RT Journal Article
SR Electronic
T1 Use of accelerometers for measuring consecutive bouts in physical activity recommendations
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP p2179
VO 38
IS Suppl 55
A1 Menno J. Zuidema
A1 Jorine E. Hartman
A1 Nick H.T. ten Hacken
A1 Matthieu H.G. de Greef
A1 Rob C. van Lummel
YR 2011
UL http://erj.ersjournals.com/content/38/Suppl_55/p2179.abstract
AB Background: Most recommendations for physical activity (PA) are based on subjective self reported measures, although performance-based accelerometers are already available for many years. To meet PA recommendations, subjects need to be physically active in bouts varying from 5 to 20 minutes. However, the influence of bout length and bout interruptions in objectively measured PA status is not exactly known.Aim: The aim of the present study is to investigate the effect of different consecutive bout lengths and bout interruptions on the PA status using accelerometers.Methods: Twenty COPD patients were selected from a larger dataset, based on a large range in PA level. The DynaPort accelerometer (100Hz, ±2g, McRoberts BV, The Hague, the Netherlands) was used for measuring PA during a full week of daily living. Systematically varied bout lengths and interruptions are investigated to examine PA status.Results: Bout length of 10 versus 1 minute shows a 71% difference in PA status (91 METs·min vs 317 METs·min) (figure 1a). Bout interruption duration of 0 vs 5 minutes shows a 57% difference in PA status (91 METs·min vs 214 METs·min) (figure 1b).Conclusion: This study shows that varying bout length and interruption duration has large impact on PA status. When applying PA recommendations this should be taken into account, particularly in subjects with a sedentary life style.