The utility of the Digi-Walker step counter to assess daily physical activity patterns

Purpose: The Digi-Walker step counter is a promising and cost-effective too l to measure physical activity under free-living conditions. Two specific s tudies were conducted to evaluate the number of steps required to meet curr ent physical activity guidelines. Methods: Thirty-one adults (17 men, 14 wo men) served as participants. In study 1, we determined the number of steps to complete a mile under two different conditions and three paces. In study 2, we conducted a field trial to examine the relationship between daily st ep counts and other indices of physical activity. Participants in this stud y wore a Digi-Walker for 2 consecutive weeks and completed the 7-d physical activity recall (PAR) after each week. Results: In study 1, there were no differences in step counts by site, but steps were inversely related to pac e, with values ranging from 1330 to 1996. Individual step counts at a speci fic pace were negatively correlated with height, weight, leg length, and st ride length and were positively correlated with body fatness. In study 2, p articipants had average daily step counts of 11,603 when structured vigorou s activity was included and 8265 when only light and moderate activity were measured. Modest correlations were found between step counts and estimated energy expenditure. Similar correlations were observed when step counts we re related to minutes of activity per day and minutes of sitting per day. C onclusions: Pedometers provide a useful indicator of dairy step counts but variability in activity patterns make it difficult to establish step count guidelines that correspond with other public health guidelines.