Abstract：
BACKGROUND:Walking is a widely used approach to increase physical activity levels in obese patients. In this paper, we investigate the precision and accuracy of an ankle-worn dual-axis accelerometer (Stepwatch) and investigate its potential application as a predictor of energy expenditure. METHODS:Twenty healthy subjects (10 lean, 10 obese) wore spring-levered (Accusplit), piezoelectric (Omron HF-100), and Stepwatch pedometers. Subjects walked on a treadmill at 1, 2, and 3 mph and in a hallway at 1 and 1.85 mph, during which energy expenditure was measured. RESULTS:The Stepwatch counted 99.7 +/- 0.67% (mean +/- SEM) of the manual counts. In comparison, the Omron pedometer counted 61 +/- 3.3% and the Accusplit counted 26 +/- 2.8% of the manual counts at 1 mph although all pedometers were accurate (> 98% of counts) at 3 mph. In repeated measures, the Stepwatch produced negligible variance (SD = 0.36) over all speed whereas the other pedometers showed a large amount of variance at all speed (SD = 4-13). Stepwatch counts were predictive of walking energy expenditure corrected by weight (r2 > 0.8). CONCLUSION:The counts from the Stepwatch were virtually identical to the manual counts from a trained investigator and provided a reliable predictor of walking energy expenditure.
journal_name
Prev Medjournal_title
Preventive medicineauthors
Foster RC,Lanningham-Foster LM,Manohar C,McCrady SK,Nysse LJ,Kaufman KR,Padgett DJ,Levine JAdoi
10.1016/j.ypmed.2005.07.006subject
Has Abstractpub_date
2005-09-01 00:00:00pages
778-83issue
3-4eissn
0091-7435issn
1096-0260pii
S0091-7435(05)00109-Xjournal_volume
41pub_type
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journal_title：Preventive medicine
pub_type： 临床试验,杂志文章,随机对照试验
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journal_title：Preventive medicine
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pub_type： 临床试验,杂志文章,随机对照试验
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