THE CHALLENGE OF ESTIMATING ENERGY EXPENDITURE FROM MOTION: A COMPARISON OF SEVERAL PHYSICAL ACTIVITY MONITORS
Physical activity (PA) monitors that estimate free-living energy expenditure (EE) are becoming increasingly popular among researchers and consumers. A study published in the November 2013 issue of Medicine & Science in Sports & Exercise® evaluated the ability of a novel shoe-based PA monitor to estimate EE; researchers also compared the performance of the shoe-based monitor with that of several research and consumer devices.
Seventeen healthy young subjects completed a 4-hour study visit in a room calorimeter while wearing the shoe-based device and five additional PA monitors (i.e., Actical, Actigraph, IDEEA, DirectLife, and Fitbit). The shoe-based device features insole pressure sensors and a heel-mounted accelerometer and is capable of classifying PA and estimating EE. Subjects completed a variety of activities (i.e., lying down, sitting, standing, walking at various speeds and grades, stepping, sweeping, cycling, and free living) whereas EE was estimated by each PA monitor and directly measured by the room calorimeter.
Average EE estimations from the shoe-based device DirectLife and IDEEA were not significantly different from EE measured by the room calorimeter (6.2%, 13.6%, and 17.5% difference, respectively). In contrast, average EE estimations from the Actical, Actigraph, and Fitbit were significantly lower than measured EE (25.9%, 26.8%, and 28.7% difference, respectively). Findings suggest that EE estimates across devices vary significantly from each other and, to varying degrees, from measured EE. Thus, although PA monitors are likely useful in detecting changes in EE across an intervention or lifestyle change, researchers and consumers should be cautioned against comparing findings across devices or using devices to report absolute EE.
DEVELOPING THE HEALTHY YOUTH ATHLETE
Innovation and Best Practices in Going the Distance caring for young athletes, from recreational to elite, spans many disciplines and topics. In February,ACSM and ESPN Wide World of Sports, along with an array of supporting organizations, will host “Developing the Healthy Youth Athlete: Innovation and Best Practices in Going the Distance,” a 2-day conference focused on redefining the youth sports model through interactive discussions.
Program topics include youth sports development, maturation and development, specialization, assessment/functional movement, sports nutrition, concussions, and youth Olympics. For more information, visit http://www.attendaconference.org/sportsseries/.
MARK YOUR CALENDAR FOR ACSM’S 2014 HEALTH & FITNESS SUMMIT & EXPOSITION
Before you know it, it will be time for ACSM’s Health & Fitness Summit & Exposition. Mark your calendars now for April 1–4, 2014. The 2014 Summit will be held in Atlanta, GA. Stay tuned to www.acsmsummit.org for more details.
APPLY FOR THE LAWRENCE A. GOLDING SCHOLARSHIP
The Lawrence A. Golding Scholarship is being offered for the ninth consecutive year. The scholarship is designed to publicly recognize undergraduate students who are in their sophomore, junior, or senior year, who have made important and meaningful contributions to their communities in the areas of health, fitness, and/or education.
ACSM will provide $500 to each winner, and Healthy LearningTM will provide $1,000 credit to be used in the ACSM store to purchase DVDs, books, or wearables. The recipients also receive complimentary registration to ACSM’s 2014 Health & Fitness Summit & Exposition to be held April 1–4, 2014 in Atlanta, GA. Visit www.acsmsummit.org to apply. The deadline is on November 8, 2013.