Comparison of Relationship between Accelerometer Outputs and Energy Expenditures in People with and without Down syndrome during Walking Activity Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5712mc01p

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  • In recent years
  • In recent years, there has been an increased interest in accurately measuring physical activity levels with accelerometers. Two distinct approaches have been used to estimate physical activity levels with accelerometers are vertical axis activity counts and vector magnitude (VM). Although previous studies evaluated these two distinct approaches for individuals without disabilities, employing VM may have a greater advantages for people with Down syndrome (DS) because of their unique movement pattern of increase movements along the mediolateral axis during walking. The purpose of this study was to identify which approaches, to physical activity monitoring, can better predict physical activity levels for people with and without DS while walking. A total of 37 participants completed the testing protocol, 18 participants with DS (age 19 – 64 years; 32.56 14.16) and 19 participants without DS (nDS; age 19 – 64 years; 31.61 12.90). All participants took part in one session of data collection involving walking at different speeds. Participants wore a GT3X+ triaxial accelerometer on their right hips to measure activity counts, a Oxycon Mobile System on the front of their body to measure energy expenditure, and a heart rate monitor to measure approximate relative intensity during testing protocols. All participants were asked to walk at three different speeds for six minutes at each speed of self-selected speed, slow speed (2 mph), and fast speed (4 mph) in a figure “8” shape with a five minute break between each trial. During the slow and fast speed trials, a trained pacer along with a calibrated wheel and speedometer walked in front of all participants to ensure maintenance of speed. The results showed the correlation between energy expenditure and accelerometer outputs, both vertical axis activity counts and VM for individuals without DS are 0.75 at a group levels using linear mixed effect models. And the correlation coefficient between energy expenditure and vertical axis activity counts and VM for people with DS are 0.53 and 0.64, respectively. There werer no significant difference between the correlations for the without DS group and a correlation approaching significance for the DS grou when comparing the correlation with energy expenditure between vertical axis activity counts and VM. Significant differences were found between groups when comparing correlation coefficients with energy expenditure and vertical axis activity counts using z – test (z = 1.99, p-value = 0.046). No significant difference was found between groups when comparing correlation coefficient between energy expenditure and VM (z = 1.06, p-value = 0.29). For people without DS, this study supported that using either approach yielded similar results. This result was surprising given the unique characteristics of people with DS. Additional studies are needed to continue to determine the accuracy of the accelerometer in measuring physical activity levels for people with DS accounting for their unique characteristic.
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  • description.provenance : Approved for entry into archive by Steven Van Tuyl(steve.vantuyl@oregonstate.edu) on 2017-07-05T18:17:05Z (GMT) No. of bitstreams: 2 license_rdf: 1536 bytes, checksum: df76b173e7954a20718100d078b240a8 (MD5) LeungChunW2017.pdf: 3146775 bytes, checksum: 7e6970f2badc4977f1f436d0192702d9 (MD5)
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