title: Evaluation of the MyWellness Key accelerometer.
abstract: OBJECTIVE
  to examine the concurrent validity of the Technogym MyWellness Key accelerometer against objective and subjective physical activity (PA) measures.
  
  
  METHODS
  randomised, cross-sectional design with two phases. The laboratory phase compared the MyWellness Key with the ActiGraph GT1M and the Yamax SW200 Digiwalker pedometer during graded treadmill walking, increasing speed each minute. The free-living phase compared the MyWellness Key with the ActiGraph, Digiwalker, Bouchard Activity cord (BAR) and Global Physical Activity Questionnaire (GPAQ) for seven continuous days. Data were analysed using Spearman rank-order correlation coefficients for all comparisons.
  
  
  METHODS
  laboratory and free-living phases.
  
  
  METHODS
  sixteen participants randomly stratified from 41 eligible respondents by sex (n=8 men; n=8 women) and PA levels (n=4 low, n=8 middle and n=4 high active).
  
  
  RESULTS
  there was a strong association between the MyWellness Key and the ActiGraph accelerometer during controlled graded treadmill walking (r=0.91, p<0.01) and in free-living settings (r=0.73-0.76 for light to vigorous PA, respectively, p<0.01). No associations were observed between the MyWellness Key and the BAR and GPAQ (p>0.05).
  
  
  CONCLUSIONS
  the MyWellness Key has a high concurrent validity with the ActiGraph accelerometer to detect PA in both controlled laboratory and free-living settings.
authors.affiliation: Healthy Lifestyles Research Center, Program in Exercise and Wellness, College of Nursing and Health Innovation, Arizona State University, 7350 E. Unity Avenue, Mesa, AZ 85212, USA. stephen.herrmann@asu.edu
authors.forename: S D
authors.initials: SD
authors.lastname: Herrmann
authors.forename: T L
authors.initials: TL
authors.lastname: Hart
authors.forename: C D
authors.initials: CD
authors.lastname: Lee
authors.forename: B E
authors.initials: BE
authors.lastname: Ainsworth
mesh_terms: D000054:Acceleration; D000328:Adult; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D003430:Cross-Sectional Studies; D004867:Equipment Design; D015444:Exercise / Q000502:physiology*; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D011795:Surveys and Questionnaires; D016138:Walking / Q000502:physiology; D055815:Young Adult