
Exposure to elevated levels of air pollutants is associated with bone damage in postmenopausal women, according to a new study that said the effects were most evident on the lumbar spine. High levels of niitrogen oxides in air nearly doubled the effects of normal aging on bone density in the spine, said researchers from Columbia University’s Mailman School of Public Health in New York City. This study was the first to explore the effects of air pollution mixtures on bone outcomes, researchers said. It also was the first to explore the connection between air pollution and bone mineral density in postmenopausal women. The researchers analyzed data from an ethnically diverse population of 161,000 postmenopausal women in a long-running U.S. women’s health study. To estimate levels of exposure to pollutants, including PM10 (small air pollution particles), nitrogen monoxide, nitrogen dioxide and sulfur dioxide, researchers used participants’ home addresses. Traffic exhaust and emissions from power plants are major producers of nitrogen oxides. Bone density was measured at enrollment in the study and after one, three and six years using dual-energy X-ray absorptiometry commonly known as a DEXA scan. The scans included whole-body, total hip, femoral neck and lumbar spine. Researchers said the magnitude of the effects of nitrogen oxides on lumbar spine density would amount to 1.22% annual losses. That’s nearly double the annual effect of age… read on > read on >