What question did this study set out to answer?

To evaluate the validity of the GT1M uniaxial and GT3X triaxial Actigraph accelerometers against oxygen consumption during walking and running in laboratory conditions.

November 26, 2013BMC Medical PhysicsOpen Access

Validity of actigraphs uniaxial and triaxial accelerometers for assessment of physical activity in adults in laboratory conditions

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Authors

LKLouise A. KellyCalifornia Lutheran University DMDuncan GE McMillanEM Photonics (United States)AAAlexandra M. AndersonSmithsonian Conservation Biology Institute

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Implication

Validation study reveals strong correlations between accelerometer counts and oxygen uptake in young adults, indicating both uniaxial and triaxial devices reliably assess physical activity.

Key Points

To evaluate the validity of the GT1M uniaxial and GT3X triaxial Actigraph accelerometers against oxygen consumption during walking and running in laboratory conditions.
Forty-two college-aged participants (18–25 years) wore GT1M and GT3X accelerometers on their right hip while exercising on a treadmill at 4.8 km/h, 6.4 km/h, and 9.7 km/h.
Oxygen consumption (VO2) was recorded minute-by-minute using an indirect calorimetry metabolic system alongside device-measured activity counts per minute.
Agreement and criterion validity were analyzed using Bland-Altman plots and correlation coefficients.
Bland-Altman analysis demonstrated systematic bias between monitor counts of 2814.4 cpm (limits: 1211.3 to 4417.4) at 4.8 km/h, 3713.6 cpm (limits: 1573.2 to 5854.0) at 6.4 km/h, and -3811.2 cpm (limits: 842.1 to 6780.3) at 9.7 km/h.
Counts per minute for both devices significantly correlated with oxygen consumption across treadmill intensities (GT1M: r = 0.881, p < 0.001; GT3X: r = 0.810, p < 0.001).

Cite This Study

Kelly et al. (2013) studied this question.

synapsesocial.com/papers/6a1d2628c1a3b75cd0d00a30 https://doi.org/10.1186/1756-6649-13-5

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Implication

Validation study reveals strong correlations between accelerometer counts and oxygen uptake in young adults, indicating both uniaxial and triaxial devices reliably assess physical activity.

Validity of actigraphs uniaxial and triaxial accelerometers for assessment of physical activity in adults in laboratory conditions

Discussion

Member takes

Implication

Key Points

Cite This Study

Validity of actigraphs uniaxial and triaxial accelerometers for assessment of physical activity in adults in laboratory conditions

Discussion

Member takes

Implication

Key Points

Cite This Study

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