Measures of Physical Activity Using Cell Phones: Validation Using Criterion Methods
Background Physical activity is associated with reduced risks of many chronic diseases. Data collected on physical activity in large epidemiological studies is often based on paper questionnaires. The validity of these questionnaires is debated, and more effective methods are needed. Obj...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
JMIR Publications
2010-01-01
|
| Series: | Journal of Medical Internet Research |
| Online Access: | http://www.jmir.org/2010/1/e2/ |