Avons, P.; Garthwaite, P. H.; Davies, H. L.; Murgatroyd, P. R. and James, W. P.
Approaches to estimating physical activity in the community: calorimetric validation of actometers and heart rate monitoring.
European Journal of Clinical Nutrition, 42(3) pp. 185–196.
The relationship between actometer measurements, heart rate monitoring and energy expenditure during exercise and resting periods was assessed in a whole-body indirect calorimeter on 12 young male volunteers. Equations derived from these studies were applied to actometer measurements taken during a further 7 d recording in free-living conditions to predict daily energy expenditure over 1 week on an individual basis. Actometers proved to be a satisfactory means of estimating energy expenditure and heart rate monitoring improved the estimates in a few selected subjects. Indirect measures of energy expenditure could be developed by this approach but individual calibration is essential.
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