An assessment of self-reported physical activity instruments in young people for population surveillance: Project ALPHA

• मुख्य लेखकों: Pearson Natalie (लेखक), Gorely Trish (लेखक), Biddle Stuart JH (लेखक), Bull Fiona C (लेखक)
• स्वरूप: पुस्तक
• प्रकाशित: BMC, 2011-01-01T00:00:00Z.
• विषय: article
• ऑनलाइन पहुंच: Connect to this object online.

<p>Abstract</p> <p>Background</p> <p>The assessment of physical activity is an essential part of understanding patterns and influences of behaviour, designing interventions, and undertaking population surveillance and monitoring, but it is particularly problematic when...