S Agiovlasitis, B K Ballenger, P Choi, M Haider, Q Du, R W Motl
{"title":"有和没有唐氏综合症的成年人的加速度计输出和氧摄取：METs与VO2Reserve百分比。","authors":"S Agiovlasitis, B K Ballenger, P Choi, M Haider, Q Du, R W Motl","doi":"10.1111/jir.13253","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>The estimation of physical activity (PA) and sedentary behaviour with accelerometers is typically based on the relationship between accelerometer output and metabolic equivalents (METs)-an index of PA intensity. But for adults with Down syndrome (DS), PA intensity may be better reflected in the percent oxygen uptake reserve (%VO<sub>2Reserve</sub>), as it accounts for their lower aerobic fitness. This study examined if the relationship between accelerometer output and METs or %VO<sub>2Reserve</sub> across various PAs and sedentary behaviours differs between adults with and without DS.</p><p><strong>Methods: </strong>Forty-one adults with DS (age 35 ± 9 years; 18 women) and 41 adults without DS (age 24 ± 5 years; 18 women) performed 17 tasks of varying intensity. We estimated aerobic fitness with a submaximal treadmill test. We measured oxygen uptake with portable calorimetry and expressed it as METs and %VO<sub>2Reserve</sub>. Output from triaxial accelerometers on the nondominant hip and wrist was determined as Vector Magnitude (VM). We used multilevel modelling to evaluate the relationships of METs or %VO<sub>2Reserve</sub> with VM, controlling for body mass index (BMI) and age.</p><p><strong>Results: </strong>For the hip accelerometer, VM and the group-by-VM interaction significantly predicted METs (p < 0.001; conditional R<sup>2</sup> = 0.82), but between-group differences were small. For the wrist accelerometer, VM and age significantly predicted METs (p < 0.035; conditional R<sup>2</sup> = 0.76). For both the hip and the wrist accelerometer, VM, the group-by-VM interaction and BMI significantly predicted %VO<sub>2Reserve</sub> (p ≤ 0.047; conditional R<sup>2</sup> = 0.82 and 0.74, respectively). Between-group differences in the response to VM were larger for VO<sub>2Reserve</sub> than METs models.</p><p><strong>Conclusion: </strong>The relationship between accelerometer output and %VO<sub>2Reserve</sub> across PAs and sedentary behaviours is different between adults with and without DS. Calibrating accelerometer output against %VO<sub>2Reserve</sub> may be preferable to METs.</p>","PeriodicalId":16163,"journal":{"name":"Journal of Intellectual Disability Research","volume":" ","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Accelerometer Output and Oxygen Uptake in Adults With and Without Down Syndrome: METs vs. Percent VO<sub>2Reserve</sub>.\",\"authors\":\"S Agiovlasitis, B K Ballenger, P Choi, M Haider, Q Du, R W Motl\",\"doi\":\"10.1111/jir.13253\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Background: </strong>The estimation of physical activity (PA) and sedentary behaviour with accelerometers is typically based on the relationship between accelerometer output and metabolic equivalents (METs)-an index of PA intensity. But for adults with Down syndrome (DS), PA intensity may be better reflected in the percent oxygen uptake reserve (%VO<sub>2Reserve</sub>), as it accounts for their lower aerobic fitness. This study examined if the relationship between accelerometer output and METs or %VO<sub>2Reserve</sub> across various PAs and sedentary behaviours differs between adults with and without DS.</p><p><strong>Methods: </strong>Forty-one adults with DS (age 35 ± 9 years; 18 women) and 41 adults without DS (age 24 ± 5 years; 18 women) performed 17 tasks of varying intensity. We estimated aerobic fitness with a submaximal treadmill test. We measured oxygen uptake with portable calorimetry and expressed it as METs and %VO<sub>2Reserve</sub>. Output from triaxial accelerometers on the nondominant hip and wrist was determined as Vector Magnitude (VM). We used multilevel modelling to evaluate the relationships of METs or %VO<sub>2Reserve</sub> with VM, controlling for body mass index (BMI) and age.