Calibration of the Computer Science and Applications, Inc. accelerometer

Freedson, Patty S.; Melanson, Edward L.; Sirard, John R.

doi:10.1097/00005768-199805000-00021

Cited by 3,304 publications

(3,068 citation statements)

References 8 publications

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“…Published cutpoints were used to examine the correlation between activity counts and self-report activity subdivided into low intensity and moderate-intensity activity and above. No women fell within the moderate-intensity activity category on any occasion using the cut points of X574 (Swartz et al, 2000) and X1952 (Freedson et al 1998). Only the lower cut point of X191 (Hendelman et al, 2000) identified individuals with activity of moderate intensity or above.…”

Section: Resultsmentioning

confidence: 99%

Significant changes in physical activity among pregnant women in the UK as assessed by accelerometry and self-reported activity

2005

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Objective: Research on the impact of maternal physical activity on pregnancy outcomes has often employed subjective measures of physical activity obtained by diary or questionnaire. This study investigates the feasibility of using accelerometry as an objective measure of physical activity of pregnant women compared with subjective data obtained via activity recall among pregnant women. Design: Activity data were collected prospectively on 57 women at 12, 16, 25, 34 and 38 weeks of gestation. Total daily physical activity was assessed by ambulatory accelerometer and activity interview (self-report). Maternal personality variables (health value, extroversion) were assessed by established scales. Setting: Leicestershire, UK. Subjects: Pregnant women were recruited by voluntary participation via antenatal booking clinics. In all, 64 pregnant women with low-risk pregnancy were enrolled onto the study, of whom 57 completed the study. Results: Mean 24 h physical activity levels (PAL) decreased significantly from second to third trimester as assessed by self-report interview (1.51-1.29 Metabolic Equivalent TEE-h/day, Po0.01) and accelerometry (200.05-147.42 counts/min, Po0.01). The correlation between the two measures declined as pregnancy progressed (r value ranging from 0.55 to 0.08). Compliance with the accelerometers declined from 90% at 12 weeks to 47% at 34 weeks (Po0.01). Compliance with the self-report interviews was 100%. Those who fully complied with the accelerometry demonstrated a significantly higher health value (Po0.05) and a significantly greater level of extroversion (Po0.05) than those who did not. Conclusions: Accelerometers and self-reported activity interviews both indicated a significant decline in PAL during pregnancy. Although subjects showed a willingness to use both methods, accelerometers resulted in variable compliance with 72 h monitoring. Both techniques may be limited by the need to measure low levels of physical activity during the third trimester. Sponsorship: Cambridge Neurotechnology Ltd, UK, assisted with the provision of Actiwatch accelerometers.

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Section: Resultsmentioning

confidence: 99%

Significant changes in physical activity among pregnant women in the UK as assessed by accelerometry and self-reported activity

2005

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“…(21, 48) The following cut-points and the corresponding thresholds were used: sedentary (0–100 counts/min), light (100–2199 counts/min), moderate (2200 – 5099 counts/min) and vigorous (>5100 counts/min). Missing values were estimated for children who had at least two days of eight hours of accelerometer wear time, using a sex-specific multiple imputation technique via PROC MI in SAS (Version 9.0, SAS Institute, Inc., Rockville, MD).…”

Section: Methodsmentioning

confidence: 99%

Perceptions of the Neighborhood Environment and Children’s Afterschool Moderate-to-Vigorous Physical Activity

McDonald

Dowda

Colabianchi

et al. 2015

Pediatric Exercise Science

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Previous research suggests the neighborhood environment may be an important influence on children’s physical activity (PA) behaviors; however, findings are inconsistent. The purpose of this study was to further understand the relationship between perceptions of the neighborhood environment and children’s afterschool moderate-to-vigorous PA (MVPA). Utilizing a structural equation modeling technique, we tested a conceptual model linking parent and child perceptions of the neighborhood environment, parent support for PA, and child outdoor PA with children’s afterschool MVPA. We found that child perception of the neighborhood environment and outdoor PA were positively associated with afterschool MVPA. In addition, parent support for PA positively influenced children’s outdoor PA. The neighborhood environment and outdoor activity appear to play an influential role on children’s afterschool PA behaviors.

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“…Participants were required to accumulate at least 10 h of physical activity per day, for a total of 4 days, to be eligible for further analysis. Physical activity of 100-1951 counts per minute (CPM) was classified as light, and ≥ 1952 CPM was classified as moderate to very vigorous, in accordance with previous studies [17,18]. Total counts from the three axes of the accelerometer were combined and divided by total wear time to generate a standardized measure of physical activity.…”

Section: Objective Measurement Of Physical Activitymentioning

confidence: 86%

Dairy product intake and bone properties in 70-year-old men and women

et al. 2018

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Summary In the present population-based study including 70-year-old men and women, total dairy product intake was associated with a weak positive association with tibia trabecular and cortical cross-sectional areas. Purpose Milk consumption has recently been suggested to increase fracture risk. Therefore, we aimed to investigate associations between dairy product consumption and peripheral bone properties. Furthermore, we explored whether consumption of milk and fermented dairy products affected bone properties differently. Methods The Healthy Aging Initiative is a population-based, cross-sectional study investigating the health of 70-year-old men and women. Out of the 2904 individuals who met the inclusion criteria, data on self-reported daily dairy product consumption (dl/ day), peripheral quantitative computed tomography (pQCT) examinations at the 4 and 66% scan sites of the tibia and radius, and dual-energy X-ray absorptiometry (DXA) scans were collected from 2040 participants. Associations between dairy product consumption and bone properties were examined using multiple linear regression models adjusted for sex, muscle area, meal size, dietary protein proportion, current smoking status, and objectively measured physical activity. Results Total dairy product intake was associated with larger trabecular (2.296 (95% CI, 0.552-4.039) mm 2 , per dl/day increase, p = 0.01) and cortical cross-sectional areas (CSAs) in the tibia (1.757 (95% CI, 0.683-2.830 mm 2 , p = 0.001) as measured by pQCT and higher areal bone mineral density (aBMD) of the radius (3.231 (95% CI, 0.764-5.698) mg/cm 2 , p = 0.01) as measured by DXA. No other measurement in the tibia, radius, femoral neck, or lower spine was associated significantly with dairy product intake. Bone properties did not differ according to the type of dairy product consumed. Conclusion No evidence of a negative association between dairy product consumption and bone health was found. Furthermore, total dairy product consumption was associated with increased CSAs in the tibia, regardless of dairy product type. Collectively, our findings indicate the existence of a weak but significant positive association between dairy product consumption bone properties in older adults.

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Calibration of the Computer Science and Applications, Inc. accelerometer

Abstract: These data provide a template on which patterns of activity can be classified into intensity levels using the CSA accelerometer.

Cited by 3,304 publications

References 8 publications

Significant changes in physical activity among pregnant women in the UK as assessed by accelerometry and self-reported activity

Significant changes in physical activity among pregnant women in the UK as assessed by accelerometry and self-reported activity

Perceptions of the Neighborhood Environment and Children’s Afterschool Moderate-to-Vigorous Physical Activity

Dairy product intake and bone properties in 70-year-old men and women

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