background: . the aim of this study was to investigate of relationship of musculoskeletal symptoms with weight of backpack in tehran secondary school students. methods: this cross-sectional study was performed in the city of tehran in 2009. two hundred thirteen students partici­pated in study. nordic musculoskeletal questionnaire was used, asking about complaints of back, neck, and/or shoulders...

In this article, we provide an evidence-based review of pain beliefs and their influence on pain perception and response to treatment. We examine the nature of pain perception and the role of cognitive and emotional processes in the interpretation of pain signals, giving meaning to pain and shaping our response to it. We highlight three types of beliefs that have a particularly strong influence...

Introduction Chronic low back pain (LBP) is a major cause of disability; early diagnosis and stratification of care remain challenges. Objectives This article describes the development of a screening tool for the 1-year prognosis of patients with high chronic LBP risk (risk stratification index) and for treatment allocation according to treatment-modifiable yellow flag indicators (risk preven...

this study is aimed to identify sources of particulate matter with mean aerodynamic diameterbelow 10 μm (pm10) present in the atmosphere of the metropolitan area of mexico city (mamc), usingsamples obtained from january 1st to june 30th, 2009, analyzed with x-ray spectrometric techniques.minivol samplers were used to collect samples on polycarbonate filters in three sites (north, center, andsou...

this study is aimed to identify sources of particulate matter with mean aerodynamic diameterbelow 10 μm (pm10) present in the atmosphere of the metropolitan area of mexico city (mamc), usingsamples obtained from january 1st to june 30th, 2009, analyzed with x-ray spectrometric techniques.minivol samplers were used to collect samples on polycarbonate filters in three sites (north, center, andsou...

The aim of this analysis was to assess the impact of chronic back pain and psychological distress on the utilization of primary and secondary levels of care in the ambulatory health care sector in Austria - a country without a gatekeeping system. Additionally, we aimed to determine if the joint effect of chronic back pain and psychological distress was higher than the impact of the sum of the t...