</p><p><strong>Results: </strong>For the hip accelerometer, VM and the group-by-VM interaction significantly predicted METs (p < 0.001; conditional R<sup>2</sup> = 0.82), but between-group differences were small. For the wrist accelerometer, VM and age significantly predicted METs (p < 0.035; conditional R<sup>2</sup> = 0.76). For both the hip and the wrist accelerometer, VM, the group-by-VM interaction and BMI significantly predicted %VO<sub>2Reserve</sub> (p ≤ 0.047; conditional R<sup>2</sup> = 0.82 and 0.74, respectively). Between-group differences in the response to VM were larger for VO<sub>2Reserve</sub> than METs models.</p><p><strong>Conclusion: </strong>The relationship between accelerometer output and %VO<sub>2Reserve</sub> across PAs and sedentary behaviours is different between adults with and without DS. Calibrating accelerometer output against %VO<sub>2Reserve</sub> may be preferable to METs.</p>\",\"PeriodicalId\":16163,\"journal\":{\"name\":\"Journal of Intellectual Disability Research\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":2.1000,\"publicationDate\":\"2025-05-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Intellectual Disability Research\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1111/jir.13253\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"EDUCATION, SPECIAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Intellectual Disability Research","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1111/jir.13253","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"EDUCATION, SPECIAL","Score":null,"Total":0}
Accelerometer Output and Oxygen Uptake in Adults With and Without Down Syndrome: METs vs. Percent VO2Reserve.
Background: The estimation of physical activity (PA) and sedentary behaviour with accelerometers is typically based on the relationship between accelerometer output and metabolic equivalents (METs)-an index of PA intensity. But for adults with Down syndrome (DS), PA intensity may be better reflected in the percent oxygen uptake reserve (%VO2Reserve), as it accounts for their lower aerobic fitness. This study examined if the relationship between accelerometer output and METs or %VO2Reserve across various PAs and sedentary behaviours differs between adults with and without DS.
Methods: Forty-one adults with DS (age 35 ± 9 years; 18 women) and 41 adults without DS (age 24 ± 5 years; 18 women) performed 17 tasks of varying intensity. We estimated aerobic fitness with a submaximal treadmill test. We measured oxygen uptake with portable calorimetry and expressed it as METs and %VO2Reserve. Output from triaxial accelerometers on the nondominant hip and wrist was determined as Vector Magnitude (VM). We used multilevel modelling to evaluate the relationships of METs or %VO2Reserve with VM, controlling for body mass index (BMI) and age.
Results: For the hip accelerometer, VM and the group-by-VM interaction significantly predicted METs (p < 0.001; conditional R2 = 0.82), but between-group differences were small. For the wrist accelerometer, VM and age significantly predicted METs (p < 0.035; conditional R2 = 0.76). For both the hip and the wrist accelerometer, VM, the group-by-VM interaction and BMI significantly predicted %VO2Reserve (p ≤ 0.047; conditional R2 = 0.82 and 0.74, respectively). Between-group differences in the response to VM were larger for VO2Reserve than METs models.
Conclusion: The relationship between accelerometer output and %VO2Reserve across PAs and sedentary behaviours is different between adults with and without DS. Calibrating accelerometer output against %VO2Reserve may be preferable to METs.
期刊介绍：
The Journal of Intellectual Disability Research is devoted exclusively to the scientific study of intellectual disability and publishes papers reporting original observations in this field. The subject matter is broad and includes, but is not restricted to, findings from biological, educational, genetic, medical, psychiatric, psychological and sociological studies, and ethical, philosophical, and legal contributions that increase knowledge on the treatment and prevention of intellectual disability and of associated impairments and disabilities, and/or inform public policy and practice. Expert reviews on themes in which recent research has produced notable advances will be included. Such reviews will normally be by invitation.
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