ERIC Number: EJ1081408
Record Type: Journal
Publication Date: 2015
Abstractor: As Provided
Ankle Accelerometry for Assessing Physical Activity among Adolescent Girls: Threshold Determination, Validity, Reliability, and Feasibility
Hager, Erin R.; Treuth, Margarita S.; Gormely, Candice; Epps, LaShawna; Snitker, Soren; Black, Maureen M.
Research Quarterly for Exercise and Sport, v86 n4 p397-405 2015
Purpose: Ankle accelerometry allows for 24-hr data collection and improves data volume/integrity versus hip accelerometry. Using Actical ankle accelerometry, the purpose of this study was to (a) develop sensitive/specific thresholds, (b) examine validity/reliability, (c) compare new thresholds with those of the manufacturer, and (d) examine feasibility in a community sample (low-income, urban adolescent girls). Method: Two studies were conducted with 6th- through 7th-grade girls (aged 10-14 years old): First was a "laboratory study" (n = 24), in which 2 Actical accelerometers were placed on the ankle and worn while measuring energy expenditure (Cosmed K4b2, metabolic equivalents [METs]) during 10 prescribed activities. Analyses included device equivalence reliability (intraclass correlation coefficient [ICC], activity counts of 2 Acticals), criterion-related validity (correlation, activity counts and METs), and calculations of sensitivity, specificity, kappa, and receiver-operating characteristic curves for thresholds. The second was a "free-living study" (n = 459), in which an Actical was worn for more than 7 days on the ankle (full 24-hr days retained). Analyses included feasibility (frequencies, missing data) and paired t tests (new thresholds vs. those of the manufacturer). Results: In the "laboratory study," the Actical demonstrated reliability (ICC = 0.92) and validity (r = 0.81). Thresholds demonstrated sensitivity (91%), specificity (84%), kappa = 0.73 (p = 0.043), area under curve range = 0.81-0.97. In the "free-living study," 99.6% of participants wore the accelerometer; 84.1% had complete/valid data (mean = 5.7 days). Primary reasons for missing/invalid data included: improper programming/documentation (5.2%), failure to return device (5.0%), and wear-time = 2 days (2.8%). The moderate-to-vigorous physical activity threshold (> 3,200 counts/minute) yielded 37.2 min/day, 2 to 4.5 times lower than that of the manufacturer's software (effect size = 0.74-4.05). Conclusions: Validity, reliability, and feasibility evidences support Actical ankle accelerometry to assess physical activity in community studies of adolescent girls. When comparing manufacturers' software versus new thresholds, a major difference was observed.
Descriptors: Physical Activities, Physical Activity Level, Females, Adolescents, Measurement Equipment, Measurement Techniques, Validity, Reliability, Low Income Groups, Urban Areas, Grade 6, Grade 7, Metabolism, Comparative Analysis, African American Students, Middle School Students
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Publication Type: Journal Articles; Reports - Research
Education Level: Grade 6; Intermediate Grades; Middle Schools; Elementary Education; Grade 7; Junior High Schools; Secondary Education
Sponsor: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (NIH); Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) (NIH)
Authoring Institution: N/A
Identifiers - Location: Maryland
Grant or Contract Numbers: P30DK072488|R01HD054727