significantly correlated with
the angular velocity of ankle plantarflexion.
Conclusions
Measurement of ankle angular velocity using a gyro-sensor is both reliable and feasible,
with the results representing a significant correlation to muscle power and performance
measurements.
Key Words
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No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with which the author(s) is/are associated.
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© 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation. Published by Elsevier Inc. All rights reserved.
