The development and evaluation of a novel Internet-based computer program to assess previous-day dietary and physical activity behaviours in adults: the Synchronised Nutrition and Activity Program for Adults (SNAPA~(TM))

摘要

The Synchronised Nutrition and Activity Program for Adults (SNAPA~(TM)) was developed to address the need for accurate, reliable feasible inexpensive and low-burden methods for assessing specific dietary and physical activity behaviours in adults. Short-term test-retest reliability of SNAPA~(TM) was assessed in forty-four adults (age 41-4 (sd 17*3) years) who completed SNAPA~(TM) twice in 1.day. Concurrent validity against direct dietary observation and combined heart rate and accelerometry was assessed in seventy-seven adults (age 34-4 (sdII-1) years). Test—retest reliability revealed no substantial systematic shifts in mean values of the outcome variables： percentage of food energy from fat (%fat), number of portions of fruit and vegetables (FV)and minutes of moderate-to-vigorous physical activity (MVPA). For lunchtime dietary intake，the mean match rate between food items reported using SNAPA~(TM) and those observed was 81.7%, with a phantom rate of 5-6%. Pearson’s correlations between SNAPA~(TM) and the reference methods ranged from 0.27 to 0.56 for %fat, FV portions and minutes of MVPA. For %fat and FV intake, there was no fixed or proportional bias, and mean differences between the methods (SNAPA~(TM) 一 reference) were 5'1 % and 0 portions，respectively. For minutes of MVPA, a fixed bias of — 28 min was revealed when compared with all minutes of MVPA measured by combined heart rate and accelerometry, whereas a proportional bias (slope 1.47) was revealed when compared with minutes carried out in bouts > 10 min. SNAPA~(TM) is a promising tool for measuring specific energy balance behaviours, though further work is required to improve accuracy for physical activity behaviours.