Journal of intellectual disability research : JIDR · 2025
Accelerometer Output and Oxygen Uptake in Adults With and Without Down Syndrome: METs vs. Percent VO2Reserve.
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Agiovlasitis S, Ballenger B K, Choi P, Haider M, Du Q, Motl R W
Аннотация
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.
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.