Assessment of prescribed increases in physical activity: application of a new method for microprocessor analysis of heart rate |
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| Authors: | J K Mueller D Gossard F R Adams C B Taylor W L Haskell H C Kraemer D K Ahn K Burnett R F DeBusk |
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| Affiliation: | 1. Integrated Research and Treatment Center (IFB) for AdiposityDiseases, University of Leipzig, Germany;2. Department of Pediatrics, University Hospital of Halle-Wittenberg, Halle, Germany;3. University of Oslo, Institute of Clinical Medicine, Section for Clinical Molecular Biology, Akershus University Hospital, Oslo, Norway;4. Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig, Leipzig, Germany;5. Clinical Trial Centre, University of Leipzig, Leipzig, Germany |
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| Abstract: | A portable solid-state recorder-display system was used to measure and analyze heart rate during the waking hours of 3 consecutive days in free-living sedentary normal middle-aged men who were randomized to undergo 3 regimens of physical activity during a 12-week period: low-intensity exercise training at home (n = 21), high-intensity exercise training at home (n = 23) and customary activity (n = 20). This was done to determine whether the system could detect changes in heart rate and, indirectly, in physical activity within the 3 groups. In both training groups the percentage of total recorded time spent within the prescribed high or low heart rate range recorded at 6 or 12 weeks increased significantly (p less than 0.05), whereas control subjects showed no increase above baseline values. Peak oxygen consumption increased by 8% and 17% in men undergoing low- and high-intensity training, whereas in control subjects it did not change. This solid-state system reliably measures prescribed increases in heart rate and provides an indirect measure of physical activity in normal sedentary men undergoing exercise training at home. |
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