Moderate Intense Physical Activity Depends on Selected Metabolic Equivalent of Task (MET) Cut-Off and Type of Data Analysis

摘要: Background Accelerometry data are frequently analyzed without considering whether moderate-to-vigorous physical activities (MVPA) were performed in bouts of >10 minutes as defined most activity guidelines. We aimed i) to quantify MVPA by using different commonly-applied guidelines, ii) investigate the effect versus non-bouts analysis, and iii) propose validate a cut-point classify (in-) active subjects. Methods Healthy subjects (n=110;62±6yrs) patients with Chronic Obstructive Pulmonary Disease (COPD) (n=113;62±5yrs) wore an monitor for 7 days. Three Metabolic Equivalent Task (MET) cut-offs one individual target (50% VO2 reserve) used define MVPA. First, all summed up (NON-BOUTS). Secondly, only continuous counted (BOUTS). Receiver operating characteristic (ROC) curve analyses (cross-) new non-bout cut-points based on criterion 30 per day Likelihood ratios (sensitivity/[1-specificity]) express association between proposed bout min*day-1. Results MVPA was variable across guidelines lowest values age-specific cut-offs. Selecting METs corresponding 50% reserve revealed no differences groups. MVPA’s BOUTS healthy 2 4 fold lower than NON-BOUTS this even 3 12 COPD. The 80 min*day-1 threshold delivered positive likelihood 5.1[1.5-19.6] (healthy subjects) 2.3[1.6-3.3] (COPD). Conclusion varies upon selected guideline/targets analysis. Accelerometry measured min*day-1, threshold, is associated commonly-used min*day-1.