Department of Exercise and Wellness, Arizona State University East, Mesa, AZ
Due to Hurricane Zeta affecting our area, shipping will be delayed on Wednesday, October 28th. Our office will remain open, and we expect to resume normal operations on Thursday, October 29th. If you need immediate assistance, please contact us by email at firstname.lastname@example.org and we will respond as quickly as possible. Thank you for your continued support.
Comparison of Pedometer and Accelerometer Measures of Free-Living Physical Activity
- Published on 2002
The purpose of this investigation was 1) to evaluate agreement between dual-mode CSA accelerometer outputs and Yamax pedometer outputs assessed concurrently under free-living conditions; 2) to determine the relationship between pedometer-steps per day and CSA-time spent in inactivity and in light-, moderate-, and vigorous-intensity activities; and 3) to identify a value of pedometer-steps per day that corresponds with a minimum of 30 CSA-min·d-1 of moderate ambulatory activity.
Data were analyzed from 52 participants (27 men, 25 women; mean age = 38.2 +/- 12.0 yr; mean BMI = 26.4 +/- 4.5 kg·m-2) who were enrolled in the International Physical Activity Questionnaire study and wore both motion sensors during waking hours for 7 consecutive days.
Participants averaged 415.0+/-159.5 CSA-counts·min-1·d-1, 357,601 +/- 138,425 CSA-counts·d-1, 11,483 +/- 3,856 CSA-steps·d-1, and 9,638 +/- 4,030 pedometer-steps·d-1. There was a strong relationship between all CSA outputs and pedometer outputs (r = 0.74-0.86). The mean difference in steps detected between instruments was 1845+/-2116 steps·d-1 (CSA > pedometer; t = 6.29, P < 0.0001). There were distinct differences (effect sizes >0.80) in mean CSA-time (min·d-1) in moderate and vigorous activity with increasing pedometer-determined activity quartiles; no differences were noted for inactivity or light activity. Approximately 33 CSA-min·d-1 of moderate activity corresponded with 8000 pedometer-steps·d-1.
Differences in mean steps per day detected may be due to differences in set instrument sensitivity thresholds and/or attachment. Additional studies with different populations are needed to confirm a recommended number of steps per day associated with the duration and intensity of public health recommendations for ambulatory activity.
Link to Abstract: http://www.ncbi.nlm.nih.gov/pubmed/12471314
- Catrine Tudor-Locke
- Barbara E. Ainsworth
- Raymond W. Thompson
Prevention Research Center, Norman J. Arnold School of Public Health and Departments of Epidemiology and Biostatistics and Exercise Science, University of South Carolina, Columbia, SC
Medicine & Science in Sports & Exercise