Key result
A prediction model using actigraphy and heart rate measurements highly correlated with measured oxygen consumption, with hip placement (R2 = 0.842) being more favorable than wrist (R2 = 0.822).
Why the study?
Does the use of an octagonal actigraph in conjunction with heart rate measurements accurately predict metabolic rate in young healthy volunteers during free-living activities?
Observational (n=20)
Does the use of an octagonal actigraph in conjunction with heart rate measurements accurately predict metabolic rate in young healthy volunteers during free-living activities?
Effect estimate: R2 = 0.842 (hip); R2 = 0.822 (wrist)
A prediction model combining actigraphy and heart rate measurements accurately estimates oxygen consumption during free-living activities, with hip placement being more favorable than wrist.
Actigraph-HR combination may estimate metabolic rate in field settings; leaves open validation for injury-risk prediction in military cohorts.
PURPOSE: In military scenarios, there is a need for a system that can enable identification of possible future injury during different activities that are considered to be physically strenuous. The purpose of the present study was to determine whether the use of an octagonal actigraph in conjunction with heart rate (fc) measurements could serve as an accurate method for metabolic rate estimation for different free-living activities in field settings. METHODS: Twenty young healthy volunteers (10 men, 22 +/- 3 years of age, and 10 women, 23 +/- 3 years of age) participated in this study. All participants were exposed to six different activities (walking, running, sweeping, climbing and descending stairs, and shopping). Continuous actigraphic measurements were collected from the hip and wrist, fc was monitored with a Polar chest belt, and oxygen consumption (VO2) was measured with a K4b2 system. RESULTS: A prediction model for VO2 was constructed from actigraphic and fc measurements. Comparisons between predicted and measured VO2 values revealed high correlations (hip, R2 = 0.842; wrist, R2 = 0.822). CONCLUSIONS: This new prediction model highly correlated with VO2 measurements. The hip was found to be more favorable than the wrist for assessment of VO2 for different free-living activities.
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Berlin et al. (2007) conducted an observational in Healthy (n=20). Actigraphy and heart rate measurements vs. Measured oxygen consumption (VO2) was evaluated on Correlation between predicted and measured VO2 values (R2 = 0.842 (hip); R2 = 0.822 (wrist)). A prediction model using actigraphy and heart rate measurements highly correlated with measured oxygen consumption, with hip placement (R2 = 0.842) being more favorable than wrist (R2 = 0.822).
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