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ERIC Number: EJ1081408
Record Type: Journal
Publication Date: 2015
Pages: 9
Abstractor: As Provided
ISSN: ISSN-0270-1367
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.
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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
Audience: N/A
Language: English
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