tailieunhanh - Báo cáo y học: " Validity of estimating minute-by-minute energy expenditure of continuous walking bouts by accelerometry"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: Validity of estimating minute-by-minute energy expenditure of continuous walking bouts by accelerometry. | Kuffel et al. International Journal of Behavioral Nutrition and Physical Activity 2011 8 92 http content 8 1 92 INTERNATIONAL JOURNAL OF BEHAVIORAL NUTRITION AND PHYSICAL ACTIVITY RESEARCH Open Access Validity of estimating minute-by-minute energy expenditure of continuous walking bouts by accelerometry t c I I iff I 1C c r I A2 I I ì I_I -A r 3 c . A -A A d A c r A I I I A A4 d I Ì A A n D D A rr Arr I r5 Elin E Kurrel Scott E Crouter Jere D Haas toward A rionyiiio ano David R Bassett Jr Abstract Background Objective measurement of physical activity remains an important challenge. For wearable monitors such as accelerometer-based physical activity monitors more accurate methods are needed to convert activity counts into energy expenditure EE . Purpose The purpose of this study was to examine the accuracy of the refined Crouter 2-Regression Model C2RM for estimating EE during the transition from rest to walking and walking to rest. A secondary purpose was to determine the extent of overestimation in minute-by-minute EE between the refined C2RM and the 2006 C2RM. Methods Thirty volunteers age 28 yrs performed 15 minutes of seated rest 8 minutes of over-ground walking and 8 minutes of seated rest. An ActiGraph GT1M accelerometer and Cosmed K4b2 portable metabolic system were worn during all activities. Participants were randomly assigned to start the walking bout at 0 20 or 40 s into the minute according to the ActiGraph clock . Acceleration data were analyzed by two methods 2006 Crouter model and a new refined model. Results The 2006 Crouter 2-Regression model over-predicted measured kcal kg-1 hr-1 during the first and last transitional minutes of the 20-s and 40-s walking conditions P . It also over-predicted the average EE for a walking bout kcal kg-1 hr-1 compared to both the measured kcal kg-1 hr-1 kcal kg-1 hr-1 and the refined Crouter model kcal kg-1 hr-1 P . Conclusion The 2006 Crouter 2-regression model .