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Vol. 84, Issue 1, 362-371, January 1998
School of Sport Health and Physical Education Sciences, University of Wales, Bangor, Gwynedd LL57 2EN, Wales, United Kingdom
Eston, Roger G., Ann V. Rowlands, and David K. Ingledew.
Validity of heart rate, pedometry, and accelerometry for
predicting the energy cost of children's activities.
J. Appl. Physiol. 84(1): 362-371, 1998.
Heart rate telemetry is frequently used to estimate daily
activity in children and to validate other methods. This study compared
the accuracy of heart rate monitoring, pedometry, triaxial
accelerometry, and uniaxial accelerometry for estimating oxygen
consumption during typical children's activities. Thirty Welsh
children (mean age 9.2 ± 0.8 yr) walked (4 and 6 km/h) and ran (8 and 10 km/h) on a treadmill, played catch, played hopscotch, and sat
and crayoned. Heart rate, body accelerations in three axes, pedometry
counts, and oxygen uptake were measured continuously during each 4-min
activity. Oxygen uptake was expressed as a ratio of body mass raised to
the power of 0.75 [scaled oxygen uptake (s
O2)]. All measures
correlated significantly (P < 0.001)
with sO2. A
multiple-regression equation that included triaxial accelerometry counts and heart rate predicted
sO2 better than any measure alone (R2 = 0.85, standard error of the estimate = 9.7 ml · kg
0.75 · min1).
The best of the single measures was triaxial accelerometry (R2 = 0.83, standard error of the estimate = 10.3 ml · kg0.75 · min1).
It is concluded that a triaxial accelerometer provides the best
assessment of activity. Pedometry offers potential for large population
studies.
physical activity; oxygen consumption; triaxial accelerometry; uniaxial accelerometry; heart rate monitoring
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